java.lang.Object java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock
public static class ReentrantReadWriteLock.WriteLock
The lock returned by method ReentrantReadWriteLock.writeLock() .
Constructor Summary | |
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protected |
ReentrantReadWriteLock.WriteLock
(
ReentrantReadWriteLock
lock) Constructor for use by subclasses |
Method Summary | |
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void |
lock
() Acquire the write lock. |
void |
lockInterruptibly
() Acquires the write 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 write lock only if it is not held by another thread at the time of invocation. |
boolean |
tryLock
(long timeout,
TimeUnit
Acquires the write 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. |
Methods inherited from class java.lang. Object |
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clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait |
Constructor Detail |
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protected ReentrantReadWriteLock.WriteLock(ReentrantReadWriteLock lock)
Method Detail |
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public void lock()
Acquires the
write
lock if
neither the read nor write lock are
it is not
held by another thread and returns immediately, setting the
write
lock hold count to one.
If the current thread already holds the write 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 write lock has been acquired, at which time the write lock hold count is set to one.
public void lockInterruptibly() throws InterruptedException
Acquires the
write
lock if
neither the read nor write lock are
it is not
held by another thread and returns immediately, setting the
write
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 write 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.
public boolean tryLock()
Acquires the
write
lock if
neither the read nor write lock are
it is not
held by another thread and returns immediately with the value
true
, setting the
write
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
write
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 .
public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException
Acquires the
write
lock if
neither the read nor write lock are
it is not
held by another thread and returns immediately with the value
true
, setting the
write
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
write
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 write lock is acquired then the value true is returned and the write 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.
public void unlock()
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.
public Condition newCondition()
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.
public String toString()