diff options
Diffstat (limited to 'src/java/jogamp/common/util')
| -rw-r--r-- | src/java/jogamp/common/util/locks/RecursiveThreadGroupLockImpl01Unfairish.java | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/java/jogamp/common/util/locks/RecursiveThreadGroupLockImpl01Unfairish.java b/src/java/jogamp/common/util/locks/RecursiveThreadGroupLockImpl01Unfairish.java new file mode 100644 index 0000000..561ac61 --- /dev/null +++ b/src/java/jogamp/common/util/locks/RecursiveThreadGroupLockImpl01Unfairish.java @@ -0,0 +1,211 @@ +/** + * Copyright 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: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions 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. + * + * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * The views and conclusions contained in the software and documentation are those of the + * authors and should not be interpreted as representing official policies, either expressed + * or implied, of JogAmp Community. + */ +package jogamp.common.util.locks; + +import java.util.Arrays; + +import com.jogamp.common.util.locks.RecursiveThreadGroupLock; + +public class RecursiveThreadGroupLockImpl01Unfairish + extends RecursiveLockImpl01Unfairish + implements RecursiveThreadGroupLock +{ + /* package */ @SuppressWarnings("serial") + static class ThreadGroupSync extends SingleThreadSync { + /* package */ ThreadGroupSync() { + super(); + threadNum = 0; + threads = null; + holdCountAdditionOwner = 0; + } + public final void incrHoldCount(Thread t) { + super.incrHoldCount(t); + if(!isOriginalOwner(t)) { + holdCountAdditionOwner++; + } + } + public final void decrHoldCount(Thread t) { + super.decrHoldCount(t); + if(!isOriginalOwner(t)) { + holdCountAdditionOwner--; + } + } + public final int getAdditionalOwnerHoldCount() { + return holdCountAdditionOwner; + } + + public final boolean isOriginalOwner(Thread t) { + return super.isOwner(t); + } + public final boolean isOwner(Thread t) { + if(getExclusiveOwnerThread()==t) { + return true; + } + for(int i=threadNum-1; 0<=i; i--) { + if(threads[i]==t) { + return true; + } + } + return false; + } + + public final int getAddOwnerCount() { + return threadNum; + } + public final void addOwner(Thread t) throws IllegalArgumentException { + if(null == threads) { + if(threadNum>0) { + throw new InternalError("XXX"); + } + threads = new Thread[4]; + } + for(int i=threadNum-1; 0<=i; i--) { + if(threads[i]==t) { + throw new IllegalArgumentException("Thread already added: "+t); + } + } + if (threadNum == threads.length) { + threads = Arrays.copyOf(threads, threadNum * 2); + } + threads[threadNum] = t; + threadNum++; + } + + public final void removeAllOwners() { + for(int i=threadNum-1; 0<=i; i--) { + threads[i]=null; + } + threadNum=0; + } + + public final void removeOwner(Thread t) throws IllegalArgumentException { + for (int i = 0 ; i < threadNum ; i++) { + if (threads[i] == t) { + threadNum--; + System.arraycopy(threads, i + 1, threads, i, threadNum - i); + threads[threadNum] = null; // cleanup 'dead' [or duplicate] reference for GC + return; + } + } + throw new IllegalArgumentException("Not an owner: "+t); + } + + String addOwnerToString() { + StringBuffer sb = new StringBuffer(); + for(int i=0; i<threadNum; i++) { + if(i>0) { + sb.append(", "); + } + sb.append(threads[i].getName()); + } + return sb.toString(); + } + + // lock count by addition owner threads + private int holdCountAdditionOwner; + private Thread[] threads; + private int threadNum; + } + + public RecursiveThreadGroupLockImpl01Unfairish() { + super(new ThreadGroupSync()); + } + + public final boolean isOriginalOwner() { + return isOriginalOwner(Thread.currentThread()); + } + + public final boolean isOriginalOwner(Thread thread) { + synchronized(sync) { + return ((ThreadGroupSync)sync).isOriginalOwner(thread) ; + } + } + + public final void addOwner(Thread t) throws RuntimeException, IllegalArgumentException { + validateLocked(); + final Thread cur = Thread.currentThread(); + final ThreadGroupSync tgSync = (ThreadGroupSync)sync; + if(!tgSync.isOriginalOwner(cur)) { + throw new IllegalArgumentException("Current thread is not the original owner: orig-owner: "+tgSync.getOwner()+", current "+cur); + } + if(tgSync.isOriginalOwner(t)) { + throw new IllegalArgumentException("Passed thread is original owner: "+t); + } + tgSync.addOwner(t); + } + + public final void unlock(Runnable taskAfterUnlockBeforeNotify) { + synchronized(sync) { + final Thread cur = Thread.currentThread(); + final ThreadGroupSync tgSync = (ThreadGroupSync)sync; + + if( tgSync.getAddOwnerCount()>0 ) { + if(DEBUG) { + System.err.println("++ unlock(0): currentThread "+cur.getName()+", lock: "+this.toString()); + } + if( tgSync.isOriginalOwner(cur) ) { + // original locking owner thread + if( tgSync.getHoldCount() - tgSync.getAdditionalOwnerHoldCount() == 1 ) { + // release orig. lock + while ( tgSync.getAdditionalOwnerHoldCount() > 0 ) { + try { + sync.wait(); + } catch (InterruptedException e) { + // regular wake up! + } + } + tgSync.removeAllOwners(); + } + } else if( tgSync.getAdditionalOwnerHoldCount() == 1 ) { + // last additional owner thread wakes up original owner + final Thread originalOwner = tgSync.getOwner(); + if(originalOwner.getState() == Thread.State.WAITING) { + originalOwner.interrupt(); + } + } + } + if(DEBUG) { + System.err.println("++ unlock(X): currentThread "+cur.getName()+", lock: "+this.toString()); + } + super.unlock(taskAfterUnlockBeforeNotify); + } + } + + public final void removeOwner(Thread t) throws RuntimeException, IllegalArgumentException { + validateLocked(); + ((ThreadGroupSync)sync).removeOwner(t); + } + + public String toString() { + final ThreadGroupSync tgSync = (ThreadGroupSync)sync; + final int hc = sync.getHoldCount(); + final int addHC = tgSync.getAdditionalOwnerHoldCount(); + return syncName()+"[count "+hc+" [ add. "+addHC+", orig "+(hc-addHC)+ + "], qsz "+sync.getQSz()+", owner "+threadName(sync.getOwner())+", add.owner "+tgSync.addOwnerToString()+"]"; + } +} |