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+.\" $OpenBSD: pthread_condattr_init.3,v 1.3 2025/06/07 00:16:52 schwarze Exp $
+.\"
+.\" Copyright (C) 2000 Jason Evans <jasone@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(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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: pthread_mutexattr.3,v 1.5 2001/07/15 07:53:26 dd Exp $
+.Dd $Mdocdate: June 7 2025 $
+.Dt PTHREAD_CONDATTR_INIT 3
+.Os
+.Sh NAME
+.Nm pthread_condattr_init ,
+.Nm pthread_condattr_destroy ,
+.Nm pthread_condattr_setclock ,
+.Nm pthread_condattr_getclock
+.Nd condition variable attribute operations
+.Sh SYNOPSIS
+.Lb libpthread
+.In pthread.h
+.Ft int
+.Fn pthread_condattr_init "pthread_condattr_t *attr"
+.Ft int
+.Fn pthread_condattr_destroy "pthread_condattr_t *attr"
+.Ft int
+.Fn pthread_condattr_setclock "pthread_condattr_t *attr" "clockid_t clock_id"
+.Ft int
+.Fn pthread_condattr_getclock "pthread_condattr_t *attr" "clockid_t *clock_id"
+.Sh DESCRIPTION
+Condition variable attributes are used to specify parameters to
+.Fn pthread_cond_init .
+One attribute object can be used in multiple calls to
+.Fn pthread_cond_init ,
+with or without modifications between calls.
+.Pp
+The
+.Fn pthread_condattr_init
+function initializes
+.Fa attr
+with all the default condition variable attributes.
+.Pp
+The
+.Fn pthread_condattr_destroy
+function destroys
+.Fa attr .
+.Pp
+The
+.Fn pthread_condattr_setclock
+function sets the clock attribute of
+.Fa attr
+to the value of the
+.Fa clock_id
+parameter.
+The
+.Fn pthread_condattr_getclock
+function copies the value of the clock attribute from
+.Fa attr
+to the location pointed to by the
+.Fa clock_id
+parameter.
+The clock attribute is the ID of the clock against which the timeout of
+.Fn pthread_cond_timedwait
+is compared;
+the default value of the clock attribute is
+.Dv CLOCK_REALTIME .
+.Sh RETURN VALUES
+If successful, these functions return 0.
+Otherwise, an error number is returned to indicate the error.
+.Sh ERRORS
+.Fn pthread_condattr_init
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOMEM
+Out of memory.
+.El
+.Pp
+.Fn pthread_condattr_setclock
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of
+.Fa clock_id
+is neither
+.Dv CLOCK_REALTIME
+nor
+.Dv CLOCK_MONOTONIC .
+.El
+.Sh SEE ALSO
+.Xr clock_gettime 2 ,
+.Xr pthread_cond_init 3
+.Sh STANDARDS
+.Fn pthread_condattr_init ,
+.Fn pthread_condattr_destroy ,
+.Fn pthread_condattr_setclock ,
+and
+.Fn pthread_condattr_getclock
+conform to
+.St -p1003.1-2008