98 lines
3.1 KiB
Java
98 lines
3.1 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.opengl;
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import java.nio.ByteBuffer;
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import org.lwjgl.LWJGLException;
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import org.lwjgl.LWJGLUtil;
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/**
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*
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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abstract class PeerInfo {
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private final ByteBuffer handle;
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private Thread locking_thread; // Thread that has locked this PeerInfo
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private int lock_count;
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protected PeerInfo(ByteBuffer handle) {
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this.handle = handle;
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}
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private void lockAndInitHandle() throws LWJGLException {
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doLockAndInitHandle();
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}
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public final synchronized void unlock() throws LWJGLException {
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if (lock_count <= 0)
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throw new IllegalStateException("PeerInfo not locked!");
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if (Thread.currentThread() != locking_thread)
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throw new IllegalStateException("PeerInfo already locked by " + locking_thread);
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lock_count--;
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if (lock_count == 0) {
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doUnlock();
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locking_thread = null;
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notify();
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}
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}
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protected abstract void doLockAndInitHandle() throws LWJGLException;
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protected abstract void doUnlock() throws LWJGLException;
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public final synchronized ByteBuffer lockAndGetHandle() throws LWJGLException {
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Thread this_thread = Thread.currentThread();
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while (locking_thread != null && locking_thread != this_thread) {
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try {
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wait();
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} catch (InterruptedException e) {
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LWJGLUtil.log("Interrupted while waiting for PeerInfo lock: " + e);
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}
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}
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if (lock_count == 0) {
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locking_thread = this_thread;
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doLockAndInitHandle();
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}
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lock_count++;
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return getHandle();
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}
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protected final ByteBuffer getHandle() {
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return handle;
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}
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public void destroy() {
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}
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}
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