CountdownLatch
Related Docs:
object CountdownLatch
| package concurrent
Causes the current fiber to wait until the latch has counted down to zero
Returns the current count
Decrements the count of the latch, releasing all waiting fibers if the count reaches zero
A synchronization aid that allows one or more fibers to wait until a set of operations being performed in other fibers completes.
A
CountDownLatchis initialized with a given count. Theawaitmethod block until the current count reaches zero due to invocations of thecountDownmethod, after which all waiting fibers are released and any subsequent invocations ofawaitreturn immediately. This is a one-shot phenomenon -- the count cannot be reset. If you need a version that resets the count, consider using a CyclicBarrier.A
CountDownLatchis a versatile synchronization tool and can be used for a number of purposes. ACountDownLatchinitialized with a count of one serves as a simple on/off latch, or gate: all fibers invokingawaitwait at the gate until it is opened by a fiber invokingcountDown. ACountDownLatchinitialized to N can be used to make one fiber wait until N fibers have completed some action, or some action has been completed N times.A useful property of a
CountDownLatchis that it doesn't require that fibers callingcountDownwait for the count to reach zero before proceeding, it simply prevents any fiber from proceeding past anawaituntil all fibers could pass.