pthread_cond_broadcast(3) - NetBSD Manual Pages

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PTHREAD_COND_BROADCA... NetBSD Library Functions ManualPTHREAD_COND_BROADCA...


NAME

     pthread_cond_broadcast, pthread_cond_signal -- unblock one or all threads
     waiting on a condition variable


LIBRARY

     POSIX Threads Library (libpthread, -lpthread)


SYNOPSIS

     #include <pthread.h>

     int
     pthread_cond_broadcast(pthread_cond_t *cond);

     int
     pthread_cond_signal(pthread_cond_t *cond);


DESCRIPTION

     The pthread_cond_broadcast() function unblocks all threads waiting for
     the condition variable cond.  If no threads are waiting on cond, the
     pthread_cond_broadcast() function has no effect.

     The pthread_cond_signal() function unblocks one thread waiting for the
     condition variable cond.  If no threads are waiting on cond, the
     pthread_cond_signal() function has no effect.

     When calling pthread_cond_wait() and/or pthread_cond_timedwait(), a tem-
     porary binding is established between the condition variable cond and a
     caller-supplied mutex.

     The same mutex must be held while calling pthread_cond_broadcast() and
     pthread_cond_signal().  Neither function enforces this requirement, but
     if the mutex is not held the resulting behaviour is undefined.


RETURN VALUES

     If successful, the pthread_cond_broadcast() and pthread_cond_signal()
     functions will return zero, otherwise an error number will be returned to
     indicate the error.


ERRORS

     pthread_cond_broadcast() and pthread_cond_signal() may fail if:

     [EINVAL]           The value specified by cond is invalid.


SEE ALSO

     pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_timedwait(3),
     pthread_cond_wait(3)


STANDARDS

     pthread_cond_broadcast() and pthread_cond_signal() conform to ISO/IEC
     9945-1:1996 (``POSIX.1'').

NetBSD 5.2.2                     May 26, 2008                     NetBSD 5.2.2