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PTHREAD_COND_WAIT(3)     BSD Library Functions Manual     PTHREAD_COND_WAIT(3)

     pthread_cond_wait -- wait on a condition variable

     #include <pthread.h>

     pthread_cond_wait(pthread_cond_t *restrict cond, pthread_mutex_t *restrict mutex);

     The pthread_cond_wait() function atomically unlocks the mutex and blocks the current thread on the con-dition condition
     dition specified by the cond argument.  The current thread unblocks only after another thread calls
     pthread_cond_signal(3) or pthread_cond_broadcast(3) with the same condition variable.  The mutex must
     be locked before calling this function, otherwise the behavior is undefined. Before pthread_cond_wait()
     returns to the calling function, it re-acquires the mutex.

     If successful, the pthread_cond_wait() function will return zero; otherwise, an error number will be
     returned to indicate the error.

     pthread_cond_wait() will fail if:

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

     pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_signal(3),

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

Darwin                         November 5, 2001                         Darwin

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