- All Implemented Interfaces:
- Enclosing class:
static final class Semaphore.FairSync
- extends Semaphore.Sync
Attempts to acquire in shared mode.
|Methods inherited from class java.util.concurrent.locks.AbstractQueuedSynchronizer
acquire, acquireInterruptibly, acquireShared, acquireSharedInterruptibly, compareAndSetState, getExclusiveQueuedThreads, getFirstQueuedThread, getQueuedThreads, getQueueLength, getSharedQueuedThreads, getState, getWaitingThreads, getWaitQueueLength, hasContended, hasQueuedThreads, hasWaiters, isHeldExclusively, isQueued, owns, release, releaseShared, setState, toString, tryAcquire, tryAcquireNanos, tryAcquireSharedNanos, tryRelease
protected int tryAcquireShared(int acquires)
- Description copied from class:
- Attempts to acquire in shared mode. This method should query if
the state of the object permits it to be acquired in the shared
mode, and if so to acquire it.
This method is always invoked by the thread performing
acquire. If this method reports failure, the acquire method
may queue the thread, if it is not already queued, until it is
signalled by a release from some other thread.
The default implementation throws
tryAcquireShared in class
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
- a negative value on failure, zero on exclusive success,
and a positive value if non-exclusively successful, in which
case a subsequent waiting thread must check
availability. (Support for three different return values
enables this method to be used in contexts where acquires only
sometimes act exclusively.) Upon success, this object has been
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