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PTHREAD_COND_TIMEDWAI... BSD Library Functions Manual PTHREAD_COND_TIMEDWAI...


NAME

     pthread_cond_timedwait -- wait on a condition variable for a specific
     amount of time


SYNOPSIS

     #include <pthread.h>

     int
     pthread_cond_timedwait(pthread_cond_t *restrict cond,
         pthread_mutex_t *restrict mutex,
         const struct timespec *restrict abstime);


DESCRIPTION

     The pthread_cond_timedwait() function atomically blocks the current
     thread waiting on the condition variable specified by cond and unblocks
     the mutex specified by mutex.  The waiting thread unblocks only after
     another thread calls pthread_cond_signal(3), or pthread_cond_broadcast(3)
     with the same condition variable, or if the system time reaches the time
     specified in abstime, and the current thread reacquires the lock on
     mutex.

     Values for struct timespec can be obtained by adding the required time
     interval to the  the current time obtained using gettimeofday(2).

     Note that struct timeval and struct timespec use different units to spec-
     ify the time. Hence, the user should always take care to perform the time
     unit conversions accordingly.


EXAMPLE

        struct timeval tv;
        struct timespec ts;
        gettimeofday(&tv, NULL);
        ts.tv_sec = tv.tv_sec + 0;
        ts.tv_nsec = 0;


RETURN VALUES

     If successful, the pthread_cond_timedwait() function will return zero.
     Otherwise, an error number will be returned to indicate the error.


ERRORS

     pthread_cond_timedwait() will fail if:

     [EINVAL]           The value specified by cond, mutex or abstime is
                        invalid.

     [ETIMEDOUT]        The system time has reached or exceeded the time spec-
                        ified in abstime.


SEE ALSO

     pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3),
     pthread_cond_signal(3), pthread_cond_wait(3), gettimeofday(2)


STANDARDS

     pthread_cond_timedwait() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD                              July 28, 1998                             BSD

Mac OS X 10.8 - Generated Thu Aug 30 05:38:51 CDT 2012
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