author | psandoz |
Mon, 12 Jun 2017 14:30:40 -0700 | |
changeset 45635 | 56b0672b0070 |
parent 45518 | 4a116dd82fb5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.misc; |
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import jdk.internal.vm.annotation.ForceInline; |
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import jdk.internal.misc.VM; |
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import jdk.internal.ref.Cleaner; |
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import jdk.internal.reflect.CallerSensitive; |
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import jdk.internal.reflect.Reflection; |
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import sun.nio.ch.DirectBuffer; |
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import java.lang.reflect.Field; |
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import java.security.ProtectionDomain; |
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/** |
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* A collection of methods for performing low-level, unsafe operations. |
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* Although the class and all methods are public, use of this class is |
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* limited because only trusted code can obtain instances of it. |
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* |
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* <em>Note:</em> It is the resposibility of the caller to make sure |
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* arguments are checked before methods of this class are |
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* called. While some rudimentary checks are performed on the input, |
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* the checks are best effort and when performance is an overriding |
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* priority, as when methods of this class are optimized by the |
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* runtime compiler, some or all checks (if any) may be elided. Hence, |
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* the caller must not rely on the checks and corresponding |
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* exceptions! |
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* |
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* @author John R. Rose |
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* @see #getUnsafe |
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*/ |
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public final class Unsafe { |
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static { |
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Reflection.registerMethodsToFilter(Unsafe.class, "getUnsafe"); |
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} |
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private Unsafe() {} |
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private static final Unsafe theUnsafe = new Unsafe(); |
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private static final jdk.internal.misc.Unsafe theInternalUnsafe = jdk.internal.misc.Unsafe.getUnsafe(); |
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/** |
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* Provides the caller with the capability of performing unsafe |
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* operations. |
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* |
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* <p>The returned {@code Unsafe} object should be carefully guarded |
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* by the caller, since it can be used to read and write data at arbitrary |
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* memory addresses. It must never be passed to untrusted code. |
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* |
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* <p>Most methods in this class are very low-level, and correspond to a |
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* small number of hardware instructions (on typical machines). Compilers |
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* are encouraged to optimize these methods accordingly. |
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* |
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* <p>Here is a suggested idiom for using unsafe operations: |
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* |
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* <pre> {@code |
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* class MyTrustedClass { |
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* private static final Unsafe unsafe = Unsafe.getUnsafe(); |
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* ... |
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* private long myCountAddress = ...; |
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* public int getCount() { return unsafe.getByte(myCountAddress); } |
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* }}</pre> |
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* |
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* (It may assist compilers to make the local variable {@code final}.) |
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* |
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* @throws SecurityException if the class loader of the caller |
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* class is not in the system domain in which all permissions |
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* are granted. |
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*/ |
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@CallerSensitive |
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public static Unsafe getUnsafe() { |
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Class<?> caller = Reflection.getCallerClass(); |
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if (!VM.isSystemDomainLoader(caller.getClassLoader())) |
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throw new SecurityException("Unsafe"); |
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return theUnsafe; |
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} |
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/// peek and poke operations |
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/// (compilers should optimize these to memory ops) |
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// These work on object fields in the Java heap. |
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// They will not work on elements of packed arrays. |
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/** |
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* Fetches a value from a given Java variable. |
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* More specifically, fetches a field or array element within the given |
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* object {@code o} at the given offset, or (if {@code o} is null) |
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* from the memory address whose numerical value is the given offset. |
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* <p> |
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* The results are undefined unless one of the following cases is true: |
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* <ul> |
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* <li>The offset was obtained from {@link #objectFieldOffset} on |
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* the {@link java.lang.reflect.Field} of some Java field and the object |
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* referred to by {@code o} is of a class compatible with that |
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* field's class. |
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* |
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* <li>The offset and object reference {@code o} (either null or |
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* non-null) were both obtained via {@link #staticFieldOffset} |
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* and {@link #staticFieldBase} (respectively) from the |
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* reflective {@link Field} representation of some Java field. |
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* |
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* <li>The object referred to by {@code o} is an array, and the offset |
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* is an integer of the form {@code B+N*S}, where {@code N} is |
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* a valid index into the array, and {@code B} and {@code S} are |
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* the values obtained by {@link #arrayBaseOffset} and {@link |
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* #arrayIndexScale} (respectively) from the array's class. The value |
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* referred to is the {@code N}<em>th</em> element of the array. |
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* |
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* </ul> |
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* <p> |
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* If one of the above cases is true, the call references a specific Java |
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* variable (field or array element). However, the results are undefined |
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* if that variable is not in fact of the type returned by this method. |
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* <p> |
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* This method refers to a variable by means of two parameters, and so |
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* it provides (in effect) a <em>double-register</em> addressing mode |
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* for Java variables. When the object reference is null, this method |
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* uses its offset as an absolute address. This is similar in operation |
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* to methods such as {@link #getInt(long)}, which provide (in effect) a |
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* <em>single-register</em> addressing mode for non-Java variables. |
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* However, because Java variables may have a different layout in memory |
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* from non-Java variables, programmers should not assume that these |
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* two addressing modes are ever equivalent. Also, programmers should |
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* remember that offsets from the double-register addressing mode cannot |
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* be portably confused with longs used in the single-register addressing |
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* mode. |
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* |
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* @param o Java heap object in which the variable resides, if any, else |
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* null |
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* @param offset indication of where the variable resides in a Java heap |
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* object, if any, else a memory address locating the variable |
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* statically |
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* @return the value fetched from the indicated Java variable |
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* @throws RuntimeException No defined exceptions are thrown, not even |
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* {@link NullPointerException} |
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*/ |
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@ForceInline |
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public int getInt(Object o, long offset) { |
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return theInternalUnsafe.getInt(o, offset); |
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} |
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/** |
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* Stores a value into a given Java variable. |
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* <p> |
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* The first two parameters are interpreted exactly as with |
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* {@link #getInt(Object, long)} to refer to a specific |
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* Java variable (field or array element). The given value |
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* is stored into that variable. |
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* <p> |
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* The variable must be of the same type as the method |
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* parameter {@code x}. |
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* |
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* @param o Java heap object in which the variable resides, if any, else |
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* null |
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* @param offset indication of where the variable resides in a Java heap |
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* object, if any, else a memory address locating the variable |
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* statically |
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* @param x the value to store into the indicated Java variable |
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* @throws RuntimeException No defined exceptions are thrown, not even |
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* {@link NullPointerException} |
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*/ |
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@ForceInline |
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public void putInt(Object o, long offset, int x) { |
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theInternalUnsafe.putInt(o, offset, x); |
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} |
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/** |
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* Fetches a reference value from a given Java variable. |
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* @see #getInt(Object, long) |
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*/ |
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@ForceInline |
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public Object getObject(Object o, long offset) { |
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return theInternalUnsafe.getObject(o, offset); |
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} |
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/** |
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* Stores a reference value into a given Java variable. |
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* <p> |
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* Unless the reference {@code x} being stored is either null |
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* or matches the field type, the results are undefined. |
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* If the reference {@code o} is non-null, card marks or |
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* other store barriers for that object (if the VM requires them) |
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* are updated. |
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* @see #putInt(Object, long, int) |
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*/ |
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@ForceInline |
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public void putObject(Object o, long offset, Object x) { |
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theInternalUnsafe.putObject(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
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public boolean getBoolean(Object o, long offset) { |
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return theInternalUnsafe.getBoolean(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
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public void putBoolean(Object o, long offset, boolean x) { |
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theInternalUnsafe.putBoolean(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
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public byte getByte(Object o, long offset) { |
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return theInternalUnsafe.getByte(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
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public void putByte(Object o, long offset, byte x) { |
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theInternalUnsafe.putByte(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
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public short getShort(Object o, long offset) { |
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return theInternalUnsafe.getShort(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
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public void putShort(Object o, long offset, short x) { |
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theInternalUnsafe.putShort(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
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public char getChar(Object o, long offset) { |
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return theInternalUnsafe.getChar(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
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public void putChar(Object o, long offset, char x) { |
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theInternalUnsafe.putChar(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
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public long getLong(Object o, long offset) { |
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return theInternalUnsafe.getLong(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
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public void putLong(Object o, long offset, long x) { |
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theInternalUnsafe.putLong(o, offset, x); |
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} |
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/** @see #getInt(Object, long) */ |
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@ForceInline |
279 |
public float getFloat(Object o, long offset) { |
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return theInternalUnsafe.getFloat(o, offset); |
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} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
285 |
public void putFloat(Object o, long offset, float x) { |
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286 |
theInternalUnsafe.putFloat(o, offset, x); |
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287 |
} |
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288 |
||
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/** @see #getInt(Object, long) */ |
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@ForceInline |
291 |
public double getDouble(Object o, long offset) { |
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292 |
return theInternalUnsafe.getDouble(o, offset); |
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293 |
} |
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/** @see #putInt(Object, long, int) */ |
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@ForceInline |
297 |
public void putDouble(Object o, long offset, double x) { |
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298 |
theInternalUnsafe.putDouble(o, offset, x); |
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299 |
} |
|
300 |
||
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// These work on values in the C heap. |
302 |
||
303 |
/** |
|
304 |
* Fetches a value from a given memory address. If the address is zero, or |
|
305 |
* does not point into a block obtained from {@link #allocateMemory}, the |
|
306 |
* results are undefined. |
|
307 |
* |
|
308 |
* @see #allocateMemory |
|
309 |
*/ |
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@ForceInline |
311 |
public byte getByte(long address) { |
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312 |
return theInternalUnsafe.getByte(address); |
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313 |
} |
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|
315 |
/** |
|
316 |
* Stores a value into a given memory address. If the address is zero, or |
|
317 |
* does not point into a block obtained from {@link #allocateMemory}, the |
|
318 |
* results are undefined. |
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319 |
* |
|
320 |
* @see #getByte(long) |
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321 |
*/ |
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@ForceInline |
323 |
public void putByte(long address, byte x) { |
|
324 |
theInternalUnsafe.putByte(address, x); |
|
325 |
} |
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326 |
||
327 |
/** @see #getByte(long) */ |
|
328 |
@ForceInline |
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329 |
public short getShort(long address) { |
|
330 |
return theInternalUnsafe.getShort(address); |
|
331 |
} |
|
332 |
||
333 |
/** @see #putByte(long, byte) */ |
|
334 |
@ForceInline |
|
335 |
public void putShort(long address, short x) { |
|
336 |
theInternalUnsafe.putShort(address, x); |
|
337 |
} |
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338 |
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339 |
/** @see #getByte(long) */ |
|
340 |
@ForceInline |
|
341 |
public char getChar(long address) { |
|
342 |
return theInternalUnsafe.getChar(address); |
|
343 |
} |
|
344 |
||
345 |
/** @see #putByte(long, byte) */ |
|
346 |
@ForceInline |
|
347 |
public void putChar(long address, char x) { |
|
348 |
theInternalUnsafe.putChar(address, x); |
|
349 |
} |
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|
351 |
/** @see #getByte(long) */ |
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36628 | 352 |
@ForceInline |
353 |
public int getInt(long address) { |
|
354 |
return theInternalUnsafe.getInt(address); |
|
355 |
} |
|
356 |
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2 | 357 |
/** @see #putByte(long, byte) */ |
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@ForceInline |
359 |
public void putInt(long address, int x) { |
|
360 |
theInternalUnsafe.putInt(address, x); |
|
361 |
} |
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362 |
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2 | 363 |
/** @see #getByte(long) */ |
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@ForceInline |
365 |
public long getLong(long address) { |
|
366 |
return theInternalUnsafe.getLong(address); |
|
367 |
} |
|
368 |
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2 | 369 |
/** @see #putByte(long, byte) */ |
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@ForceInline |
371 |
public void putLong(long address, long x) { |
|
372 |
theInternalUnsafe.putLong(address, x); |
|
373 |
} |
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374 |
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2 | 375 |
/** @see #getByte(long) */ |
36628 | 376 |
@ForceInline |
377 |
public float getFloat(long address) { |
|
378 |
return theInternalUnsafe.getFloat(address); |
|
379 |
} |
|
380 |
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2 | 381 |
/** @see #putByte(long, byte) */ |
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@ForceInline |
383 |
public void putFloat(long address, float x) { |
|
384 |
theInternalUnsafe.putFloat(address, x); |
|
385 |
} |
|
386 |
||
2 | 387 |
/** @see #getByte(long) */ |
36628 | 388 |
@ForceInline |
389 |
public double getDouble(long address) { |
|
390 |
return theInternalUnsafe.getDouble(address); |
|
391 |
} |
|
392 |
||
2 | 393 |
/** @see #putByte(long, byte) */ |
36628 | 394 |
@ForceInline |
395 |
public void putDouble(long address, double x) { |
|
396 |
theInternalUnsafe.putDouble(address, x); |
|
397 |
} |
|
398 |
||
2 | 399 |
|
400 |
/** |
|
401 |
* Fetches a native pointer from a given memory address. If the address is |
|
402 |
* zero, or does not point into a block obtained from {@link |
|
403 |
* #allocateMemory}, the results are undefined. |
|
404 |
* |
|
29388 | 405 |
* <p>If the native pointer is less than 64 bits wide, it is extended as |
2 | 406 |
* an unsigned number to a Java long. The pointer may be indexed by any |
407 |
* given byte offset, simply by adding that offset (as a simple integer) to |
|
408 |
* the long representing the pointer. The number of bytes actually read |
|
29388 | 409 |
* from the target address may be determined by consulting {@link |
2 | 410 |
* #addressSize}. |
411 |
* |
|
412 |
* @see #allocateMemory |
|
413 |
*/ |
|
36628 | 414 |
@ForceInline |
415 |
public long getAddress(long address) { |
|
416 |
return theInternalUnsafe.getAddress(address); |
|
417 |
} |
|
2 | 418 |
|
419 |
/** |
|
420 |
* Stores a native pointer into a given memory address. If the address is |
|
421 |
* zero, or does not point into a block obtained from {@link |
|
422 |
* #allocateMemory}, the results are undefined. |
|
423 |
* |
|
29388 | 424 |
* <p>The number of bytes actually written at the target address may be |
2 | 425 |
* determined by consulting {@link #addressSize}. |
426 |
* |
|
427 |
* @see #getAddress(long) |
|
428 |
*/ |
|
36628 | 429 |
@ForceInline |
430 |
public void putAddress(long address, long x) { |
|
431 |
theInternalUnsafe.putAddress(address, x); |
|
432 |
} |
|
433 |
||
2 | 434 |
|
435 |
/// wrappers for malloc, realloc, free: |
|
436 |
||
437 |
/** |
|
438 |
* Allocates a new block of native memory, of the given size in bytes. The |
|
439 |
* contents of the memory are uninitialized; they will generally be |
|
440 |
* garbage. The resulting native pointer will never be zero, and will be |
|
441 |
* aligned for all value types. Dispose of this memory by calling {@link |
|
442 |
* #freeMemory}, or resize it with {@link #reallocateMemory}. |
|
443 |
* |
|
36628 | 444 |
* <em>Note:</em> It is the resposibility of the caller to make |
445 |
* sure arguments are checked before the methods are called. While |
|
446 |
* some rudimentary checks are performed on the input, the checks |
|
447 |
* are best effort and when performance is an overriding priority, |
|
448 |
* as when methods of this class are optimized by the runtime |
|
449 |
* compiler, some or all checks (if any) may be elided. Hence, the |
|
450 |
* caller must not rely on the checks and corresponding |
|
451 |
* exceptions! |
|
452 |
* |
|
453 |
* @throws RuntimeException if the size is negative or too large |
|
2 | 454 |
* for the native size_t type |
455 |
* |
|
456 |
* @throws OutOfMemoryError if the allocation is refused by the system |
|
457 |
* |
|
458 |
* @see #getByte(long) |
|
459 |
* @see #putByte(long, byte) |
|
460 |
*/ |
|
36628 | 461 |
@ForceInline |
462 |
public long allocateMemory(long bytes) { |
|
463 |
return theInternalUnsafe.allocateMemory(bytes); |
|
464 |
} |
|
2 | 465 |
|
466 |
/** |
|
467 |
* Resizes a new block of native memory, to the given size in bytes. The |
|
468 |
* contents of the new block past the size of the old block are |
|
469 |
* uninitialized; they will generally be garbage. The resulting native |
|
470 |
* pointer will be zero if and only if the requested size is zero. The |
|
471 |
* resulting native pointer will be aligned for all value types. Dispose |
|
472 |
* of this memory by calling {@link #freeMemory}, or resize it with {@link |
|
473 |
* #reallocateMemory}. The address passed to this method may be null, in |
|
474 |
* which case an allocation will be performed. |
|
475 |
* |
|
36628 | 476 |
* <em>Note:</em> It is the resposibility of the caller to make |
477 |
* sure arguments are checked before the methods are called. While |
|
478 |
* some rudimentary checks are performed on the input, the checks |
|
479 |
* are best effort and when performance is an overriding priority, |
|
480 |
* as when methods of this class are optimized by the runtime |
|
481 |
* compiler, some or all checks (if any) may be elided. Hence, the |
|
482 |
* caller must not rely on the checks and corresponding |
|
483 |
* exceptions! |
|
484 |
* |
|
485 |
* @throws RuntimeException if the size is negative or too large |
|
2 | 486 |
* for the native size_t type |
487 |
* |
|
488 |
* @throws OutOfMemoryError if the allocation is refused by the system |
|
489 |
* |
|
490 |
* @see #allocateMemory |
|
491 |
*/ |
|
36628 | 492 |
@ForceInline |
493 |
public long reallocateMemory(long address, long bytes) { |
|
494 |
return theInternalUnsafe.reallocateMemory(address, bytes); |
|
495 |
} |
|
2 | 496 |
|
497 |
/** |
|
498 |
* Sets all bytes in a given block of memory to a fixed value |
|
499 |
* (usually zero). |
|
500 |
* |
|
501 |
* <p>This method determines a block's base address by means of two parameters, |
|
502 |
* and so it provides (in effect) a <em>double-register</em> addressing mode, |
|
503 |
* as discussed in {@link #getInt(Object,long)}. When the object reference is null, |
|
504 |
* the offset supplies an absolute base address. |
|
505 |
* |
|
506 |
* <p>The stores are in coherent (atomic) units of a size determined |
|
507 |
* by the address and length parameters. If the effective address and |
|
508 |
* length are all even modulo 8, the stores take place in 'long' units. |
|
509 |
* If the effective address and length are (resp.) even modulo 4 or 2, |
|
510 |
* the stores take place in units of 'int' or 'short'. |
|
511 |
* |
|
36628 | 512 |
* <em>Note:</em> It is the resposibility of the caller to make |
513 |
* sure arguments are checked before the methods are called. While |
|
514 |
* some rudimentary checks are performed on the input, the checks |
|
515 |
* are best effort and when performance is an overriding priority, |
|
516 |
* as when methods of this class are optimized by the runtime |
|
517 |
* compiler, some or all checks (if any) may be elided. Hence, the |
|
518 |
* caller must not rely on the checks and corresponding |
|
519 |
* exceptions! |
|
520 |
* |
|
521 |
* @throws RuntimeException if any of the arguments is invalid |
|
522 |
* |
|
2 | 523 |
* @since 1.7 |
524 |
*/ |
|
36628 | 525 |
@ForceInline |
526 |
public void setMemory(Object o, long offset, long bytes, byte value) { |
|
527 |
theInternalUnsafe.setMemory(o, offset, bytes, value); |
|
528 |
} |
|
2 | 529 |
|
530 |
/** |
|
531 |
* Sets all bytes in a given block of memory to a fixed value |
|
532 |
* (usually zero). This provides a <em>single-register</em> addressing mode, |
|
533 |
* as discussed in {@link #getInt(Object,long)}. |
|
534 |
* |
|
29388 | 535 |
* <p>Equivalent to {@code setMemory(null, address, bytes, value)}. |
2 | 536 |
*/ |
36628 | 537 |
@ForceInline |
2 | 538 |
public void setMemory(long address, long bytes, byte value) { |
36628 | 539 |
theInternalUnsafe.setMemory(address, bytes, value); |
2 | 540 |
} |
541 |
||
542 |
/** |
|
543 |
* Sets all bytes in a given block of memory to a copy of another |
|
544 |
* block. |
|
545 |
* |
|
546 |
* <p>This method determines each block's base address by means of two parameters, |
|
547 |
* and so it provides (in effect) a <em>double-register</em> addressing mode, |
|
548 |
* as discussed in {@link #getInt(Object,long)}. When the object reference is null, |
|
549 |
* the offset supplies an absolute base address. |
|
550 |
* |
|
551 |
* <p>The transfers are in coherent (atomic) units of a size determined |
|
552 |
* by the address and length parameters. If the effective addresses and |
|
553 |
* length are all even modulo 8, the transfer takes place in 'long' units. |
|
554 |
* If the effective addresses and length are (resp.) even modulo 4 or 2, |
|
555 |
* the transfer takes place in units of 'int' or 'short'. |
|
556 |
* |
|
36628 | 557 |
* <em>Note:</em> It is the resposibility of the caller to make |
558 |
* sure arguments are checked before the methods are called. While |
|
559 |
* some rudimentary checks are performed on the input, the checks |
|
560 |
* are best effort and when performance is an overriding priority, |
|
561 |
* as when methods of this class are optimized by the runtime |
|
562 |
* compiler, some or all checks (if any) may be elided. Hence, the |
|
563 |
* caller must not rely on the checks and corresponding |
|
564 |
* exceptions! |
|
565 |
* |
|
566 |
* @throws RuntimeException if any of the arguments is invalid |
|
567 |
* |
|
2 | 568 |
* @since 1.7 |
569 |
*/ |
|
36628 | 570 |
@ForceInline |
571 |
public void copyMemory(Object srcBase, long srcOffset, |
|
572 |
Object destBase, long destOffset, |
|
573 |
long bytes) { |
|
574 |
theInternalUnsafe.copyMemory(srcBase, srcOffset, destBase, destOffset, bytes); |
|
575 |
} |
|
576 |
||
2 | 577 |
/** |
578 |
* Sets all bytes in a given block of memory to a copy of another |
|
579 |
* block. This provides a <em>single-register</em> addressing mode, |
|
580 |
* as discussed in {@link #getInt(Object,long)}. |
|
581 |
* |
|
29388 | 582 |
* Equivalent to {@code copyMemory(null, srcAddress, null, destAddress, bytes)}. |
2 | 583 |
*/ |
36628 | 584 |
@ForceInline |
2 | 585 |
public void copyMemory(long srcAddress, long destAddress, long bytes) { |
36628 | 586 |
theInternalUnsafe.copyMemory(srcAddress, destAddress, bytes); |
2 | 587 |
} |
588 |
||
589 |
/** |
|
590 |
* Disposes of a block of native memory, as obtained from {@link |
|
591 |
* #allocateMemory} or {@link #reallocateMemory}. The address passed to |
|
592 |
* this method may be null, in which case no action is taken. |
|
593 |
* |
|
36628 | 594 |
* <em>Note:</em> It is the resposibility of the caller to make |
595 |
* sure arguments are checked before the methods are called. While |
|
596 |
* some rudimentary checks are performed on the input, the checks |
|
597 |
* are best effort and when performance is an overriding priority, |
|
598 |
* as when methods of this class are optimized by the runtime |
|
599 |
* compiler, some or all checks (if any) may be elided. Hence, the |
|
600 |
* caller must not rely on the checks and corresponding |
|
601 |
* exceptions! |
|
602 |
* |
|
603 |
* @throws RuntimeException if any of the arguments is invalid |
|
604 |
* |
|
2 | 605 |
* @see #allocateMemory |
606 |
*/ |
|
36628 | 607 |
@ForceInline |
608 |
public void freeMemory(long address) { |
|
609 |
theInternalUnsafe.freeMemory(address); |
|
610 |
} |
|
2 | 611 |
|
612 |
/// random queries |
|
613 |
||
614 |
/** |
|
615 |
* This constant differs from all results that will ever be returned from |
|
616 |
* {@link #staticFieldOffset}, {@link #objectFieldOffset}, |
|
617 |
* or {@link #arrayBaseOffset}. |
|
618 |
*/ |
|
36628 | 619 |
public static final int INVALID_FIELD_OFFSET = jdk.internal.misc.Unsafe.INVALID_FIELD_OFFSET; |
2 | 620 |
|
621 |
/** |
|
29388 | 622 |
* Reports the location of a given field in the storage allocation of its |
2 | 623 |
* class. Do not expect to perform any sort of arithmetic on this offset; |
624 |
* it is just a cookie which is passed to the unsafe heap memory accessors. |
|
625 |
* |
|
626 |
* <p>Any given field will always have the same offset and base, and no |
|
627 |
* two distinct fields of the same class will ever have the same offset |
|
628 |
* and base. |
|
629 |
* |
|
630 |
* <p>As of 1.4.1, offsets for fields are represented as long values, |
|
631 |
* although the Sun JVM does not use the most significant 32 bits. |
|
632 |
* However, JVM implementations which store static fields at absolute |
|
633 |
* addresses can use long offsets and null base pointers to express |
|
634 |
* the field locations in a form usable by {@link #getInt(Object,long)}. |
|
635 |
* Therefore, code which will be ported to such JVMs on 64-bit platforms |
|
636 |
* must preserve all bits of static field offsets. |
|
637 |
* @see #getInt(Object, long) |
|
638 |
*/ |
|
36628 | 639 |
@ForceInline |
640 |
public long objectFieldOffset(Field f) { |
|
641 |
return theInternalUnsafe.objectFieldOffset(f); |
|
642 |
} |
|
2 | 643 |
|
644 |
/** |
|
29388 | 645 |
* Reports the location of a given static field, in conjunction with {@link |
2 | 646 |
* #staticFieldBase}. |
647 |
* <p>Do not expect to perform any sort of arithmetic on this offset; |
|
648 |
* it is just a cookie which is passed to the unsafe heap memory accessors. |
|
649 |
* |
|
650 |
* <p>Any given field will always have the same offset, and no two distinct |
|
651 |
* fields of the same class will ever have the same offset. |
|
652 |
* |
|
653 |
* <p>As of 1.4.1, offsets for fields are represented as long values, |
|
654 |
* although the Sun JVM does not use the most significant 32 bits. |
|
655 |
* It is hard to imagine a JVM technology which needs more than |
|
656 |
* a few bits to encode an offset within a non-array object, |
|
657 |
* However, for consistency with other methods in this class, |
|
658 |
* this method reports its result as a long value. |
|
659 |
* @see #getInt(Object, long) |
|
660 |
*/ |
|
36628 | 661 |
@ForceInline |
662 |
public long staticFieldOffset(Field f) { |
|
663 |
return theInternalUnsafe.staticFieldOffset(f); |
|
664 |
} |
|
2 | 665 |
|
666 |
/** |
|
29388 | 667 |
* Reports the location of a given static field, in conjunction with {@link |
2 | 668 |
* #staticFieldOffset}. |
669 |
* <p>Fetch the base "Object", if any, with which static fields of the |
|
670 |
* given class can be accessed via methods like {@link #getInt(Object, |
|
671 |
* long)}. This value may be null. This value may refer to an object |
|
672 |
* which is a "cookie", not guaranteed to be a real Object, and it should |
|
673 |
* not be used in any way except as argument to the get and put routines in |
|
674 |
* this class. |
|
675 |
*/ |
|
36628 | 676 |
@ForceInline |
677 |
public Object staticFieldBase(Field f) { |
|
678 |
return theInternalUnsafe.staticFieldBase(f); |
|
679 |
} |
|
2 | 680 |
|
681 |
/** |
|
29388 | 682 |
* Detects if the given class may need to be initialized. This is often |
13423
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
683 |
* needed in conjunction with obtaining the static field base of a |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
684 |
* class. |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
685 |
* @return false only if a call to {@code ensureClassInitialized} would have no effect |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
686 |
*/ |
36628 | 687 |
@ForceInline |
688 |
public boolean shouldBeInitialized(Class<?> c) { |
|
689 |
return theInternalUnsafe.shouldBeInitialized(c); |
|
690 |
} |
|
13423
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
691 |
|
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
692 |
/** |
29388 | 693 |
* Ensures the given class has been initialized. This is often |
2 | 694 |
* needed in conjunction with obtaining the static field base of a |
695 |
* class. |
|
696 |
*/ |
|
36628 | 697 |
@ForceInline |
698 |
public void ensureClassInitialized(Class<?> c) { |
|
699 |
theInternalUnsafe.ensureClassInitialized(c); |
|
700 |
} |
|
2 | 701 |
|
702 |
/** |
|
29388 | 703 |
* Reports the offset of the first element in the storage allocation of a |
2 | 704 |
* given array class. If {@link #arrayIndexScale} returns a non-zero value |
705 |
* for the same class, you may use that scale factor, together with this |
|
706 |
* base offset, to form new offsets to access elements of arrays of the |
|
707 |
* given class. |
|
708 |
* |
|
709 |
* @see #getInt(Object, long) |
|
710 |
* @see #putInt(Object, long, int) |
|
711 |
*/ |
|
36628 | 712 |
@ForceInline |
713 |
public int arrayBaseOffset(Class<?> arrayClass) { |
|
714 |
return theInternalUnsafe.arrayBaseOffset(arrayClass); |
|
715 |
} |
|
2 | 716 |
|
717 |
/** The value of {@code arrayBaseOffset(boolean[].class)} */ |
|
36628 | 718 |
public static final int ARRAY_BOOLEAN_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_BOOLEAN_BASE_OFFSET; |
2 | 719 |
|
720 |
/** The value of {@code arrayBaseOffset(byte[].class)} */ |
|
36628 | 721 |
public static final int ARRAY_BYTE_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET; |
2 | 722 |
|
723 |
/** The value of {@code arrayBaseOffset(short[].class)} */ |
|
36628 | 724 |
public static final int ARRAY_SHORT_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_SHORT_BASE_OFFSET; |
2 | 725 |
|
726 |
/** The value of {@code arrayBaseOffset(char[].class)} */ |
|
36628 | 727 |
public static final int ARRAY_CHAR_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_CHAR_BASE_OFFSET; |
2 | 728 |
|
729 |
/** The value of {@code arrayBaseOffset(int[].class)} */ |
|
36628 | 730 |
public static final int ARRAY_INT_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_INT_BASE_OFFSET; |
2 | 731 |
|
732 |
/** The value of {@code arrayBaseOffset(long[].class)} */ |
|
36628 | 733 |
public static final int ARRAY_LONG_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_LONG_BASE_OFFSET; |
2 | 734 |
|
735 |
/** The value of {@code arrayBaseOffset(float[].class)} */ |
|
36628 | 736 |
public static final int ARRAY_FLOAT_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_FLOAT_BASE_OFFSET; |
2 | 737 |
|
738 |
/** The value of {@code arrayBaseOffset(double[].class)} */ |
|
36628 | 739 |
public static final int ARRAY_DOUBLE_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_DOUBLE_BASE_OFFSET; |
2 | 740 |
|
741 |
/** The value of {@code arrayBaseOffset(Object[].class)} */ |
|
36628 | 742 |
public static final int ARRAY_OBJECT_BASE_OFFSET = jdk.internal.misc.Unsafe.ARRAY_OBJECT_BASE_OFFSET; |
2 | 743 |
|
744 |
/** |
|
29388 | 745 |
* Reports the scale factor for addressing elements in the storage |
2 | 746 |
* allocation of a given array class. However, arrays of "narrow" types |
747 |
* will generally not work properly with accessors like {@link |
|
29028
f97d41a21983
8068975: Remove deprecated methods on sun.misc.Unsafe and clean up native implementation
psandoz
parents:
28671
diff
changeset
|
748 |
* #getByte(Object, long)}, so the scale factor for such classes is reported |
2 | 749 |
* as zero. |
750 |
* |
|
751 |
* @see #arrayBaseOffset |
|
752 |
* @see #getInt(Object, long) |
|
753 |
* @see #putInt(Object, long, int) |
|
754 |
*/ |
|
36628 | 755 |
@ForceInline |
756 |
public int arrayIndexScale(Class<?> arrayClass) { |
|
757 |
return theInternalUnsafe.arrayIndexScale(arrayClass); |
|
758 |
} |
|
2 | 759 |
|
760 |
/** The value of {@code arrayIndexScale(boolean[].class)} */ |
|
36628 | 761 |
public static final int ARRAY_BOOLEAN_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_BOOLEAN_INDEX_SCALE; |
2 | 762 |
|
763 |
/** The value of {@code arrayIndexScale(byte[].class)} */ |
|
36628 | 764 |
public static final int ARRAY_BYTE_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_BYTE_INDEX_SCALE; |
2 | 765 |
|
766 |
/** The value of {@code arrayIndexScale(short[].class)} */ |
|
36628 | 767 |
public static final int ARRAY_SHORT_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_SHORT_INDEX_SCALE; |
2 | 768 |
|
769 |
/** The value of {@code arrayIndexScale(char[].class)} */ |
|
36628 | 770 |
public static final int ARRAY_CHAR_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_CHAR_INDEX_SCALE; |
2 | 771 |
|
772 |
/** The value of {@code arrayIndexScale(int[].class)} */ |
|
36628 | 773 |
public static final int ARRAY_INT_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_INT_INDEX_SCALE; |
2 | 774 |
|
775 |
/** The value of {@code arrayIndexScale(long[].class)} */ |
|
36628 | 776 |
public static final int ARRAY_LONG_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_LONG_INDEX_SCALE; |
2 | 777 |
|
778 |
/** The value of {@code arrayIndexScale(float[].class)} */ |
|
36628 | 779 |
public static final int ARRAY_FLOAT_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_FLOAT_INDEX_SCALE; |
2 | 780 |
|
781 |
/** The value of {@code arrayIndexScale(double[].class)} */ |
|
36628 | 782 |
public static final int ARRAY_DOUBLE_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_DOUBLE_INDEX_SCALE; |
2 | 783 |
|
784 |
/** The value of {@code arrayIndexScale(Object[].class)} */ |
|
36628 | 785 |
public static final int ARRAY_OBJECT_INDEX_SCALE = jdk.internal.misc.Unsafe.ARRAY_OBJECT_INDEX_SCALE; |
2 | 786 |
|
787 |
/** |
|
29388 | 788 |
* Reports the size in bytes of a native pointer, as stored via {@link |
2 | 789 |
* #putAddress}. This value will be either 4 or 8. Note that the sizes of |
790 |
* other primitive types (as stored in native memory blocks) is determined |
|
791 |
* fully by their information content. |
|
792 |
*/ |
|
36628 | 793 |
@ForceInline |
794 |
public int addressSize() { |
|
795 |
return theInternalUnsafe.addressSize(); |
|
796 |
} |
|
2 | 797 |
|
798 |
/** The value of {@code addressSize()} */ |
|
36628 | 799 |
public static final int ADDRESS_SIZE = theInternalUnsafe.addressSize(); |
2 | 800 |
|
801 |
/** |
|
29388 | 802 |
* Reports the size in bytes of a native memory page (whatever that is). |
2 | 803 |
* This value will always be a power of two. |
804 |
*/ |
|
36628 | 805 |
@ForceInline |
806 |
public int pageSize() { |
|
807 |
return theInternalUnsafe.pageSize(); |
|
808 |
} |
|
2 | 809 |
|
810 |
||
811 |
/// random trusted operations from JNI: |
|
812 |
||
813 |
/** |
|
29388 | 814 |
* Tells the VM to define a class, without security checks. By default, the |
2 | 815 |
* class loader and protection domain come from the caller's class. |
45635 | 816 |
* |
817 |
* @deprecated Use {@link java.lang.invoke.MethodHandles.Lookup#defineClass MethodHandles.Lookup#defineClass} |
|
818 |
* to define a class to the same class loader and in the same runtime package |
|
819 |
* and {@linkplain java.security.ProtectionDomain protection domain} of a |
|
820 |
* given {@code Lookup}'s {@linkplain java.lang.invoke.MethodHandles.Lookup#lookupClass() lookup class}. |
|
821 |
* |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
42707
diff
changeset
|
822 |
* @see java.lang.invoke.MethodHandles.Lookup#defineClass(byte[]) |
2 | 823 |
*/ |
45635 | 824 |
@Deprecated(since="9", forRemoval=true) |
36628 | 825 |
@ForceInline |
826 |
public Class<?> defineClass(String name, byte[] b, int off, int len, |
|
827 |
ClassLoader loader, |
|
828 |
ProtectionDomain protectionDomain) { |
|
829 |
return theInternalUnsafe.defineClass(name, b, off, len, loader, protectionDomain); |
|
830 |
} |
|
2 | 831 |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
832 |
/** |
29388 | 833 |
* Defines a class but does not make it known to the class loader or system dictionary. |
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
834 |
* <p> |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
835 |
* For each CP entry, the corresponding CP patch must either be null or have |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
836 |
* the a format that matches its tag: |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
837 |
* <ul> |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
838 |
* <li>Integer, Long, Float, Double: the corresponding wrapper object type from java.lang |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
839 |
* <li>Utf8: a string (must have suitable syntax if used as signature or name) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
840 |
* <li>Class: any java.lang.Class object |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
841 |
* <li>String: any object (not just a java.lang.String) |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
842 |
* <li>InterfaceMethodRef: (NYI) a method handle to invoke on that call site's arguments |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
843 |
* </ul> |
30655 | 844 |
* @param hostClass context for linkage, access control, protection domain, and class loader |
845 |
* @param data bytes of a class file |
|
846 |
* @param cpPatches where non-null entries exist, they replace corresponding CP entries in data |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
847 |
*/ |
36628 | 848 |
@ForceInline |
849 |
public Class<?> defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches) { |
|
850 |
return theInternalUnsafe.defineAnonymousClass(hostClass, data, cpPatches); |
|
851 |
} |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
852 |
|
29388 | 853 |
/** |
854 |
* Allocates an instance but does not run any constructor. |
|
855 |
* Initializes the class if it has not yet been. |
|
856 |
*/ |
|
36628 | 857 |
@ForceInline |
858 |
public Object allocateInstance(Class<?> cls) |
|
859 |
throws InstantiationException { |
|
860 |
return theInternalUnsafe.allocateInstance(cls); |
|
861 |
} |
|
2 | 862 |
|
29388 | 863 |
/** Throws the exception without telling the verifier. */ |
36628 | 864 |
@ForceInline |
865 |
public void throwException(Throwable ee) { |
|
866 |
theInternalUnsafe.throwException(ee); |
|
867 |
} |
|
2 | 868 |
|
869 |
/** |
|
29388 | 870 |
* Atomically updates Java variable to {@code x} if it is currently |
871 |
* holding {@code expected}. |
|
29715
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
872 |
* |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
873 |
* <p>This operation has memory semantics of a {@code volatile} read |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
874 |
* and write. Corresponds to C11 atomic_compare_exchange_strong. |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
875 |
* |
29388 | 876 |
* @return {@code true} if successful |
2 | 877 |
*/ |
36628 | 878 |
@ForceInline |
879 |
public final boolean compareAndSwapObject(Object o, long offset, |
|
880 |
Object expected, |
|
881 |
Object x) { |
|
45518
4a116dd82fb5
8181292: Backport Rename internal Unsafe.compare methods from 10 to 9
psandoz
parents:
44359
diff
changeset
|
882 |
return theInternalUnsafe.compareAndSetObject(o, offset, expected, x); |
36628 | 883 |
} |
2 | 884 |
|
885 |
/** |
|
29388 | 886 |
* Atomically updates Java variable to {@code x} if it is currently |
887 |
* holding {@code expected}. |
|
29715
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
888 |
* |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
889 |
* <p>This operation has memory semantics of a {@code volatile} read |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
890 |
* and write. Corresponds to C11 atomic_compare_exchange_strong. |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
891 |
* |
29388 | 892 |
* @return {@code true} if successful |
2 | 893 |
*/ |
36628 | 894 |
@ForceInline |
895 |
public final boolean compareAndSwapInt(Object o, long offset, |
|
896 |
int expected, |
|
897 |
int x) { |
|
45518
4a116dd82fb5
8181292: Backport Rename internal Unsafe.compare methods from 10 to 9
psandoz
parents:
44359
diff
changeset
|
898 |
return theInternalUnsafe.compareAndSetInt(o, offset, expected, x); |
36628 | 899 |
} |
2 | 900 |
|
901 |
/** |
|
29388 | 902 |
* Atomically updates Java variable to {@code x} if it is currently |
903 |
* holding {@code expected}. |
|
29715
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
904 |
* |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
905 |
* <p>This operation has memory semantics of a {@code volatile} read |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
906 |
* and write. Corresponds to C11 atomic_compare_exchange_strong. |
ca3f43a932cf
8074578: Document memory visibility effects of Unsafe compareAndSwap methods
martin
parents:
29388
diff
changeset
|
907 |
* |
29388 | 908 |
* @return {@code true} if successful |
2 | 909 |
*/ |
36628 | 910 |
@ForceInline |
911 |
public final boolean compareAndSwapLong(Object o, long offset, |
|
912 |
long expected, |
|
913 |
long x) { |
|
45518
4a116dd82fb5
8181292: Backport Rename internal Unsafe.compare methods from 10 to 9
psandoz
parents:
44359
diff
changeset
|
914 |
return theInternalUnsafe.compareAndSetLong(o, offset, expected, x); |
36628 | 915 |
} |
2 | 916 |
|
917 |
/** |
|
918 |
* Fetches a reference value from a given Java variable, with volatile |
|
919 |
* load semantics. Otherwise identical to {@link #getObject(Object, long)} |
|
920 |
*/ |
|
36628 | 921 |
@ForceInline |
922 |
public Object getObjectVolatile(Object o, long offset) { |
|
923 |
return theInternalUnsafe.getObjectVolatile(o, offset); |
|
924 |
} |
|
2 | 925 |
|
926 |
/** |
|
927 |
* Stores a reference value into a given Java variable, with |
|
928 |
* volatile store semantics. Otherwise identical to {@link #putObject(Object, long, Object)} |
|
929 |
*/ |
|
36628 | 930 |
@ForceInline |
931 |
public void putObjectVolatile(Object o, long offset, Object x) { |
|
932 |
theInternalUnsafe.putObjectVolatile(o, offset, x); |
|
933 |
} |
|
2 | 934 |
|
935 |
/** Volatile version of {@link #getInt(Object, long)} */ |
|
36628 | 936 |
@ForceInline |
937 |
public int getIntVolatile(Object o, long offset) { |
|
938 |
return theInternalUnsafe.getIntVolatile(o, offset); |
|
939 |
} |
|
2 | 940 |
|
941 |
/** Volatile version of {@link #putInt(Object, long, int)} */ |
|
36628 | 942 |
@ForceInline |
943 |
public void putIntVolatile(Object o, long offset, int x) { |
|
944 |
theInternalUnsafe.putIntVolatile(o, offset, x); |
|
945 |
} |
|
2 | 946 |
|
947 |
/** Volatile version of {@link #getBoolean(Object, long)} */ |
|
36628 | 948 |
@ForceInline |
949 |
public boolean getBooleanVolatile(Object o, long offset) { |
|
950 |
return theInternalUnsafe.getBooleanVolatile(o, offset); |
|
951 |
} |
|
2 | 952 |
|
953 |
/** Volatile version of {@link #putBoolean(Object, long, boolean)} */ |
|
36628 | 954 |
@ForceInline |
955 |
public void putBooleanVolatile(Object o, long offset, boolean x) { |
|
956 |
theInternalUnsafe.putBooleanVolatile(o, offset, x); |
|
957 |
} |
|
2 | 958 |
|
959 |
/** Volatile version of {@link #getByte(Object, long)} */ |
|
36628 | 960 |
@ForceInline |
961 |
public byte getByteVolatile(Object o, long offset) { |
|
962 |
return theInternalUnsafe.getByteVolatile(o, offset); |
|
963 |
} |
|
2 | 964 |
|
965 |
/** Volatile version of {@link #putByte(Object, long, byte)} */ |
|
36628 | 966 |
@ForceInline |
967 |
public void putByteVolatile(Object o, long offset, byte x) { |
|
968 |
theInternalUnsafe.putByteVolatile(o, offset, x); |
|
969 |
} |
|
2 | 970 |
|
971 |
/** Volatile version of {@link #getShort(Object, long)} */ |
|
36628 | 972 |
@ForceInline |
973 |
public short getShortVolatile(Object o, long offset) { |
|
974 |
return theInternalUnsafe.getShortVolatile(o, offset); |
|
975 |
} |
|
2 | 976 |
|
977 |
/** Volatile version of {@link #putShort(Object, long, short)} */ |
|
36628 | 978 |
@ForceInline |
979 |
public void putShortVolatile(Object o, long offset, short x) { |
|
980 |
theInternalUnsafe.putShortVolatile(o, offset, x); |
|
981 |
} |
|
2 | 982 |
|
983 |
/** Volatile version of {@link #getChar(Object, long)} */ |
|
36628 | 984 |
@ForceInline |
985 |
public char getCharVolatile(Object o, long offset) { |
|
986 |
return theInternalUnsafe.getCharVolatile(o, offset); |
|
987 |
} |
|
2 | 988 |
|
989 |
/** Volatile version of {@link #putChar(Object, long, char)} */ |
|
36628 | 990 |
@ForceInline |
991 |
public void putCharVolatile(Object o, long offset, char x) { |
|
992 |
theInternalUnsafe.putCharVolatile(o, offset, x); |
|
993 |
} |
|
2 | 994 |
|
995 |
/** Volatile version of {@link #getLong(Object, long)} */ |
|
36628 | 996 |
@ForceInline |
997 |
public long getLongVolatile(Object o, long offset) { |
|
998 |
return theInternalUnsafe.getLongVolatile(o, offset); |
|
999 |
} |
|
2 | 1000 |
|
1001 |
/** Volatile version of {@link #putLong(Object, long, long)} */ |
|
36628 | 1002 |
@ForceInline |
1003 |
public void putLongVolatile(Object o, long offset, long x) { |
|
1004 |
theInternalUnsafe.putLongVolatile(o, offset, x); |
|
1005 |
} |
|
2 | 1006 |
|
1007 |
/** Volatile version of {@link #getFloat(Object, long)} */ |
|
36628 | 1008 |
@ForceInline |
1009 |
public float getFloatVolatile(Object o, long offset) { |
|
1010 |
return theInternalUnsafe.getFloatVolatile(o, offset); |
|
1011 |
} |
|
2 | 1012 |
|
1013 |
/** Volatile version of {@link #putFloat(Object, long, float)} */ |
|
36628 | 1014 |
@ForceInline |
1015 |
public void putFloatVolatile(Object o, long offset, float x) { |
|
1016 |
theInternalUnsafe.putFloatVolatile(o, offset, x); |
|
1017 |
} |
|
2 | 1018 |
|
1019 |
/** Volatile version of {@link #getDouble(Object, long)} */ |
|
36628 | 1020 |
@ForceInline |
1021 |
public double getDoubleVolatile(Object o, long offset) { |
|
1022 |
return theInternalUnsafe.getDoubleVolatile(o, offset); |
|
1023 |
} |
|
2 | 1024 |
|
1025 |
/** Volatile version of {@link #putDouble(Object, long, double)} */ |
|
36628 | 1026 |
@ForceInline |
1027 |
public void putDoubleVolatile(Object o, long offset, double x) { |
|
1028 |
theInternalUnsafe.putDoubleVolatile(o, offset, x); |
|
1029 |
} |
|
2 | 1030 |
|
1031 |
/** |
|
1032 |
* Version of {@link #putObjectVolatile(Object, long, Object)} |
|
1033 |
* that does not guarantee immediate visibility of the store to |
|
1034 |
* other threads. This method is generally only useful if the |
|
1035 |
* underlying field is a Java volatile (or if an array cell, one |
|
1036 |
* that is otherwise only accessed using volatile accesses). |
|
28057
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1037 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1038 |
* Corresponds to C11 atomic_store_explicit(..., memory_order_release). |
2 | 1039 |
*/ |
36628 | 1040 |
@ForceInline |
1041 |
public void putOrderedObject(Object o, long offset, Object x) { |
|
36936
bfcdf736a998
8152698: Remove obsolete Unsafe.putOrdered{X} methods, usages, runtime and compiler support
shade
parents:
36628
diff
changeset
|
1042 |
theInternalUnsafe.putObjectRelease(o, offset, x); |
36628 | 1043 |
} |
2 | 1044 |
|
1045 |
/** Ordered/Lazy version of {@link #putIntVolatile(Object, long, int)} */ |
|
36628 | 1046 |
@ForceInline |
1047 |
public void putOrderedInt(Object o, long offset, int x) { |
|
36936
bfcdf736a998
8152698: Remove obsolete Unsafe.putOrdered{X} methods, usages, runtime and compiler support
shade
parents:
36628
diff
changeset
|
1048 |
theInternalUnsafe.putIntRelease(o, offset, x); |
36628 | 1049 |
} |
2 | 1050 |
|
1051 |
/** Ordered/Lazy version of {@link #putLongVolatile(Object, long, long)} */ |
|
36628 | 1052 |
@ForceInline |
1053 |
public void putOrderedLong(Object o, long offset, long x) { |
|
36936
bfcdf736a998
8152698: Remove obsolete Unsafe.putOrdered{X} methods, usages, runtime and compiler support
shade
parents:
36628
diff
changeset
|
1054 |
theInternalUnsafe.putLongRelease(o, offset, x); |
36628 | 1055 |
} |
2 | 1056 |
|
1057 |
/** |
|
29388 | 1058 |
* Unblocks the given thread blocked on {@code park}, or, if it is |
1059 |
* not blocked, causes the subsequent call to {@code park} not to |
|
2 | 1060 |
* block. Note: this operation is "unsafe" solely because the |
1061 |
* caller must somehow ensure that the thread has not been |
|
1062 |
* destroyed. Nothing special is usually required to ensure this |
|
1063 |
* when called from Java (in which there will ordinarily be a live |
|
1064 |
* reference to the thread) but this is not nearly-automatically |
|
1065 |
* so when calling from native code. |
|
29388 | 1066 |
* |
2 | 1067 |
* @param thread the thread to unpark. |
1068 |
*/ |
|
36628 | 1069 |
@ForceInline |
1070 |
public void unpark(Object thread) { |
|
1071 |
theInternalUnsafe.unpark(thread); |
|
1072 |
} |
|
2 | 1073 |
|
1074 |
/** |
|
29388 | 1075 |
* Blocks current thread, returning when a balancing |
1076 |
* {@code unpark} occurs, or a balancing {@code unpark} has |
|
2 | 1077 |
* already occurred, or the thread is interrupted, or, if not |
1078 |
* absolute and time is not zero, the given time nanoseconds have |
|
1079 |
* elapsed, or if absolute, the given deadline in milliseconds |
|
1080 |
* since Epoch has passed, or spuriously (i.e., returning for no |
|
1081 |
* "reason"). Note: This operation is in the Unsafe class only |
|
29388 | 1082 |
* because {@code unpark} is, so it would be strange to place it |
2 | 1083 |
* elsewhere. |
1084 |
*/ |
|
36628 | 1085 |
@ForceInline |
1086 |
public void park(boolean isAbsolute, long time) { |
|
1087 |
theInternalUnsafe.park(isAbsolute, time); |
|
1088 |
} |
|
2 | 1089 |
|
1090 |
/** |
|
1091 |
* Gets the load average in the system run queue assigned |
|
1092 |
* to the available processors averaged over various periods of time. |
|
29388 | 1093 |
* This method retrieves the given {@code nelem} samples and |
1094 |
* assigns to the elements of the given {@code loadavg} array. |
|
2 | 1095 |
* The system imposes a maximum of 3 samples, representing |
1096 |
* averages over the last 1, 5, and 15 minutes, respectively. |
|
1097 |
* |
|
30655 | 1098 |
* @param loadavg an array of double of size nelems |
1099 |
* @param nelems the number of samples to be retrieved and |
|
1100 |
* must be 1 to 3. |
|
2 | 1101 |
* |
1102 |
* @return the number of samples actually retrieved; or -1 |
|
1103 |
* if the load average is unobtainable. |
|
1104 |
*/ |
|
36628 | 1105 |
@ForceInline |
1106 |
public int getLoadAverage(double[] loadavg, int nelems) { |
|
1107 |
return theInternalUnsafe.getLoadAverage(loadavg, nelems); |
|
1108 |
} |
|
14851 | 1109 |
|
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1110 |
// The following contain CAS-based Java implementations used on |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1111 |
// platforms not supporting native instructions |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1112 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1113 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1114 |
* Atomically adds the given value to the current value of a field |
29388 | 1115 |
* or array element within the given object {@code o} |
1116 |
* at the given {@code offset}. |
|
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1117 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1118 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1119 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1120 |
* @param delta the value to add |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1121 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1122 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1123 |
*/ |
36628 | 1124 |
@ForceInline |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1125 |
public final int getAndAddInt(Object o, long offset, int delta) { |
36628 | 1126 |
return theInternalUnsafe.getAndAddInt(o, offset, delta); |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1127 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1128 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1129 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1130 |
* Atomically adds the given value to the current value of a field |
29388 | 1131 |
* or array element within the given object {@code o} |
1132 |
* at the given {@code offset}. |
|
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1133 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1134 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1135 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1136 |
* @param delta the value to add |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1137 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1138 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1139 |
*/ |
36628 | 1140 |
@ForceInline |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1141 |
public final long getAndAddLong(Object o, long offset, long delta) { |
36628 | 1142 |
return theInternalUnsafe.getAndAddLong(o, offset, delta); |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1143 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1144 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1145 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1146 |
* Atomically exchanges the given value with the current value of |
29388 | 1147 |
* a field or array element within the given object {@code o} |
1148 |
* at the given {@code offset}. |
|
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1149 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1150 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1151 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1152 |
* @param newValue new value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1153 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1154 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1155 |
*/ |
36628 | 1156 |
@ForceInline |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1157 |
public final int getAndSetInt(Object o, long offset, int newValue) { |
36628 | 1158 |
return theInternalUnsafe.getAndSetInt(o, offset, newValue); |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1159 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1160 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1161 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1162 |
* Atomically exchanges the given value with the current value of |
29388 | 1163 |
* a field or array element within the given object {@code o} |
1164 |
* at the given {@code offset}. |
|
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1165 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1166 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1167 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1168 |
* @param newValue new value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1169 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1170 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1171 |
*/ |
36628 | 1172 |
@ForceInline |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1173 |
public final long getAndSetLong(Object o, long offset, long newValue) { |
36628 | 1174 |
return theInternalUnsafe.getAndSetLong(o, offset, newValue); |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1175 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1176 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1177 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1178 |
* Atomically exchanges the given reference value with the current |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1179 |
* reference value of a field or array element within the given |
29388 | 1180 |
* object {@code o} at the given {@code offset}. |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1181 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1182 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1183 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1184 |
* @param newValue new value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1185 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1186 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1187 |
*/ |
36628 | 1188 |
@ForceInline |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1189 |
public final Object getAndSetObject(Object o, long offset, Object newValue) { |
36628 | 1190 |
return theInternalUnsafe.getAndSetObject(o, offset, newValue); |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1191 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1192 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1193 |
|
14851 | 1194 |
/** |
28057
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1195 |
* Ensures that loads before the fence will not be reordered with loads and |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1196 |
* stores after the fence; a "LoadLoad plus LoadStore barrier". |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1197 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1198 |
* Corresponds to C11 atomic_thread_fence(memory_order_acquire) |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1199 |
* (an "acquire fence"). |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1200 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1201 |
* A pure LoadLoad fence is not provided, since the addition of LoadStore |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1202 |
* is almost always desired, and most current hardware instructions that |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1203 |
* provide a LoadLoad barrier also provide a LoadStore barrier for free. |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1204 |
* @since 1.8 |
14851 | 1205 |
*/ |
36628 | 1206 |
@ForceInline |
1207 |
public void loadFence() { |
|
1208 |
theInternalUnsafe.loadFence(); |
|
1209 |
} |
|
14851 | 1210 |
|
1211 |
/** |
|
28057
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1212 |
* Ensures that loads and stores before the fence will not be reordered with |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1213 |
* stores after the fence; a "StoreStore plus LoadStore barrier". |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1214 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1215 |
* Corresponds to C11 atomic_thread_fence(memory_order_release) |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1216 |
* (a "release fence"). |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1217 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1218 |
* A pure StoreStore fence is not provided, since the addition of LoadStore |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1219 |
* is almost always desired, and most current hardware instructions that |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1220 |
* provide a StoreStore barrier also provide a LoadStore barrier for free. |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1221 |
* @since 1.8 |
14851 | 1222 |
*/ |
36628 | 1223 |
@ForceInline |
1224 |
public void storeFence() { |
|
1225 |
theInternalUnsafe.storeFence(); |
|
1226 |
} |
|
14851 | 1227 |
|
1228 |
/** |
|
28057
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1229 |
* Ensures that loads and stores before the fence will not be reordered |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1230 |
* with loads and stores after the fence. Implies the effects of both |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1231 |
* loadFence() and storeFence(), and in addition, the effect of a StoreLoad |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1232 |
* barrier. |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1233 |
* |
1a47ceecdba5
8065804: JEP 171: Clarifications/corrections for fence intrinsics
martin
parents:
25859
diff
changeset
|
1234 |
* Corresponds to C11 atomic_thread_fence(memory_order_seq_cst). |
14853
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1235 |
* @since 1.8 |
14851 | 1236 |
*/ |
36628 | 1237 |
@ForceInline |
1238 |
public void fullFence() { |
|
1239 |
theInternalUnsafe.fullFence(); |
|
21851
f21f49c7c265
8016839: JSR292: AME instead of IAE when calling a method
jrose
parents:
16906
diff
changeset
|
1240 |
} |
42707 | 1241 |
|
1242 |
/** |
|
1243 |
* Invokes the given direct byte buffer's cleaner, if any. |
|
1244 |
* |
|
1245 |
* @param directBuffer a direct byte buffer |
|
1246 |
* @throws NullPointerException if {@code directBuffer} is null |
|
1247 |
* @throws IllegalArgumentException if {@code directBuffer} is non-direct, |
|
1248 |
* or is a {@link java.nio.Buffer#slice slice}, or is a |
|
1249 |
* {@link java.nio.Buffer#duplicate duplicate} |
|
1250 |
* @since 9 |
|
1251 |
*/ |
|
1252 |
public void invokeCleaner(java.nio.ByteBuffer directBuffer) { |
|
1253 |
if (!directBuffer.isDirect()) |
|
1254 |
throw new IllegalArgumentException("buffer is non-direct"); |
|
1255 |
||
1256 |
DirectBuffer db = (DirectBuffer)directBuffer; |
|
1257 |
if (db.attachment() != null) |
|
1258 |
throw new IllegalArgumentException("duplicate or slice"); |
|
1259 |
||
1260 |
Cleaner cleaner = db.cleaner(); |
|
1261 |
if (cleaner != null) { |
|
1262 |
cleaner.clean(); |
|
1263 |
} |
|
1264 |
} |
|
2 | 1265 |
} |