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/**
* 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()+"]";
}
}
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