public static class J2SE14ReadWriteLock.ReadLock extends java.lang.Object implements Lock, java.io.Serializable
J2SE14ReadWriteLock.readLock()
.Modifier | Constructor and Description |
---|---|
protected |
ReadLock(J2SE14ReadWriteLock lock)
Constructor for use by subclasses
|
Modifier and Type | Method and Description |
---|---|
void |
lock()
Acquires the read lock.
|
void |
lockInterruptibly()
Acquires the read lock unless the current thread is
interrupted.
|
java.lang.String |
toString()
Returns a string identifying this lock, as well as its lock state.
|
boolean |
tryLock()
Acquires the read lock only if the write lock is not held by
another thread at the time of invocation.
|
void |
unlock()
Attempts to release this lock.
|
protected ReadLock(J2SE14ReadWriteLock lock)
lock
- the outer lock objectjava.lang.NullPointerException
- if the lock is nullpublic void lock()
Acquires the read lock if the write lock is not held by another thread and returns immediately.
If the write lock is held by another thread then the current thread becomes disabled for thread scheduling purposes and lies dormant until the read lock has been acquired.
public void lockInterruptibly() throws java.lang.InterruptedException
Acquires the read lock if the write lock is not held by another thread and returns immediately.
If the write 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 current thread:
InterruptedException
is thrown and the current
thread's interrupted status is cleared.
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.
java.lang.InterruptedException
- if the current thread is interruptedpublic boolean tryLock()
Acquires the read lock if the write lock is not held by
another thread and returns immediately with the value
true
. Even when this lock has been set to use a
fair ordering policy, a call to tryLock()
will immediately acquire the read lock if it is
available, whether or not other threads are currently
waiting for the read 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 write lock is held by another thread then
this method will return immediately with the value
false
.
public void unlock()
If the number of readers is now zero then the lock is made available for write lock attempts.
public java.lang.String toString()
"Read locks ="
followed by the number of held read locks.toString
in class java.lang.Object
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