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ReentrantReadWriteLock rwl = …;
ReentrantReadWriteLock.WriteLock l = rwl.writeLock();
Based on 27 examples
public static class ReentrantReadWriteLock.WriteLock extends Object implements Lock, Serializable
The lock returned by method {@link ReentrantReadWriteLock#writeLock}.
Constructor Summary | |
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protected |
Constructor for use by subclasses |
Method Summary | |
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int |
Queries the number of holds on this write lock by the current thread. |
boolean |
Queries if this write lock is held by the current thread. |
void |
lock() Acquires the write lock. |
void |
Acquires the write lock unless the current thread is java.lang.Thread.interrupt. |
Condition |
Returns a java.util.concurrent.locks.Condition instance for use with this java.util.concurrent.locks.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 |
Acquires the write lock if it is not held by another thread within the given waiting time and the current thread has not been java.lang.Thread.interrupt. |
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, toString, wait, wait, wait |
Constructor Detail |
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protected ReentrantReadWriteLock.WriteLock(ReentrantReadWriteLock lock)
lock
- the outer lock objectMethod Detail |
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public int getHoldCount()
public boolean isHeldByCurrentThread()
public void lock()
Acquires the write lock if neither the read nor write lock are 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 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.
InterruptedException
- if the current thread is interruptedpublic Condition newCondition()
The returned {@link Condition} instance supports the same usages as do the {@link Object} monitor methods ({@link Object#wait() wait}, {@link Object#notify notify}, and {@link Object#notifyAll notifyAll}) when used with the built-in monitor lock.
public String toString()
toString
in class Object
public boolean tryLock()
Acquires the write lock if neither the read nor write lock are held by another thread and returns immediately with the value {@code 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 {@code 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 {@link #tryLock(long, TimeUnit) 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 {@code true}.
If the lock is held by another thread then this method will return immediately with the value {@code false}.
public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException
Acquires the write lock if neither the read nor write lock are held by another thread and returns immediately with the value {@code 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 {@link #tryLock()} method. If you want a timed {@code 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 {@code 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 {@code 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 {@code 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 write lockunit
- the time unit of the timeout argumentInterruptedException
- if the current thread is interruptedpublic 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 {@link IllegalMonitorStateException} is thrown.
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