NAME
pthread_cond_wait —
wait on a condition variable
LIBRARY
library “libpthread”
SYNOPSIS
#include
<pthread.h>
int
pthread_cond_wait(pthread_cond_t
*restrict cond,
pthread_mutex_t *restrict
mutex);
DESCRIPTION
Thepthread_cond_wait()
function atomically blocks the current thread waiting on the condition
variable specified by cond, and releases 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, and
the current thread reacquires the lock on mutex.
RETURN VALUES
If successful, the pthread_cond_wait()
function will return zero. Otherwise an error number will be returned to
indicate the error.
ERRORS
The pthread_cond_wait() function will fail
if:
- [
EINVAL] - The value specified by cond or the value specified by mutex is invalid.
- [
EPERM] - The specified mutex was not locked by the calling thread.
- [
EOWNERDEAD] - The argument mutex points to a robust mutex and the previous owning thread terminated while holding the mutex lock. The lock was granted to the caller and it is up to the new owner to make the state consistent.
- [
ENOTRECOVERABLE] - The state protected by the mutex is not recoverable.
SEE ALSO
pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_signal(3), pthread_cond_timedwait(3), pthread_mutex_consistent(3)
STANDARDS
The pthread_cond_wait() function conforms
to ISO/IEC 9945-1:1996
(“POSIX.1”).