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-.\" Copyright (c) 2008, David Xu <davidxu@FreeBSD.org>
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" Portions of this text are reprinted and reproduced in electronic form
-.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
-.\" Portable Operating System Interface (POSIX), The Open Group Base
-.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
-.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
-.\" event of any discrepancy between this version and the original IEEE and
-.\" The Open Group Standard, the original IEEE and The Open Group Standard is
-.\" the referee document.  The original Standard can be obtained online at
-.\"	http://www.opengroup.org/unix/online.html.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd March 3, 2008
-.Dt SEM_TIMEDWAIT 3
-.Os
-.Sh NAME
-.Nm sem_timedwait
-.Nd "lock a semaphore"
-.Sh LIBRARY
-.Lb libpthread
-.Sh SYNOPSIS
-.In semaphore.h
-.Ft int
-.Fn sem_timedwait "sem_t *sem" "const struct timespec *abs_timeout"
-.Sh DESCRIPTION
-The
-.Fn sem_timedwait
-function locks the semaphore referenced by
-.Fa sem ,
-as in the
-.Xr sem_wait 3
-function.
-However, if the semaphore cannot be locked without waiting for
-another process or thread to unlock the semaphore by performing
-a
-.Xr sem_post 3
-function, this wait will be terminated when the specified timeout expires.
-.Pp
-The timeout will expire when the absolute time specified by
-.Fa abs_timeout
-passes, as measured by the clock on which timeouts are based (that is,
-when the value of that clock equals or exceeds
-.Fa abs_timeout ) ,
-or if the
-absolute time specified by
-.Fa abs_timeout
-has already been passed at the time of the call.
-.Pp
-Note that the timeout is based on the
-.Dv CLOCK_REALTIME
-clock.
-.Pp
-The validity of the
-.Fa abs_timeout
-is not checked if the semaphore can be locked immediately.
-.Sh RETURN VALUES
-The
-.Fn sem_timedwait
-function returns zero if the calling process successfully performed the
-semaphore lock operation on the semaphore designated by
-.Fa sem .
-If the call was unsuccessful, the state of the semaphore is unchanged,
-and the function returns a value of \-1 and sets the global variable
-.Va errno
-to indicate the error.
-.Sh ERRORS
-The
-.Fn sem_timedwait
-function will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa sem
-argument does not refer to a valid semaphore, or the process or thread would
-have blocked, and the
-.Fa abs_timeout
-parameter specified a nanoseconds field value less than zero or greater than
-or equal to 1000 million.
-.It Bq Er ETIMEDOUT
-The semaphore could not be locked before the specified timeout expired.
-.It Bq Er EINTR
-A signal interrupted this function.
-.El
-.Sh SEE ALSO
-.Xr sem_post 3 ,
-.Xr sem_trywait 3 ,
-.Xr sem_wait 3 ,
-.Xr sem 4
-.Sh STANDARDS
-The
-.Fn sem_timedwait
-function conforms to
-.St -p1003.1-2004 .
-.Sh HISTORY
-The function first appeared in
-.Fx 5.0 .