freebsd-dev/share/man/man3/pthread_cond_timedwait.3
Warner Losh e4adaf642c Document that EPERM is returned when the calling thread does not have
the mutex locked.  Also tweak the wording to make it more consistant
between pthread_cond_wait and pthread_cond_tiedwait.

Confirmed with the opengroup's web site that this is a valid return
value.  Wording used specifically not that of opengroup's online man
pages.

MFC After: 1 week
2007-03-30 04:10:04 +00:00

97 lines
3.1 KiB
Groff

.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
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.\" $FreeBSD$
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.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 LIBRARY
.Lb libpthread
.Lb libthr
.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 .
.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
.Sh STANDARDS
The
.Fn pthread_cond_timedwait
function conforms to
.St -p1003.1-96 .