PR_CWait ======== Wait for a notification that a monitor's state has changed. Syntax ------ .. code:: #include <prcmon.h> PRStatus PR_CWait( void *address, PRIntervalTime timeout); Parameters ~~~~~~~~~~ The function has the following parameters: ``address`` The address of the protected object--the same address previously passed to :ref:`PR_CEnterMonitor`. ``timeout`` The amount of time (in :ref:`PRIntervalTime` units) that the thread is willing to wait for an explicit notification before being rescheduled. If you specify ``PR_INTERVAL_NO_TIMEOUT``, the function returns if and only if the object is notified. Returns ~~~~~~~ The function returns one of the following values: - :ref:`PR_SUCCESS` indicates either that the monitored object has been notified or that the interval specified in the timeout parameter has been exceeded. - :ref:`PR_FAILURE` indicates either that the monitor could not be located in the cache or that the monitor was located and the calling thread was not the thread that held the monitor's mutex. Description ----------- Using the value specified in the ``address`` parameter to find a monitor in the monitor cache, :ref:`PR_CWait` waits for a notification that the monitor's state has changed. While the thread is waiting, it exits the monitor (just as if it had called :ref:`PR_CExitMonitor` as many times as it had called :ref:`PR_CEnterMonitor`). When the wait has finished, the thread regains control of the monitor's lock with the same entry count as before the wait began. The thread waiting on the monitor resumes execution when the monitor is notified (assuming the thread is the next in line to receive the notify) or when the interval specified in the ``timeout`` parameter has been exceeded. When the thread resumes execution, it is the caller's responsibility to test the state of the monitored data to determine the appropriate action.