jdk.util.concurrent.locks.ReentrantReadWriteLock$ReadLock
The lock returned by method ReentrantReadWriteLock.readLock().
The lock returned by method ReentrantReadWriteLock.readLock().
lockclj
(lock this)Acquires the read 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.
Acquires the read 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.
lock-interruptiblyclj
(lock-interruptibly this)Acquires the read lock unless the current thread is interrupted.
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:
The read lock is acquired by the current thread; or
Some other thread interrupts the current thread.
If the current thread:
has its interrupted status set on entry to this method; or
is interrupted while acquiring the read lock,
then 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.
throws: java.lang.InterruptedException - if the current thread is interrupted
Acquires the read lock unless the current thread is interrupted. 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: The read lock is acquired by the current thread; or Some other thread interrupts the current thread. If the current thread: has its interrupted status set on entry to this method; or is interrupted while acquiring the read lock, then 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. throws: java.lang.InterruptedException - if the current thread is interrupted
new-conditionclj
(new-condition this)Throws UnsupportedOperationException because ReadLocks do not support conditions.
returns: A new Condition instance for this Lock instance - java.util.concurrent.locks.Condition
throws: java.lang.UnsupportedOperationException - always
Throws UnsupportedOperationException because ReadLocks do not support conditions. returns: A new Condition instance for this Lock instance - `java.util.concurrent.locks.Condition` throws: java.lang.UnsupportedOperationException - always
to-stringclj
(to-string this)Returns a string identifying this lock, as well as its lock state. The state, in brackets, includes the String "Read locks =" followed by the number of held read locks.
returns: a string identifying this lock, as well as its lock state - java.lang.String
Returns a string identifying this lock, as well as its lock state. The state, in brackets, includes the String "Read locks =" followed by the number of held read locks. returns: a string identifying this lock, as well as its lock state - `java.lang.String`
try-lockclj
(try-lock this)(try-lock this timeout unit)Acquires the read lock if the write lock is not held by another thread within the given waiting time and the current thread has not been interrupted.
Acquires the read lock if the write lock is not held by another thread and returns immediately with the value true. 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 write 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:
The read lock is acquired by the current thread; or
Some other thread interrupts the current thread; or
The specified waiting time elapses.
If the read lock is acquired then the value true is returned.
If the current thread:
has its interrupted status set on entry to this method; or
is interrupted while acquiring the read lock,
then InterruptedException is thrown and the current thread's interrupted status is cleared.
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 read lock - long
unit - the time unit of the timeout argument - java.util.concurrent.TimeUnit
returns: true if the read lock was acquired - boolean
throws: java.lang.InterruptedException - if the current thread is interrupted
Acquires the read lock if the write lock is not held by
another thread within the given waiting time and the
current thread has not been interrupted.
Acquires the read lock if the write lock is not held by
another thread and returns immediately with the value
true. 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 write 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:
The read lock is acquired by the current thread; or
Some other thread interrupts
the current thread; or
The specified waiting time elapses.
If the read lock is acquired then the value true is
returned.
If the current thread:
has its interrupted status set on entry to this method; or
is interrupted while
acquiring the read lock,
then InterruptedException is thrown and the
current thread's interrupted status is cleared.
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 read lock - `long`
unit - the time unit of the timeout argument - `java.util.concurrent.TimeUnit`
returns: true if the read lock was acquired - `boolean`
throws: java.lang.InterruptedException - if the current thread is interruptedunlockclj
(unlock this)Attempts to release this lock.
If the number of readers is now zero then the lock is made available for write lock attempts.
Attempts to release this lock. If the number of readers is now zero then the lock is made available for write lock attempts.
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