102 lines
3.3 KiB
Groff
102 lines
3.3 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 9, 2010
|
|
.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 LIBRARY
|
|
.Lb libpthread
|
|
.Sh SYNOPSIS
|
|
.In 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 releases 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 reacquires the lock on
|
|
.Fa mutex .
|
|
.Pp
|
|
The clock used to measure
|
|
.Fa abstime
|
|
can be specified during creation of the condition variable using
|
|
.Xr pthread_condattr_setclock 3 .
|
|
.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
|
|
The
|
|
.Fn pthread_cond_timedwait
|
|
function 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 .
|
|
.It Bq Er EPERM
|
|
The specified
|
|
.Fa mutex
|
|
was not locked by the calling thread.
|
|
.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 ,
|
|
.Xr pthread_condattr_setclock 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn pthread_cond_timedwait
|
|
function conforms to
|
|
.St -p1003.1-96 .
|