author | plevart |
Wed, 09 Mar 2016 21:17:06 +0100 | |
changeset 36435 | 0408881ad616 |
parent 33674 | 566777f73c32 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2009, 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.nio.fs; |
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import jdk.internal.misc.Unsafe; |
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/** |
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* Factory for native buffers. |
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*/ |
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class NativeBuffers { |
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private NativeBuffers() { } |
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private static final Unsafe unsafe = Unsafe.getUnsafe(); |
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private static final int TEMP_BUF_POOL_SIZE = 3; |
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private static ThreadLocal<NativeBuffer[]> threadLocal = |
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new ThreadLocal<NativeBuffer[]>(); |
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/** |
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* Allocates a native buffer, of at least the given size, from the heap. |
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*/ |
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static NativeBuffer allocNativeBuffer(int size) { |
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// Make a new one of at least 2k |
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if (size < 2048) size = 2048; |
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return new NativeBuffer(size); |
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} |
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/** |
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* Returns a native buffer, of at least the given size, from the thread |
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* local cache. |
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*/ |
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static NativeBuffer getNativeBufferFromCache(int size) { |
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// return from cache if possible |
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NativeBuffer[] buffers = threadLocal.get(); |
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if (buffers != null) { |
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for (int i=0; i<TEMP_BUF_POOL_SIZE; i++) { |
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NativeBuffer buffer = buffers[i]; |
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if (buffer != null && buffer.size() >= size) { |
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buffers[i] = null; |
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return buffer; |
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} |
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} |
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} |
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return null; |
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} |
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/** |
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* Returns a native buffer, of at least the given size. The native buffer |
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* is taken from the thread local cache if possible; otherwise it is |
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* allocated from the heap. |
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*/ |
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static NativeBuffer getNativeBuffer(int size) { |
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NativeBuffer buffer = getNativeBufferFromCache(size); |
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if (buffer != null) { |
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buffer.setOwner(null); |
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return buffer; |
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} else { |
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return allocNativeBuffer(size); |
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} |
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} |
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/** |
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* Releases the given buffer. If there is space in the thread local cache |
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* then the buffer goes into the cache; otherwise the memory is deallocated. |
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*/ |
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static void releaseNativeBuffer(NativeBuffer buffer) { |
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// create cache if it doesn't exist |
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NativeBuffer[] buffers = threadLocal.get(); |
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if (buffers == null) { |
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buffers = new NativeBuffer[TEMP_BUF_POOL_SIZE]; |
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buffers[0] = buffer; |
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threadLocal.set(buffers); |
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return; |
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} |
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// Put it in an empty slot if such exists |
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for (int i=0; i<TEMP_BUF_POOL_SIZE; i++) { |
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if (buffers[i] == null) { |
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buffers[i] = buffer; |
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return; |
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} |
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} |
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// Otherwise replace a smaller one in the cache if such exists |
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for (int i=0; i<TEMP_BUF_POOL_SIZE; i++) { |
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NativeBuffer existing = buffers[i]; |
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if (existing.size() < buffer.size()) { |
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existing.free(); |
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buffers[i] = buffer; |
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return; |
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} |
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} |
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// free it |
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buffer.free(); |
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} |
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/** |
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* Copies a byte array and zero terminator into a given native buffer. |
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*/ |
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static void copyCStringToNativeBuffer(byte[] cstr, NativeBuffer buffer) { |
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long offset = Unsafe.ARRAY_BYTE_BASE_OFFSET; |
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long len = cstr.length; |
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assert buffer.size() >= (len + 1); |
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unsafe.copyMemory(cstr, offset, null, buffer.address(), len); |
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unsafe.putByte(buffer.address() + len, (byte)0); |
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} |
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|
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/** |
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* Copies a byte array and zero terminator into a native buffer, returning |
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* the buffer. |
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*/ |
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static NativeBuffer asNativeBuffer(byte[] cstr) { |
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NativeBuffer buffer = getNativeBuffer(cstr.length+1); |
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copyCStringToNativeBuffer(cstr, buffer); |
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return buffer; |
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} |
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} |