java.lang.Object | ||
java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock | Serializable Lock |
The lock returned by method writeLock().
ReentrantReadWriteLock.WriteLock(ReentrantReadWriteLock lock) | ||||||
Constructor for use by subclasses. |
void | lock() | |||||
Acquire the lock. | ||||||
void | lockInterruptibly() | |||||
Acquires the lock unless the current thread is interrupted. | ||||||
Condition | newCondition() | |||||
Returns a Condition instance for use with this Lock instance. | ||||||
String | toString() | |||||
Returns a string identifying this lock, as well as its lock state. | ||||||
boolean | tryLock() | |||||
Acquires the lock only if it is not held by another thread at the time of invocation. | ||||||
boolean | tryLock(long timeout, TimeUnit unit) | |||||
Acquires the lock if it is not held by another thread within the given waiting time and the current thread has not been interrupted. | ||||||
void | unlock() | |||||
Attempts to release this lock. |
lock | the outer lock object |
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NullPointerException | if lock null |
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Acquires the lock if it is not held by another thread and returns immediately, setting the lock hold count to one.
If the current thread already holds the lock then the hold count is incremented by one and the method returns immediately.
If the lock is held by another thread then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired, at which time the lock hold count is set to one.
Acquires the lock if it is not held by another thread and returns immediately, setting the lock hold count to one.
If the current thread already holds this lock then the hold count is incremented by one and the method returns immediately.
If the lock is held by another thread then the current thread becomes disabled for thread scheduling purposes and lies dormant until one of two things happens:
If the lock is acquired by the current thread then the lock hold count is set to one.
If the current thread:
In this implementation, as this method is an explicit interruption point, preference is given to responding to the interrupt over normal or reentrant acquisition of the lock.
InterruptedException | if the current thread is interrupted |
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The returned Condition instance supports the same usages as do the Object monitor methods (wait, notify, and notifyAll) when used with the built-in monitor lock.
Acquires the lock if it is not held by another thread and returns immediately with the value true, setting the lock hold count to one. Even when this lock has been set to use a fair ordering policy, a call to tryLock() will immediately acquire the lock if it is available, whether or not other threads are currently waiting for the lock. This "barging" behavior can be useful in certain circumstances, even though it breaks fairness. If you want to honor the fairness setting for this lock, then use tryLock(0, TimeUnit.SECONDS) which is almost equivalent (it also detects interruption).
If the current thread already holds this lock then the hold count is incremented by one and the method returns true.
If the lock is held by another thread then this method will return immediately with the value false.
Acquires the lock if it is not held by another thread and returns immediately with the value true, setting the lock hold count to one. If this lock has been set to use a fair ordering policy then an available lock will not be acquired if any other threads are waiting for the lock. This is in contrast to the tryLock() method. If you want a timed tryLock that does permit barging on a fair lock then combine the timed and un-timed forms together:
if (lock.tryLock() || lock.tryLock(timeout, unit) ) { ... }
If the current thread already holds this lock then the hold count is incremented by one and the method returns true.
If the lock is held by another thread then the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happens:
If the lock is acquired then the value true is returned and the lock hold count is set to one.
If the current thread:
If the specified waiting time elapses then the value false is returned. If the time is less than or equal to zero, the method will not wait at all.
In this implementation, as this method is an explicit interruption point, preference is given to responding to the interrupt over normal or reentrant acquisition of the lock, and over reporting the elapse of the waiting time.
timeout | the time to wait for the lock |
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unit | the time unit of the timeout argument |
InterruptedException | if the current thread is interrupted |
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NullPointerException | if unit is null |
If the current thread is the holder of this lock then the hold count is decremented. If the hold count is now zero then the lock is released. If the current thread is not the holder of this lock then IllegalMonitorStateException is thrown.
IllegalMonitorStateException | if the current thread does not hold this lock. |
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Copyright 2007 Google Inc. | Build 0.9_r1-98467 - 14 Aug 2008 18:56 |