java.util.concurrent.locks
Class ReentrantLock.FairSync

java.lang.Object
  java.util.concurrent.locks.AbstractQueuedSynchronizer
      java.util.concurrent.locks.ReentrantLock.Sync
          java.util.concurrent.locks.ReentrantLock.FairSync

All Implemented Interfaces:

Serializable

Enclosing class:

ReentrantLock

static final class ReentrantLock.FairSync
extends ReentrantLock.Sync

Sync object for fair locks

Nested Class Summary

Nested classes/interfaces inherited from class java.util.concurrent.locks.AbstractQueuedSynchronizer

AbstractQueuedSynchronizer.ConditionObject, AbstractQueuedSynchronizer.Node

Field Summary

Fields inherited from class java.util.concurrent.locks.ReentrantLock.Sync

owner

Constructor Summary

ReentrantLock.FairSync()

Method Summary

(package private) void	lock() Perform Lock.lock().
protected boolean	tryAcquire(int acquires) Fair version of tryAcquire.

Methods inherited from class java.util.concurrent.locks.ReentrantLock.Sync

getHoldCount, getOwner, isHeldExclusively, isLocked, newCondition, nonfairTryAcquire, tryRelease

Methods inherited from class java.util.concurrent.locks.AbstractQueuedSynchronizer

acquire, acquireInterruptibly, acquireQueued, acquireShared, acquireSharedInterruptibly, compareAndSetState, fullyRelease, getExclusiveQueuedThreads, getFirstQueuedThread, getQueuedThreads, getQueueLength, getSharedQueuedThreads, getState, getWaitingThreads, getWaitQueueLength, hasContended, hasQueuedThreads, hasWaiters, isOnSyncQueue, isQueued, owns, release, releaseShared, setState, toString, transferAfterCancelledWait, transferForSignal, tryAcquireNanos, tryAcquireShared, tryAcquireSharedNanos, tryReleaseShared

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ReentrantLock.FairSync

ReentrantLock.FairSync()

Method Detail

lock

final void lock()

Description copied from class: ReentrantLock.Sync

Perform Lock.lock(). The main reason for subclassing is to allow fast path for nonfair version.

Specified by:

lock in class ReentrantLock.Sync

tryAcquire

protected final boolean tryAcquire(int acquires)

Fair version of tryAcquire. Don't grant access unless recursive call or no waiters or is first.

Overrides:

tryAcquire in class AbstractQueuedSynchronizer

Parameters:

acquires - the acquire argument. This value is always the one passed to an acquire method, or is the value saved on entry to a condition wait. The value is otherwise uninterpreted and can represent anything you like.

Returns:

true if successful. Upon success, this object has been acquired.