PTHREAD_COND_TIMEDWAI... BSD Library Functions Manual PTHREAD_COND_TIMEDWAI...NAMEpthread_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.
ERRORSpthread_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 ALSOpthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3),
pthread_cond_signal(3), pthread_cond_wait(3), gettimeofday(2)STANDARDSpthread_cond_timedwait() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
BSD July 28, 1998 BSD
