freebsd-dev/lib/libc_r/man/pthread_cond_wait.3

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.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
.\" All rights reserved.
.\"
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.\" 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
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.\" $FreeBSD$
.\"
.Dd July 28, 1998
.Dt PTHREAD_COND_WAIT 3
.Os
.Sh NAME
.Nm pthread_cond_wait
.Nd wait on a condition variable
.Sh LIBRARY
.Lb libc_r
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_cond_wait "pthread_cond_t *cond" "pthread_mutex_t *mutex"
.Sh DESCRIPTION
The
.Fn pthread_cond_wait
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, and the current thread reacquires the lock
on
.Fa mutex .
.Sh RETURN VALUES
If successful, the
.Fn pthread_cond_wait
function will return zero.
Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
.Fn pthread_cond_wait
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa cond
or the value specified by
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.Fa mutex
is invalid.
.El
.Sh SEE ALSO
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.Xr pthread_cond_broadcast 3 ,
.Xr pthread_cond_destroy 3 ,
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.Xr pthread_cond_init 3 ,
.Xr pthread_cond_signal 3 ,
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.Xr pthread_cond_timedwait 3
.Sh STANDARDS
.Fn pthread_cond_wait
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conforms to
.St -p1003.1-96 .