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    PR_WaitSemaphore

    « NSPR API Reference « IPC Semaphores

    Returns the value of the environment variable.

    Syntax

    #include <pripcsem.h>
    
    NSPR_API(PRStatus) PR_WaitSemaphore(PRSem *sem);
    

    Parameter

    The function has the following parameter:

    sem
    A pointer to a PRSem structure returned from a call to PR_OpenSemaphore.

    Returns

    PRStatus

    Description

    PR_WaitSemaphore tests the value of the semaphore. If the value of the semaphore is > 0, the value of the semaphore is decremented and the function returns. If the value of the semaphore is 0, the function blocks until the value becomes > 0, then the semaphore is decremented and the function returns.

    The "test and decrement" operation is performed atomically.

    Document Tags and Contributors

    Contributors to this page: Rappo
    Last updated by: Rappo,