.\" $OpenBSD: pthread_cond_timedwait.3,v 1.6 2000/02/10 11:46:24 d Exp $ .\" Copyright (c) 1997 Brian Cully <shmit@kublai.com> .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the author nor the names of any co-contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD: pthread_cond_timedwait.3,v 1.6 1999/08/28 00:03:04 peter Exp $ .\" .Dd July 28, 1998 .Dt PTHREAD_COND_TIMEDWAIT 3 .Os .Sh NAME .Nm pthread_cond_timedwait .Nd "wait on a condition variable for a specific amount of time" .Sh SYNOPSIS .Fd #include <pthread.h> .Ft int .Fn pthread_cond_timedwait "pthread_cond_t *cond" "pthread_mutex_t *mutex" "const struct timespec *abstime" .Sh DESCRIPTION The .Fn pthread_cond_timedwait function atomically blocks the current thread waiting on the condition variable specified by .Fa cond , and unblocks the mutex specified by .Fa mutex . The waiting thread unblocks only after another thread calls .Xr pthread_cond_signal 3 , or .Xr pthread_cond_broadcast 3 with the same condition variable, or if the system time reaches the time specified in .Fa abstime , and the current thread reaquires the lock on .Fa mutex . .Sh RETURN VALUES If successful, the .Fn pthread_cond_timedwait function will return zero. Otherwise an error number will be returned to indicate the error. .Sh ERRORS .Fn pthread_cond_timedwait will fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa cond , .Fa mutex or .Fa abstime is invalid. .It Bq Er ETIMEDOUT The system time has reached or exceeded the time specified in .Fa abstime . .El .Sh SEE ALSO .Xr pthread_cond_broadcast 3 , .Xr pthread_cond_destroy 3 , .Xr pthread_cond_init 3 , .Xr pthread_cond_signal 3 , .Xr pthread_cond_wait 3 .Sh STANDARDS .Fn pthread_cond_timedwait conforms to ISO/IEC 9945-1 ANSI/IEEE .Pq Dq Tn POSIX Std 1003.1 Second Edition 1996-07-12.