pthread_cond_signal(3)
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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 5.0.1 May 26, 2008 NetBSD 5.0.1
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