author | alanb |
Fri, 22 Feb 2013 14:04:06 +0000 | |
changeset 16023 | 58ecc1b8327b |
parent 14853 | 72f0bc58bb95 |
child 16906 | 44dfee24cb71 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 2000, 2012, 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 java.security.*; |
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import java.lang.reflect.*; |
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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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* @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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private static native void registerNatives(); |
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static { |
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registerNatives(); |
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sun.reflect.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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/** |
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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</code> 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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* <blockquote><pre> |
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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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* } |
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* </pre></blockquote> |
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* |
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* (It may assist compilers to make the local variable be |
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* <code>final</code>.) |
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* |
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* @exception SecurityException if a security manager exists and its |
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* <code>checkPropertiesAccess</code> method doesn't allow |
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* access to the system properties. |
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*/ |
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public static Unsafe getUnsafe() { |
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Class<?> cc = sun.reflect.Reflection.getCallerClass(2); |
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if (!VM.isSystemDomainLoader(cc.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</code> at the given offset, or (if <code>o</code> is |
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* null) from the memory address whose numerical value is the given |
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* 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</code> 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</code> (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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* |
|
115 |
* <li>The object referred to by <code>o</code> is an array, and the offset |
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* is an integer of the form <code>B+N*S</code>, where <code>N</code> is |
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* a valid index into the array, and <code>B</code> and <code>S</code> 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</code><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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124 |
* If one of the above cases is true, the call references a specific Java |
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125 |
* 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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128 |
* This method refers to a variable by means of two parameters, and so |
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129 |
* 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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public native int getInt(Object o, long offset); |
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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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155 |
* 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</code>. |
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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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172 |
public native void putInt(Object o, long offset, int x); |
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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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public native Object getObject(Object o, long offset); |
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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</code> being stored is either null |
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184 |
* or matches the field type, the results are undefined. |
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185 |
* If the reference <code>o</code> is non-null, car marks or |
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186 |
* other store barriers for that object (if the VM requires them) |
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187 |
* are updated. |
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* @see #putInt(Object, int, int) |
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*/ |
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190 |
public native void putObject(Object o, long offset, Object x); |
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192 |
/** @see #getInt(Object, long) */ |
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193 |
public native boolean getBoolean(Object o, long offset); |
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194 |
/** @see #putInt(Object, int, int) */ |
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public native void putBoolean(Object o, long offset, boolean x); |
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196 |
/** @see #getInt(Object, long) */ |
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public native byte getByte(Object o, long offset); |
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198 |
/** @see #putInt(Object, int, int) */ |
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199 |
public native void putByte(Object o, long offset, byte x); |
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200 |
/** @see #getInt(Object, long) */ |
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201 |
public native short getShort(Object o, long offset); |
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202 |
/** @see #putInt(Object, int, int) */ |
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203 |
public native void putShort(Object o, long offset, short x); |
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/** @see #getInt(Object, long) */ |
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205 |
public native char getChar(Object o, long offset); |
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206 |
/** @see #putInt(Object, int, int) */ |
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public native void putChar(Object o, long offset, char x); |
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/** @see #getInt(Object, long) */ |
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209 |
public native long getLong(Object o, long offset); |
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210 |
/** @see #putInt(Object, int, int) */ |
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public native void putLong(Object o, long offset, long x); |
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/** @see #getInt(Object, long) */ |
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213 |
public native float getFloat(Object o, long offset); |
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/** @see #putInt(Object, int, int) */ |
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215 |
public native void putFloat(Object o, long offset, float x); |
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216 |
/** @see #getInt(Object, long) */ |
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217 |
public native double getDouble(Object o, long offset); |
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/** @see #putInt(Object, int, int) */ |
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public native void putDouble(Object o, long offset, double x); |
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/** |
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222 |
* This method, like all others with 32-bit offsets, was native |
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223 |
* in a previous release but is now a wrapper which simply casts |
|
224 |
* the offset to a long value. It provides backward compatibility |
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225 |
* with bytecodes compiled against 1.4. |
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226 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
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227 |
* See {@link #staticFieldOffset}. |
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228 |
*/ |
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229 |
@Deprecated |
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230 |
public int getInt(Object o, int offset) { |
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231 |
return getInt(o, (long)offset); |
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232 |
} |
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/** |
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* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
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* See {@link #staticFieldOffset}. |
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237 |
*/ |
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238 |
@Deprecated |
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239 |
public void putInt(Object o, int offset, int x) { |
|
240 |
putInt(o, (long)offset, x); |
|
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} |
|
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/** |
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* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
245 |
* See {@link #staticFieldOffset}. |
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246 |
*/ |
|
247 |
@Deprecated |
|
248 |
public Object getObject(Object o, int offset) { |
|
249 |
return getObject(o, (long)offset); |
|
250 |
} |
|
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/** |
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* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
254 |
* See {@link #staticFieldOffset}. |
|
255 |
*/ |
|
256 |
@Deprecated |
|
257 |
public void putObject(Object o, int offset, Object x) { |
|
258 |
putObject(o, (long)offset, x); |
|
259 |
} |
|
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/** |
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* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
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* See {@link #staticFieldOffset}. |
|
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*/ |
|
265 |
@Deprecated |
|
266 |
public boolean getBoolean(Object o, int offset) { |
|
267 |
return getBoolean(o, (long)offset); |
|
268 |
} |
|
269 |
||
270 |
/** |
|
271 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
272 |
* See {@link #staticFieldOffset}. |
|
273 |
*/ |
|
274 |
@Deprecated |
|
275 |
public void putBoolean(Object o, int offset, boolean x) { |
|
276 |
putBoolean(o, (long)offset, x); |
|
277 |
} |
|
278 |
||
279 |
/** |
|
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* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
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* See {@link #staticFieldOffset}. |
|
282 |
*/ |
|
283 |
@Deprecated |
|
284 |
public byte getByte(Object o, int offset) { |
|
285 |
return getByte(o, (long)offset); |
|
286 |
} |
|
287 |
||
288 |
/** |
|
289 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
290 |
* See {@link #staticFieldOffset}. |
|
291 |
*/ |
|
292 |
@Deprecated |
|
293 |
public void putByte(Object o, int offset, byte x) { |
|
294 |
putByte(o, (long)offset, x); |
|
295 |
} |
|
296 |
||
297 |
/** |
|
298 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
299 |
* See {@link #staticFieldOffset}. |
|
300 |
*/ |
|
301 |
@Deprecated |
|
302 |
public short getShort(Object o, int offset) { |
|
303 |
return getShort(o, (long)offset); |
|
304 |
} |
|
305 |
||
306 |
/** |
|
307 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
308 |
* See {@link #staticFieldOffset}. |
|
309 |
*/ |
|
310 |
@Deprecated |
|
311 |
public void putShort(Object o, int offset, short x) { |
|
312 |
putShort(o, (long)offset, x); |
|
313 |
} |
|
314 |
||
315 |
/** |
|
316 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
317 |
* See {@link #staticFieldOffset}. |
|
318 |
*/ |
|
319 |
@Deprecated |
|
320 |
public char getChar(Object o, int offset) { |
|
321 |
return getChar(o, (long)offset); |
|
322 |
} |
|
323 |
||
324 |
/** |
|
325 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
326 |
* See {@link #staticFieldOffset}. |
|
327 |
*/ |
|
328 |
@Deprecated |
|
329 |
public void putChar(Object o, int offset, char x) { |
|
330 |
putChar(o, (long)offset, x); |
|
331 |
} |
|
332 |
||
333 |
/** |
|
334 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
335 |
* See {@link #staticFieldOffset}. |
|
336 |
*/ |
|
337 |
@Deprecated |
|
338 |
public long getLong(Object o, int offset) { |
|
339 |
return getLong(o, (long)offset); |
|
340 |
} |
|
341 |
||
342 |
/** |
|
343 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
344 |
* See {@link #staticFieldOffset}. |
|
345 |
*/ |
|
346 |
@Deprecated |
|
347 |
public void putLong(Object o, int offset, long x) { |
|
348 |
putLong(o, (long)offset, x); |
|
349 |
} |
|
350 |
||
351 |
/** |
|
352 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
353 |
* See {@link #staticFieldOffset}. |
|
354 |
*/ |
|
355 |
@Deprecated |
|
356 |
public float getFloat(Object o, int offset) { |
|
357 |
return getFloat(o, (long)offset); |
|
358 |
} |
|
359 |
||
360 |
/** |
|
361 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
362 |
* See {@link #staticFieldOffset}. |
|
363 |
*/ |
|
364 |
@Deprecated |
|
365 |
public void putFloat(Object o, int offset, float x) { |
|
366 |
putFloat(o, (long)offset, x); |
|
367 |
} |
|
368 |
||
369 |
/** |
|
370 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
371 |
* See {@link #staticFieldOffset}. |
|
372 |
*/ |
|
373 |
@Deprecated |
|
374 |
public double getDouble(Object o, int offset) { |
|
375 |
return getDouble(o, (long)offset); |
|
376 |
} |
|
377 |
||
378 |
/** |
|
379 |
* @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. |
|
380 |
* See {@link #staticFieldOffset}. |
|
381 |
*/ |
|
382 |
@Deprecated |
|
383 |
public void putDouble(Object o, int offset, double x) { |
|
384 |
putDouble(o, (long)offset, x); |
|
385 |
} |
|
386 |
||
387 |
// These work on values in the C heap. |
|
388 |
||
389 |
/** |
|
390 |
* Fetches a value from a given memory address. If the address is zero, or |
|
391 |
* does not point into a block obtained from {@link #allocateMemory}, the |
|
392 |
* results are undefined. |
|
393 |
* |
|
394 |
* @see #allocateMemory |
|
395 |
*/ |
|
396 |
public native byte getByte(long address); |
|
397 |
||
398 |
/** |
|
399 |
* Stores a value into a given memory address. If the address is zero, or |
|
400 |
* does not point into a block obtained from {@link #allocateMemory}, the |
|
401 |
* results are undefined. |
|
402 |
* |
|
403 |
* @see #getByte(long) |
|
404 |
*/ |
|
405 |
public native void putByte(long address, byte x); |
|
406 |
||
407 |
/** @see #getByte(long) */ |
|
408 |
public native short getShort(long address); |
|
409 |
/** @see #putByte(long, byte) */ |
|
410 |
public native void putShort(long address, short x); |
|
411 |
/** @see #getByte(long) */ |
|
412 |
public native char getChar(long address); |
|
413 |
/** @see #putByte(long, byte) */ |
|
414 |
public native void putChar(long address, char x); |
|
415 |
/** @see #getByte(long) */ |
|
416 |
public native int getInt(long address); |
|
417 |
/** @see #putByte(long, byte) */ |
|
418 |
public native void putInt(long address, int x); |
|
419 |
/** @see #getByte(long) */ |
|
420 |
public native long getLong(long address); |
|
421 |
/** @see #putByte(long, byte) */ |
|
422 |
public native void putLong(long address, long x); |
|
423 |
/** @see #getByte(long) */ |
|
424 |
public native float getFloat(long address); |
|
425 |
/** @see #putByte(long, byte) */ |
|
426 |
public native void putFloat(long address, float x); |
|
427 |
/** @see #getByte(long) */ |
|
428 |
public native double getDouble(long address); |
|
429 |
/** @see #putByte(long, byte) */ |
|
430 |
public native void putDouble(long address, double x); |
|
431 |
||
432 |
/** |
|
433 |
* Fetches a native pointer from a given memory address. If the address is |
|
434 |
* zero, or does not point into a block obtained from {@link |
|
435 |
* #allocateMemory}, the results are undefined. |
|
436 |
* |
|
437 |
* <p> If the native pointer is less than 64 bits wide, it is extended as |
|
438 |
* an unsigned number to a Java long. The pointer may be indexed by any |
|
439 |
* given byte offset, simply by adding that offset (as a simple integer) to |
|
440 |
* the long representing the pointer. The number of bytes actually read |
|
441 |
* from the target address maybe determined by consulting {@link |
|
442 |
* #addressSize}. |
|
443 |
* |
|
444 |
* @see #allocateMemory |
|
445 |
*/ |
|
446 |
public native long getAddress(long address); |
|
447 |
||
448 |
/** |
|
449 |
* Stores a native pointer into a given memory address. If the address is |
|
450 |
* zero, or does not point into a block obtained from {@link |
|
451 |
* #allocateMemory}, the results are undefined. |
|
452 |
* |
|
453 |
* <p> The number of bytes actually written at the target address maybe |
|
454 |
* determined by consulting {@link #addressSize}. |
|
455 |
* |
|
456 |
* @see #getAddress(long) |
|
457 |
*/ |
|
458 |
public native void putAddress(long address, long x); |
|
459 |
||
460 |
/// wrappers for malloc, realloc, free: |
|
461 |
||
462 |
/** |
|
463 |
* Allocates a new block of native memory, of the given size in bytes. The |
|
464 |
* contents of the memory are uninitialized; they will generally be |
|
465 |
* garbage. The resulting native pointer will never be zero, and will be |
|
466 |
* aligned for all value types. Dispose of this memory by calling {@link |
|
467 |
* #freeMemory}, or resize it with {@link #reallocateMemory}. |
|
468 |
* |
|
469 |
* @throws IllegalArgumentException if the size is negative or too large |
|
470 |
* for the native size_t type |
|
471 |
* |
|
472 |
* @throws OutOfMemoryError if the allocation is refused by the system |
|
473 |
* |
|
474 |
* @see #getByte(long) |
|
475 |
* @see #putByte(long, byte) |
|
476 |
*/ |
|
477 |
public native long allocateMemory(long bytes); |
|
478 |
||
479 |
/** |
|
480 |
* Resizes a new block of native memory, to the given size in bytes. The |
|
481 |
* contents of the new block past the size of the old block are |
|
482 |
* uninitialized; they will generally be garbage. The resulting native |
|
483 |
* pointer will be zero if and only if the requested size is zero. The |
|
484 |
* resulting native pointer will be aligned for all value types. Dispose |
|
485 |
* of this memory by calling {@link #freeMemory}, or resize it with {@link |
|
486 |
* #reallocateMemory}. The address passed to this method may be null, in |
|
487 |
* which case an allocation will be performed. |
|
488 |
* |
|
489 |
* @throws IllegalArgumentException if the size is negative or too large |
|
490 |
* for the native size_t type |
|
491 |
* |
|
492 |
* @throws OutOfMemoryError if the allocation is refused by the system |
|
493 |
* |
|
494 |
* @see #allocateMemory |
|
495 |
*/ |
|
496 |
public native long reallocateMemory(long address, long bytes); |
|
497 |
||
498 |
/** |
|
499 |
* Sets all bytes in a given block of memory to a fixed value |
|
500 |
* (usually zero). |
|
501 |
* |
|
502 |
* <p>This method determines a block's base address by means of two parameters, |
|
503 |
* and so it provides (in effect) a <em>double-register</em> addressing mode, |
|
504 |
* as discussed in {@link #getInt(Object,long)}. When the object reference is null, |
|
505 |
* the offset supplies an absolute base address. |
|
506 |
* |
|
507 |
* <p>The stores are in coherent (atomic) units of a size determined |
|
508 |
* by the address and length parameters. If the effective address and |
|
509 |
* length are all even modulo 8, the stores take place in 'long' units. |
|
510 |
* If the effective address and length are (resp.) even modulo 4 or 2, |
|
511 |
* the stores take place in units of 'int' or 'short'. |
|
512 |
* |
|
513 |
* @since 1.7 |
|
514 |
*/ |
|
515 |
public native void setMemory(Object o, long offset, long bytes, byte value); |
|
516 |
||
517 |
/** |
|
518 |
* Sets all bytes in a given block of memory to a fixed value |
|
519 |
* (usually zero). This provides a <em>single-register</em> addressing mode, |
|
520 |
* as discussed in {@link #getInt(Object,long)}. |
|
521 |
* |
|
522 |
* <p>Equivalent to <code>setMemory(null, address, bytes, value)</code>. |
|
523 |
*/ |
|
524 |
public void setMemory(long address, long bytes, byte value) { |
|
525 |
setMemory(null, address, bytes, value); |
|
526 |
} |
|
527 |
||
528 |
/** |
|
529 |
* Sets all bytes in a given block of memory to a copy of another |
|
530 |
* block. |
|
531 |
* |
|
532 |
* <p>This method determines each block's base address by means of two parameters, |
|
533 |
* and so it provides (in effect) a <em>double-register</em> addressing mode, |
|
534 |
* as discussed in {@link #getInt(Object,long)}. When the object reference is null, |
|
535 |
* the offset supplies an absolute base address. |
|
536 |
* |
|
537 |
* <p>The transfers are in coherent (atomic) units of a size determined |
|
538 |
* by the address and length parameters. If the effective addresses and |
|
539 |
* length are all even modulo 8, the transfer takes place in 'long' units. |
|
540 |
* If the effective addresses and length are (resp.) even modulo 4 or 2, |
|
541 |
* the transfer takes place in units of 'int' or 'short'. |
|
542 |
* |
|
543 |
* @since 1.7 |
|
544 |
*/ |
|
545 |
public native void copyMemory(Object srcBase, long srcOffset, |
|
546 |
Object destBase, long destOffset, |
|
547 |
long bytes); |
|
548 |
/** |
|
549 |
* Sets all bytes in a given block of memory to a copy of another |
|
550 |
* block. This provides a <em>single-register</em> addressing mode, |
|
551 |
* as discussed in {@link #getInt(Object,long)}. |
|
552 |
* |
|
553 |
* Equivalent to <code>copyMemory(null, srcAddress, null, destAddress, bytes)</code>. |
|
554 |
*/ |
|
555 |
public void copyMemory(long srcAddress, long destAddress, long bytes) { |
|
556 |
copyMemory(null, srcAddress, null, destAddress, bytes); |
|
557 |
} |
|
558 |
||
559 |
/** |
|
560 |
* Disposes of a block of native memory, as obtained from {@link |
|
561 |
* #allocateMemory} or {@link #reallocateMemory}. The address passed to |
|
562 |
* this method may be null, in which case no action is taken. |
|
563 |
* |
|
564 |
* @see #allocateMemory |
|
565 |
*/ |
|
566 |
public native void freeMemory(long address); |
|
567 |
||
568 |
/// random queries |
|
569 |
||
570 |
/** |
|
571 |
* This constant differs from all results that will ever be returned from |
|
572 |
* {@link #staticFieldOffset}, {@link #objectFieldOffset}, |
|
573 |
* or {@link #arrayBaseOffset}. |
|
574 |
*/ |
|
575 |
public static final int INVALID_FIELD_OFFSET = -1; |
|
576 |
||
577 |
/** |
|
578 |
* Returns the offset of a field, truncated to 32 bits. |
|
579 |
* This method is implemented as follows: |
|
580 |
* <blockquote><pre> |
|
581 |
* public int fieldOffset(Field f) { |
|
582 |
* if (Modifier.isStatic(f.getModifiers())) |
|
583 |
* return (int) staticFieldOffset(f); |
|
584 |
* else |
|
585 |
* return (int) objectFieldOffset(f); |
|
586 |
* } |
|
587 |
* </pre></blockquote> |
|
588 |
* @deprecated As of 1.4.1, use {@link #staticFieldOffset} for static |
|
589 |
* fields and {@link #objectFieldOffset} for non-static fields. |
|
590 |
*/ |
|
591 |
@Deprecated |
|
592 |
public int fieldOffset(Field f) { |
|
593 |
if (Modifier.isStatic(f.getModifiers())) |
|
594 |
return (int) staticFieldOffset(f); |
|
595 |
else |
|
596 |
return (int) objectFieldOffset(f); |
|
597 |
} |
|
598 |
||
599 |
/** |
|
600 |
* Returns the base address for accessing some static field |
|
601 |
* in the given class. This method is implemented as follows: |
|
602 |
* <blockquote><pre> |
|
603 |
* public Object staticFieldBase(Class c) { |
|
604 |
* Field[] fields = c.getDeclaredFields(); |
|
605 |
* for (int i = 0; i < fields.length; i++) { |
|
606 |
* if (Modifier.isStatic(fields[i].getModifiers())) { |
|
607 |
* return staticFieldBase(fields[i]); |
|
608 |
* } |
|
609 |
* } |
|
610 |
* return null; |
|
611 |
* } |
|
612 |
* </pre></blockquote> |
|
613 |
* @deprecated As of 1.4.1, use {@link #staticFieldBase(Field)} |
|
614 |
* to obtain the base pertaining to a specific {@link Field}. |
|
615 |
* This method works only for JVMs which store all statics |
|
616 |
* for a given class in one place. |
|
617 |
*/ |
|
618 |
@Deprecated |
|
11117
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diff
changeset
|
619 |
public Object staticFieldBase(Class<?> c) { |
2 | 620 |
Field[] fields = c.getDeclaredFields(); |
621 |
for (int i = 0; i < fields.length; i++) { |
|
622 |
if (Modifier.isStatic(fields[i].getModifiers())) { |
|
623 |
return staticFieldBase(fields[i]); |
|
624 |
} |
|
625 |
} |
|
626 |
return null; |
|
627 |
} |
|
628 |
||
629 |
/** |
|
630 |
* Report the location of a given field in the storage allocation of its |
|
631 |
* class. Do not expect to perform any sort of arithmetic on this offset; |
|
632 |
* it is just a cookie which is passed to the unsafe heap memory accessors. |
|
633 |
* |
|
634 |
* <p>Any given field will always have the same offset and base, and no |
|
635 |
* two distinct fields of the same class will ever have the same offset |
|
636 |
* and base. |
|
637 |
* |
|
638 |
* <p>As of 1.4.1, offsets for fields are represented as long values, |
|
639 |
* although the Sun JVM does not use the most significant 32 bits. |
|
640 |
* However, JVM implementations which store static fields at absolute |
|
641 |
* addresses can use long offsets and null base pointers to express |
|
642 |
* the field locations in a form usable by {@link #getInt(Object,long)}. |
|
643 |
* Therefore, code which will be ported to such JVMs on 64-bit platforms |
|
644 |
* must preserve all bits of static field offsets. |
|
645 |
* @see #getInt(Object, long) |
|
646 |
*/ |
|
647 |
public native long staticFieldOffset(Field f); |
|
648 |
||
649 |
/** |
|
650 |
* Report the location of a given static field, in conjunction with {@link |
|
651 |
* #staticFieldBase}. |
|
652 |
* <p>Do not expect to perform any sort of arithmetic on this offset; |
|
653 |
* it is just a cookie which is passed to the unsafe heap memory accessors. |
|
654 |
* |
|
655 |
* <p>Any given field will always have the same offset, and no two distinct |
|
656 |
* fields of the same class will ever have the same offset. |
|
657 |
* |
|
658 |
* <p>As of 1.4.1, offsets for fields are represented as long values, |
|
659 |
* although the Sun JVM does not use the most significant 32 bits. |
|
660 |
* It is hard to imagine a JVM technology which needs more than |
|
661 |
* a few bits to encode an offset within a non-array object, |
|
662 |
* However, for consistency with other methods in this class, |
|
663 |
* this method reports its result as a long value. |
|
664 |
* @see #getInt(Object, long) |
|
665 |
*/ |
|
666 |
public native long objectFieldOffset(Field f); |
|
667 |
||
668 |
/** |
|
669 |
* Report the location of a given static field, in conjunction with {@link |
|
670 |
* #staticFieldOffset}. |
|
671 |
* <p>Fetch the base "Object", if any, with which static fields of the |
|
672 |
* given class can be accessed via methods like {@link #getInt(Object, |
|
673 |
* long)}. This value may be null. This value may refer to an object |
|
674 |
* which is a "cookie", not guaranteed to be a real Object, and it should |
|
675 |
* not be used in any way except as argument to the get and put routines in |
|
676 |
* this class. |
|
677 |
*/ |
|
678 |
public native Object staticFieldBase(Field f); |
|
679 |
||
680 |
/** |
|
13423
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twisti
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11117
diff
changeset
|
681 |
* Detect if the given class may need to be initialized. This is often |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
682 |
* 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
|
683 |
* class. |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
684 |
* @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
|
685 |
*/ |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
686 |
public native boolean shouldBeInitialized(Class<?> c); |
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
687 |
|
17843fff200d
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
11117
diff
changeset
|
688 |
/** |
2 | 689 |
* Ensure the given class has been initialized. This is often |
690 |
* needed in conjunction with obtaining the static field base of a |
|
691 |
* class. |
|
692 |
*/ |
|
11117
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alanb
parents:
5506
diff
changeset
|
693 |
public native void ensureClassInitialized(Class<?> c); |
2 | 694 |
|
695 |
/** |
|
696 |
* Report the offset of the first element in the storage allocation of a |
|
697 |
* given array class. If {@link #arrayIndexScale} returns a non-zero value |
|
698 |
* for the same class, you may use that scale factor, together with this |
|
699 |
* base offset, to form new offsets to access elements of arrays of the |
|
700 |
* given class. |
|
701 |
* |
|
702 |
* @see #getInt(Object, long) |
|
703 |
* @see #putInt(Object, long, int) |
|
704 |
*/ |
|
11117
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7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)
alanb
parents:
5506
diff
changeset
|
705 |
public native int arrayBaseOffset(Class<?> arrayClass); |
2 | 706 |
|
707 |
/** The value of {@code arrayBaseOffset(boolean[].class)} */ |
|
708 |
public static final int ARRAY_BOOLEAN_BASE_OFFSET |
|
709 |
= theUnsafe.arrayBaseOffset(boolean[].class); |
|
710 |
||
711 |
/** The value of {@code arrayBaseOffset(byte[].class)} */ |
|
712 |
public static final int ARRAY_BYTE_BASE_OFFSET |
|
713 |
= theUnsafe.arrayBaseOffset(byte[].class); |
|
714 |
||
715 |
/** The value of {@code arrayBaseOffset(short[].class)} */ |
|
716 |
public static final int ARRAY_SHORT_BASE_OFFSET |
|
717 |
= theUnsafe.arrayBaseOffset(short[].class); |
|
718 |
||
719 |
/** The value of {@code arrayBaseOffset(char[].class)} */ |
|
720 |
public static final int ARRAY_CHAR_BASE_OFFSET |
|
721 |
= theUnsafe.arrayBaseOffset(char[].class); |
|
722 |
||
723 |
/** The value of {@code arrayBaseOffset(int[].class)} */ |
|
724 |
public static final int ARRAY_INT_BASE_OFFSET |
|
725 |
= theUnsafe.arrayBaseOffset(int[].class); |
|
726 |
||
727 |
/** The value of {@code arrayBaseOffset(long[].class)} */ |
|
728 |
public static final int ARRAY_LONG_BASE_OFFSET |
|
729 |
= theUnsafe.arrayBaseOffset(long[].class); |
|
730 |
||
731 |
/** The value of {@code arrayBaseOffset(float[].class)} */ |
|
732 |
public static final int ARRAY_FLOAT_BASE_OFFSET |
|
733 |
= theUnsafe.arrayBaseOffset(float[].class); |
|
734 |
||
735 |
/** The value of {@code arrayBaseOffset(double[].class)} */ |
|
736 |
public static final int ARRAY_DOUBLE_BASE_OFFSET |
|
737 |
= theUnsafe.arrayBaseOffset(double[].class); |
|
738 |
||
739 |
/** The value of {@code arrayBaseOffset(Object[].class)} */ |
|
740 |
public static final int ARRAY_OBJECT_BASE_OFFSET |
|
741 |
= theUnsafe.arrayBaseOffset(Object[].class); |
|
742 |
||
743 |
/** |
|
744 |
* Report the scale factor for addressing elements in the storage |
|
745 |
* allocation of a given array class. However, arrays of "narrow" types |
|
746 |
* will generally not work properly with accessors like {@link |
|
747 |
* #getByte(Object, int)}, so the scale factor for such classes is reported |
|
748 |
* as zero. |
|
749 |
* |
|
750 |
* @see #arrayBaseOffset |
|
751 |
* @see #getInt(Object, long) |
|
752 |
* @see #putInt(Object, long, int) |
|
753 |
*/ |
|
11117
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7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)
alanb
parents:
5506
diff
changeset
|
754 |
public native int arrayIndexScale(Class<?> arrayClass); |
2 | 755 |
|
756 |
/** The value of {@code arrayIndexScale(boolean[].class)} */ |
|
757 |
public static final int ARRAY_BOOLEAN_INDEX_SCALE |
|
758 |
= theUnsafe.arrayIndexScale(boolean[].class); |
|
759 |
||
760 |
/** The value of {@code arrayIndexScale(byte[].class)} */ |
|
761 |
public static final int ARRAY_BYTE_INDEX_SCALE |
|
762 |
= theUnsafe.arrayIndexScale(byte[].class); |
|
763 |
||
764 |
/** The value of {@code arrayIndexScale(short[].class)} */ |
|
765 |
public static final int ARRAY_SHORT_INDEX_SCALE |
|
766 |
= theUnsafe.arrayIndexScale(short[].class); |
|
767 |
||
768 |
/** The value of {@code arrayIndexScale(char[].class)} */ |
|
769 |
public static final int ARRAY_CHAR_INDEX_SCALE |
|
770 |
= theUnsafe.arrayIndexScale(char[].class); |
|
771 |
||
772 |
/** The value of {@code arrayIndexScale(int[].class)} */ |
|
773 |
public static final int ARRAY_INT_INDEX_SCALE |
|
774 |
= theUnsafe.arrayIndexScale(int[].class); |
|
775 |
||
776 |
/** The value of {@code arrayIndexScale(long[].class)} */ |
|
777 |
public static final int ARRAY_LONG_INDEX_SCALE |
|
778 |
= theUnsafe.arrayIndexScale(long[].class); |
|
779 |
||
780 |
/** The value of {@code arrayIndexScale(float[].class)} */ |
|
781 |
public static final int ARRAY_FLOAT_INDEX_SCALE |
|
782 |
= theUnsafe.arrayIndexScale(float[].class); |
|
783 |
||
784 |
/** The value of {@code arrayIndexScale(double[].class)} */ |
|
785 |
public static final int ARRAY_DOUBLE_INDEX_SCALE |
|
786 |
= theUnsafe.arrayIndexScale(double[].class); |
|
787 |
||
788 |
/** The value of {@code arrayIndexScale(Object[].class)} */ |
|
789 |
public static final int ARRAY_OBJECT_INDEX_SCALE |
|
790 |
= theUnsafe.arrayIndexScale(Object[].class); |
|
791 |
||
792 |
/** |
|
793 |
* Report the size in bytes of a native pointer, as stored via {@link |
|
794 |
* #putAddress}. This value will be either 4 or 8. Note that the sizes of |
|
795 |
* other primitive types (as stored in native memory blocks) is determined |
|
796 |
* fully by their information content. |
|
797 |
*/ |
|
798 |
public native int addressSize(); |
|
799 |
||
800 |
/** The value of {@code addressSize()} */ |
|
801 |
public static final int ADDRESS_SIZE = theUnsafe.addressSize(); |
|
802 |
||
803 |
/** |
|
804 |
* Report the size in bytes of a native memory page (whatever that is). |
|
805 |
* This value will always be a power of two. |
|
806 |
*/ |
|
807 |
public native int pageSize(); |
|
808 |
||
809 |
||
810 |
/// random trusted operations from JNI: |
|
811 |
||
812 |
/** |
|
813 |
* Tell the VM to define a class, without security checks. By default, the |
|
814 |
* class loader and protection domain come from the caller's class. |
|
815 |
*/ |
|
11117
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alanb
parents:
5506
diff
changeset
|
816 |
public native Class<?> defineClass(String name, byte[] b, int off, int len, |
b6e68b1344d4
7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)
alanb
parents:
5506
diff
changeset
|
817 |
ClassLoader loader, |
b6e68b1344d4
7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)
alanb
parents:
5506
diff
changeset
|
818 |
ProtectionDomain protectionDomain); |
2 | 819 |
|
11117
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7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)
alanb
parents:
5506
diff
changeset
|
820 |
public native Class<?> defineClass(String name, byte[] b, int off, int len); |
2 | 821 |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
822 |
/** |
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jrose
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|
823 |
* Define a class but do not make it known to the class loader or system dictionary. |
5a17df307cbc
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2
diff
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|
824 |
* <p> |
5a17df307cbc
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2
diff
changeset
|
825 |
* For each CP entry, the corresponding CP patch must either be null or have |
5a17df307cbc
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jrose
parents:
2
diff
changeset
|
826 |
* the a format that matches its tag: |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
2
diff
changeset
|
827 |
* <ul> |
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jrose
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2
diff
changeset
|
828 |
* <li>Integer, Long, Float, Double: the corresponding wrapper object type from java.lang |
5a17df307cbc
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jrose
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2
diff
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|
829 |
* <li>Utf8: a string (must have suitable syntax if used as signature or name) |
5a17df307cbc
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jrose
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|
830 |
* <li>Class: any java.lang.Class object |
5a17df307cbc
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|
831 |
* <li>String: any object (not just a java.lang.String) |
5a17df307cbc
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|
832 |
* <li>InterfaceMethodRef: (NYI) a method handle to invoke on that call site's arguments |
5a17df307cbc
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jrose
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diff
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|
833 |
* </ul> |
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jrose
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diff
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|
834 |
* @params hostClass context for linkage, access control, protection domain, and class loader |
5a17df307cbc
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jrose
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diff
changeset
|
835 |
* @params data bytes of a class file |
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
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2
diff
changeset
|
836 |
* @params cpPatches where non-null entries exist, they replace corresponding CP entries in data |
5a17df307cbc
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diff
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|
837 |
*/ |
11117
b6e68b1344d4
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alanb
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5506
diff
changeset
|
838 |
public native Class<?> defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches); |
2707
5a17df307cbc
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|
839 |
|
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jrose
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changeset
|
840 |
|
2 | 841 |
/** Allocate an instance but do not run any constructor. |
842 |
Initializes the class if it has not yet been. */ |
|
11117
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diff
changeset
|
843 |
public native Object allocateInstance(Class<?> cls) |
2 | 844 |
throws InstantiationException; |
845 |
||
846 |
/** Lock the object. It must get unlocked via {@link #monitorExit}. */ |
|
847 |
public native void monitorEnter(Object o); |
|
848 |
||
849 |
/** |
|
850 |
* Unlock the object. It must have been locked via {@link |
|
851 |
* #monitorEnter}. |
|
852 |
*/ |
|
853 |
public native void monitorExit(Object o); |
|
854 |
||
855 |
/** |
|
856 |
* Tries to lock the object. Returns true or false to indicate |
|
857 |
* whether the lock succeeded. If it did, the object must be |
|
858 |
* unlocked via {@link #monitorExit}. |
|
859 |
*/ |
|
860 |
public native boolean tryMonitorEnter(Object o); |
|
861 |
||
862 |
/** Throw the exception without telling the verifier. */ |
|
863 |
public native void throwException(Throwable ee); |
|
864 |
||
865 |
||
866 |
/** |
|
867 |
* Atomically update Java variable to <tt>x</tt> if it is currently |
|
868 |
* holding <tt>expected</tt>. |
|
869 |
* @return <tt>true</tt> if successful |
|
870 |
*/ |
|
871 |
public final native boolean compareAndSwapObject(Object o, long offset, |
|
872 |
Object expected, |
|
873 |
Object x); |
|
874 |
||
875 |
/** |
|
876 |
* Atomically update Java variable to <tt>x</tt> if it is currently |
|
877 |
* holding <tt>expected</tt>. |
|
878 |
* @return <tt>true</tt> if successful |
|
879 |
*/ |
|
880 |
public final native boolean compareAndSwapInt(Object o, long offset, |
|
881 |
int expected, |
|
882 |
int x); |
|
883 |
||
884 |
/** |
|
885 |
* Atomically update Java variable to <tt>x</tt> if it is currently |
|
886 |
* holding <tt>expected</tt>. |
|
887 |
* @return <tt>true</tt> if successful |
|
888 |
*/ |
|
889 |
public final native boolean compareAndSwapLong(Object o, long offset, |
|
890 |
long expected, |
|
891 |
long x); |
|
892 |
||
893 |
/** |
|
894 |
* Fetches a reference value from a given Java variable, with volatile |
|
895 |
* load semantics. Otherwise identical to {@link #getObject(Object, long)} |
|
896 |
*/ |
|
897 |
public native Object getObjectVolatile(Object o, long offset); |
|
898 |
||
899 |
/** |
|
900 |
* Stores a reference value into a given Java variable, with |
|
901 |
* volatile store semantics. Otherwise identical to {@link #putObject(Object, long, Object)} |
|
902 |
*/ |
|
903 |
public native void putObjectVolatile(Object o, long offset, Object x); |
|
904 |
||
905 |
/** Volatile version of {@link #getInt(Object, long)} */ |
|
906 |
public native int getIntVolatile(Object o, long offset); |
|
907 |
||
908 |
/** Volatile version of {@link #putInt(Object, long, int)} */ |
|
909 |
public native void putIntVolatile(Object o, long offset, int x); |
|
910 |
||
911 |
/** Volatile version of {@link #getBoolean(Object, long)} */ |
|
912 |
public native boolean getBooleanVolatile(Object o, long offset); |
|
913 |
||
914 |
/** Volatile version of {@link #putBoolean(Object, long, boolean)} */ |
|
915 |
public native void putBooleanVolatile(Object o, long offset, boolean x); |
|
916 |
||
917 |
/** Volatile version of {@link #getByte(Object, long)} */ |
|
918 |
public native byte getByteVolatile(Object o, long offset); |
|
919 |
||
920 |
/** Volatile version of {@link #putByte(Object, long, byte)} */ |
|
921 |
public native void putByteVolatile(Object o, long offset, byte x); |
|
922 |
||
923 |
/** Volatile version of {@link #getShort(Object, long)} */ |
|
924 |
public native short getShortVolatile(Object o, long offset); |
|
925 |
||
926 |
/** Volatile version of {@link #putShort(Object, long, short)} */ |
|
927 |
public native void putShortVolatile(Object o, long offset, short x); |
|
928 |
||
929 |
/** Volatile version of {@link #getChar(Object, long)} */ |
|
930 |
public native char getCharVolatile(Object o, long offset); |
|
931 |
||
932 |
/** Volatile version of {@link #putChar(Object, long, char)} */ |
|
933 |
public native void putCharVolatile(Object o, long offset, char x); |
|
934 |
||
935 |
/** Volatile version of {@link #getLong(Object, long)} */ |
|
936 |
public native long getLongVolatile(Object o, long offset); |
|
937 |
||
938 |
/** Volatile version of {@link #putLong(Object, long, long)} */ |
|
939 |
public native void putLongVolatile(Object o, long offset, long x); |
|
940 |
||
941 |
/** Volatile version of {@link #getFloat(Object, long)} */ |
|
942 |
public native float getFloatVolatile(Object o, long offset); |
|
943 |
||
944 |
/** Volatile version of {@link #putFloat(Object, long, float)} */ |
|
945 |
public native void putFloatVolatile(Object o, long offset, float x); |
|
946 |
||
947 |
/** Volatile version of {@link #getDouble(Object, long)} */ |
|
948 |
public native double getDoubleVolatile(Object o, long offset); |
|
949 |
||
950 |
/** Volatile version of {@link #putDouble(Object, long, double)} */ |
|
951 |
public native void putDoubleVolatile(Object o, long offset, double x); |
|
952 |
||
953 |
/** |
|
954 |
* Version of {@link #putObjectVolatile(Object, long, Object)} |
|
955 |
* that does not guarantee immediate visibility of the store to |
|
956 |
* other threads. This method is generally only useful if the |
|
957 |
* underlying field is a Java volatile (or if an array cell, one |
|
958 |
* that is otherwise only accessed using volatile accesses). |
|
959 |
*/ |
|
960 |
public native void putOrderedObject(Object o, long offset, Object x); |
|
961 |
||
962 |
/** Ordered/Lazy version of {@link #putIntVolatile(Object, long, int)} */ |
|
963 |
public native void putOrderedInt(Object o, long offset, int x); |
|
964 |
||
965 |
/** Ordered/Lazy version of {@link #putLongVolatile(Object, long, long)} */ |
|
966 |
public native void putOrderedLong(Object o, long offset, long x); |
|
967 |
||
968 |
/** |
|
969 |
* Unblock the given thread blocked on <tt>park</tt>, or, if it is |
|
970 |
* not blocked, cause the subsequent call to <tt>park</tt> not to |
|
971 |
* block. Note: this operation is "unsafe" solely because the |
|
972 |
* caller must somehow ensure that the thread has not been |
|
973 |
* destroyed. Nothing special is usually required to ensure this |
|
974 |
* when called from Java (in which there will ordinarily be a live |
|
975 |
* reference to the thread) but this is not nearly-automatically |
|
976 |
* so when calling from native code. |
|
977 |
* @param thread the thread to unpark. |
|
978 |
* |
|
979 |
*/ |
|
980 |
public native void unpark(Object thread); |
|
981 |
||
982 |
/** |
|
983 |
* Block current thread, returning when a balancing |
|
984 |
* <tt>unpark</tt> occurs, or a balancing <tt>unpark</tt> has |
|
985 |
* already occurred, or the thread is interrupted, or, if not |
|
986 |
* absolute and time is not zero, the given time nanoseconds have |
|
987 |
* elapsed, or if absolute, the given deadline in milliseconds |
|
988 |
* since Epoch has passed, or spuriously (i.e., returning for no |
|
989 |
* "reason"). Note: This operation is in the Unsafe class only |
|
990 |
* because <tt>unpark</tt> is, so it would be strange to place it |
|
991 |
* elsewhere. |
|
992 |
*/ |
|
993 |
public native void park(boolean isAbsolute, long time); |
|
994 |
||
995 |
/** |
|
996 |
* Gets the load average in the system run queue assigned |
|
997 |
* to the available processors averaged over various periods of time. |
|
998 |
* This method retrieves the given <tt>nelem</tt> samples and |
|
999 |
* assigns to the elements of the given <tt>loadavg</tt> array. |
|
1000 |
* The system imposes a maximum of 3 samples, representing |
|
1001 |
* averages over the last 1, 5, and 15 minutes, respectively. |
|
1002 |
* |
|
1003 |
* @params loadavg an array of double of size nelems |
|
1004 |
* @params nelems the number of samples to be retrieved and |
|
1005 |
* must be 1 to 3. |
|
1006 |
* |
|
1007 |
* @return the number of samples actually retrieved; or -1 |
|
1008 |
* if the load average is unobtainable. |
|
1009 |
*/ |
|
1010 |
public native int getLoadAverage(double[] loadavg, int nelems); |
|
14851 | 1011 |
|
14853
72f0bc58bb95
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diff
changeset
|
1012 |
// The following contain CAS-based Java implementations used on |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1013 |
// platforms not supporting native instructions |
72f0bc58bb95
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dl
parents:
14851
diff
changeset
|
1014 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1015 |
/** |
72f0bc58bb95
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dl
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14851
diff
changeset
|
1016 |
* Atomically adds the given value to the current value of a field |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1017 |
* or array element within the given object <code>o</code> |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
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diff
changeset
|
1018 |
* at the given <code>offset</code>. |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
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diff
changeset
|
1019 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1020 |
* @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
|
1021 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1022 |
* @param delta the value to add |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1023 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1024 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1025 |
*/ |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1026 |
public final int getAndAddInt(Object o, long offset, int delta) { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1027 |
int v; |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1028 |
do { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1029 |
v = getIntVolatile(o, offset); |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1030 |
} while (!compareAndSwapInt(o, offset, v, v + delta)); |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1031 |
return v; |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1032 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1033 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1034 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1035 |
* Atomically adds the given value to the current value of a field |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1036 |
* or array element within the given object <code>o</code> |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1037 |
* at the given <code>offset</code>. |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
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diff
changeset
|
1038 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1039 |
* @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
|
1040 |
* @param offset field/element offset |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1041 |
* @param delta the value to add |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1042 |
* @return the previous value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1043 |
* @since 1.8 |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1044 |
*/ |
72f0bc58bb95
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dl
parents:
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diff
changeset
|
1045 |
public final long getAndAddLong(Object o, long offset, long delta) { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1046 |
long v; |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1047 |
do { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1048 |
v = getLongVolatile(o, offset); |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
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diff
changeset
|
1049 |
} while (!compareAndSwapLong(o, offset, v, v + delta)); |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1050 |
return v; |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1051 |
} |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1052 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1053 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1054 |
* Atomically exchanges the given value with the current value of |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1055 |
* a field or array element within the given object <code>o</code> |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1056 |
* at the given <code>offset</code>. |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1057 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1058 |
* @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
|
1059 |
* @param offset field/element offset |
72f0bc58bb95
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dl
parents:
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diff
changeset
|
1060 |
* @param newValue new value |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1061 |
* @return the previous value |
72f0bc58bb95
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dl
parents:
14851
diff
changeset
|
1062 |
* @since 1.8 |
72f0bc58bb95
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dl
parents:
14851
diff
changeset
|
1063 |
*/ |
72f0bc58bb95
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dl
parents:
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diff
changeset
|
1064 |
public final int getAndSetInt(Object o, long offset, int newValue) { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1065 |
int v; |
72f0bc58bb95
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dl
parents:
14851
diff
changeset
|
1066 |
do { |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
14851
diff
changeset
|
1067 |
v = getIntVolatile(o, offset); |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
dl
parents:
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diff
changeset
|
1068 |
} while (!compareAndSwapInt(o, offset, v, newValue)); |
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|
1069 |
return v; |
72f0bc58bb95
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|
1070 |
} |
72f0bc58bb95
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changeset
|
1071 |
|
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1072 |
/** |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1073 |
* Atomically exchanges the given value with the current value of |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1074 |
* a field or array element within the given object <code>o</code> |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1075 |
* at the given <code>offset</code>. |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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|
1076 |
* |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1077 |
* @param o object/array to update the field/element in |
72f0bc58bb95
8004330: Add missing Unsafe entry points for addAndGet() family
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changeset
|
1078 |
* @param offset field/element offset |
72f0bc58bb95
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changeset
|
1079 |
* @param newValue new value |
72f0bc58bb95
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changeset
|
1080 |
* @return the previous value |
72f0bc58bb95
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changeset
|
1081 |
* @since 1.8 |
72f0bc58bb95
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changeset
|
1082 |
*/ |
72f0bc58bb95
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changeset
|
1083 |
public final long getAndSetLong(Object o, long offset, long newValue) { |
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|
1084 |
long v; |
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changeset
|
1085 |
do { |
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changeset
|
1086 |
v = getLongVolatile(o, offset); |
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changeset
|
1087 |
} while (!compareAndSwapLong(o, offset, v, newValue)); |
72f0bc58bb95
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parents:
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changeset
|
1088 |
return v; |
72f0bc58bb95
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changeset
|
1089 |
} |
72f0bc58bb95
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changeset
|
1090 |
|
72f0bc58bb95
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changeset
|
1091 |
/** |
72f0bc58bb95
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changeset
|
1092 |
* Atomically exchanges the given reference value with the current |
72f0bc58bb95
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changeset
|
1093 |
* reference value of a field or array element within the given |
72f0bc58bb95
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diff
changeset
|
1094 |
* object <code>o</code> at the given <code>offset</code>. |
72f0bc58bb95
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changeset
|
1095 |
* |
72f0bc58bb95
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diff
changeset
|
1096 |
* @param o object/array to update the field/element in |
72f0bc58bb95
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changeset
|
1097 |
* @param offset field/element offset |
72f0bc58bb95
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changeset
|
1098 |
* @param newValue new value |
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changeset
|
1099 |
* @return the previous value |
72f0bc58bb95
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parents:
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changeset
|
1100 |
* @since 1.8 |
72f0bc58bb95
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changeset
|
1101 |
*/ |
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changeset
|
1102 |
public final Object getAndSetObject(Object o, long offset, Object newValue) { |
72f0bc58bb95
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changeset
|
1103 |
Object v; |
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changeset
|
1104 |
do { |
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changeset
|
1105 |
v = getObjectVolatile(o, offset); |
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changeset
|
1106 |
} while (!compareAndSwapObject(o, offset, v, newValue)); |
72f0bc58bb95
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changeset
|
1107 |
return v; |
72f0bc58bb95
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changeset
|
1108 |
} |
72f0bc58bb95
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changeset
|
1109 |
|
72f0bc58bb95
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changeset
|
1110 |
|
14851 | 1111 |
/** |
1112 |
* Ensures lack of reordering of loads before the fence |
|
1113 |
* with loads or stores after the fence. |
|
14853
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changeset
|
1114 |
* @since 1.8 |
14851 | 1115 |
*/ |
1116 |
public native void loadFence(); |
|
1117 |
||
1118 |
/** |
|
1119 |
* Ensures lack of reordering of stores before the fence |
|
1120 |
* with loads or stores after the fence. |
|
14853
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changeset
|
1121 |
* @since 1.8 |
14851 | 1122 |
*/ |
1123 |
public native void storeFence(); |
|
1124 |
||
1125 |
/** |
|
1126 |
* Ensures lack of reordering of loads or stores before the fence |
|
1127 |
* with loads or stores after the fence. |
|
14853
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changeset
|
1128 |
* @since 1.8 |
14851 | 1129 |
*/ |
1130 |
public native void fullFence(); |
|
1131 |
||
2 | 1132 |
} |