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/**
* Copyright 2011 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 com.jogamp.common.util.locks;
/**
* Reentrance capable locking toolkit, supporting multiple threads as owner.
* <p>
* See use case description at {@link #addOwner(Thread)}.
* </p>
*/
public interface RecursiveThreadGroupLock extends RecursiveLock {
/**
* Returns true if the current thread is the original lock owner, ie.
* successfully claimed this lock the first time, ie. {@link #getHoldCount()} == 1.
*/
boolean isOriginalOwner();
/**
* Returns true if the passed thread is the original lock owner, ie.
* successfully claimed this lock the first time, ie. {@link #getHoldCount()} == 1.
*/
boolean isOriginalOwner(Thread thread);
/**
* Add a thread to the list of additional lock owners, which enables them to recursively claim this lock.
* <p>
* The caller must hold this lock and be the original lock owner, see {@link #isOriginalOwner()}.
* </p>
* <p>
* If the original owner releases this lock via {@link #unlock()}
* all additional lock owners are released as well.
* This ensures consistency of spawn off additional lock owner threads and it's release.
* </p>
* Use case:
* <pre>
* Thread2 thread2 = new Thread2();
*
* Thread1 {
*
* // Claim this lock and become the original lock owner.
* lock.lock();
*
* try {
*
* // Allow Thread2 to claim the lock, ie. make thread2 an additional lock owner
* addOwner(thread2);
*
* // Start thread2
* thread2.start();
*
* // Wait until thread2 has finished requiring this lock, but keep thread2 running
* while(!thread2.waitForResult()) sleep();
*
* // Optional: Only if sure that this thread doesn't hold the lock anymore,
* // otherwise just release the lock via unlock().
* removeOwner(thread2);
*
* } finally {
*
* // Release this lock and remove all additional lock owners.
* // Implicit wait until thread2 gets off the lock.
* lock.unlock();
*
* }
*
* }.start();
* </pre>
*
* @param t the thread to be added to the list of additional owning threads
* @throws RuntimeException if the current thread does not hold the lock.
* @throws IllegalArgumentException if the passed thread is the lock owner or already added.
*
* @see #removeOwner(Thread)
* @see #unlock()
* @see #lock()
*/
void addOwner(Thread t) throws RuntimeException, IllegalArgumentException;
/**
* Remove a thread from the list of additional lock owner threads.
* <p>
* The caller must hold this lock and be the original lock owner, see {@link #isOriginalOwner()}.
* </p>
* <p>
* Only use this method if sure that the thread doesn't hold the lock anymore.
* </p>
*
* @param t the thread to be removed from the list of additional owning threads
* @throws RuntimeException if the current thread does not hold the lock.
* @throws IllegalArgumentException if the passed thread is not added by {@link #addOwner(Thread)}
*/
void removeOwner(Thread t) throws RuntimeException, IllegalArgumentException;
/**
* <p>
* Wait's until all additional owners released this lock before releasing it.
* </p>
*
* {@inheritDoc}
*/
@Override
void unlock() throws RuntimeException;
/**
* <p>
* Wait's until all additional owners released this lock before releasing it.
* </p>
*
* {@inheritDoc}
*/
@Override
void unlock(Runnable taskAfterUnlockBeforeNotify);
}
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