diff options
Diffstat (limited to 'src/jogl/classes/jogamp/opengl/GLContextLock.java')
-rw-r--r-- | src/jogl/classes/jogamp/opengl/GLContextLock.java | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/src/jogl/classes/jogamp/opengl/GLContextLock.java b/src/jogl/classes/jogamp/opengl/GLContextLock.java deleted file mode 100644 index f725508d8..000000000 --- a/src/jogl/classes/jogamp/opengl/GLContextLock.java +++ /dev/null @@ -1,157 +0,0 @@ -/* - * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved. - * Copyright (c) 2010 JogAmp Community. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * - Redistribution of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * - Redistribution in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * Neither the name of Sun Microsystems, Inc. or the names of - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * This software is provided "AS IS," without a warranty of any kind. ALL - * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, - * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A - * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN - * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR - * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR - * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR - * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR - * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE - * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, - * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF - * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. - * - * You acknowledge that this software is not designed or intended for use - * in the design, construction, operation or maintenance of any nuclear - * facility. - * - * Sun gratefully acknowledges that this software was originally authored - * and developed by Kenneth Bradley Russell and Christopher John Kline. - */ - -package jogamp.opengl; - -import javax.media.opengl.*; - -/** Implements the makeCurrent / release locking behavior of the - GLContext class. When "fail fast mode" is enabled, attempts to - lock the same GLContextLock on more than one thread cause - GLException to be raised. This lock is not recursive. Attempts to - lock it more than once on a given thread will cause GLException to - be raised. */ - -public class GLContextLock { - protected static final boolean DEBUG = GLContextImpl.DEBUG; - - static class SyncData { - boolean failFastMode = true; - Thread owner = null; - int waiters = 0; - Exception lockedStack = null; // only enabled if DEBUG - } - private SyncData sdata = new SyncData(); // synchronized (flow/mem) mutable access - - /** Locks this GLContextLock on the current thread. If fail fast - mode is enabled and the GLContextLock is already owned by - another thread, throws GLException. */ - public final void lock() throws GLException { - synchronized(sdata) { - Thread current = Thread.currentThread(); - if (sdata.owner == null) { - sdata.owner = current; - if(DEBUG) { - sdata.lockedStack = new Exception("Error: Previously made current (1) by "+sdata.owner+", lock: "+this); - } - } else if (sdata.owner != current) { - while (sdata.owner != null) { - if (sdata.failFastMode) { - if(null!=sdata.lockedStack) { - sdata.lockedStack.printStackTrace(); - } - throw new GLException("Error: Attempt to make context current on thread " + current + - " which is already current on thread " + sdata.owner); - } else { - try { - ++sdata.waiters; - sdata.wait(); - } catch (InterruptedException e) { - throw new GLException(e); - } finally { - --sdata.waiters; - } - } - } - sdata.owner = current; - if(DEBUG) { - sdata.lockedStack = new Exception("Previously made current (2) by "+sdata.owner+", lock: "+this); - } - } else { - throw new GLException("Attempt to make the same context current twice on thread " + current); - } - } - } - - /** Unlocks this GLContextLock. */ - public final void unlock() throws GLException { - synchronized (sdata) { - Thread current = Thread.currentThread(); - if (sdata.owner == current) { - sdata.owner = null; - sdata.lockedStack = null; - // Assuming notify() implementation weaks up the longest waiting thread, to avoid starvation. - // Otherwise we would need to have a Thread queue implemented, using sleep(timeout) and interrupt. - sdata.notify(); - } else { - if (sdata.owner != null) { - throw new GLException("Attempt by thread " + current + - " to release context owned by thread " + sdata.owner); - } else { - throw new GLException("Attempt by thread " + current + - " to release unowned context"); - } - } - } - } - - /** Indicates whether this lock is held by the current thread. */ - public final boolean isHeld() { - synchronized(sdata) { - return (Thread.currentThread() == sdata.owner); - } - } - - public final void setFailFastMode(boolean onOrOff) { - synchronized(sdata) { - sdata.failFastMode = onOrOff; - } - } - - public final boolean getFailFastMode() { - synchronized(sdata) { - return sdata.failFastMode; - } - } - - public final boolean hasWaiters() { - synchronized(sdata) { - return (0 != sdata.waiters); - } - } - - /** holding the owners stack trace when lock is acquired and DEBUG is true */ - public final Exception getLockedStack() { - synchronized(sdata) { - return sdata.lockedStack; - } - } - -} |