1.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
2.\" All rights reserved.
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28.\" $FreeBSD: src/share/man/man3/pthread_cond_timedwait.3,v 1.21 2007/10/22 10:08:00 ru Exp $
29.\" $DragonFly: src/lib/libc_r/man/pthread_cond_timedwait.3,v 1.2 2003/06/17 04:26:48 dillon Exp $
30.\"
31.Dd July 10, 2009
32.Dt PTHREAD_COND_TIMEDWAIT 3
33.Os
34.Sh NAME
35.Nm pthread_cond_timedwait
36.Nd "wait on a condition variable for a specific amount of time"
37.Sh LIBRARY
38.Lb libpthread
39.Sh SYNOPSIS
40.In pthread.h
41.Ft int
42.Fn pthread_cond_timedwait "pthread_cond_t *cond" "pthread_mutex_t *mutex" "const struct timespec *abstime"
43.Sh DESCRIPTION
44The
45.Fn pthread_cond_timedwait
46function atomically blocks the current thread waiting on the condition
47variable specified by
48.Fa cond ,
49and releases the mutex specified by
50.Fa mutex .
51The waiting thread unblocks only after another thread calls
52.Xr pthread_cond_signal 3 ,
53or
54.Xr pthread_cond_broadcast 3
55with the same condition variable, or if the system time reaches the
56time specified in
57.Fa abstime ,
58and the current thread reacquires the lock on
59.Fa mutex .
60.Sh RETURN VALUES
61If successful, the
62.Fn pthread_cond_timedwait
63function will return zero.
64Otherwise an error number will be returned to
65indicate the error.
66.Sh ERRORS
67The
68.Fn pthread_cond_timedwait
69function will fail if:
70.Bl -tag -width Er
71.It Bq Er EINVAL
72The value specified by
73.Fa cond ,
74.Fa mutex
75or
76.Fa abstime
77is invalid.
78.It Bq Er ETIMEDOUT
79The system time has reached or exceeded the time specified in
80.Fa abstime .
81.\".It Bq Er EPERM
82.\"The specified
83.\".Fa mutex
84.\"was not locked by the calling thread.
85.El
86.Sh SEE ALSO
87.Xr pthread_cond_broadcast 3 ,
88.Xr pthread_cond_destroy 3 ,
89.Xr pthread_cond_init 3 ,
90.Xr pthread_cond_signal 3 ,
91.Xr pthread_cond_wait 3
92.Sh STANDARDS
93The
94.Fn pthread_cond_timedwait
95function conforms to
96.St -p1003.1-96 .
97