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  • java new synchronized

    java provides the synchronized keyword for synchronizing thread access to critical
    sections. Because it can be difficult to correctly write synchronized code that’s based on
    synchronized, high-level synchronizers are included in the concurrency utilities.
    A countdown latch causes one or more threads to wait at a “gate” until another
    thread opens this gate, at which point these other threads can continue. It consists of a
    count and operations for “causing a thread to wait until the count reaches zero” and
    “decrementing the count.”
    A cyclic barrier lets a set of threads wait for each other to reach a common barrier
    point. The barrier is cyclic because it can be reused after the waiting threads are released.
    This synchronizer is useful in applications involving a fixed-size party of threads that
    must occasionally wait for each other.
    An exchanger provides a synchronization point where threads can swap objects.
    Each thread presents some object on entry to the exchanger’s exchange() method,
    matches with a partner thread, and receives its partner’s object on return.
    A semaphore maintains a set of permits for restricting the number of threads that
    can access a limited resource. A thread attempting to acquire a permit when no permits
    are available blocks until some other thread releases a permit.
    A phaser is a more flexible cyclic barrier. Like a cyclic barrier, a phaser lets a group of
    threads wait on a barrier; these threads continue after the last thread arrives. A phaser also
    offers the equivalent of a barrier action. Unlike a cyclic barrier, which coordinates a fixed
    number of threads, a phaser can coordinate a variable number of threads, which can register
    at any time. To implement this capability, a phaser uses phases and phase numbers.
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  • 原文地址:https://www.cnblogs.com/rojas/p/5377309.html
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