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-.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
-.\" All rights reserved.
-.\"
-.\" This documentation was written by
-.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
-.\" from the FreeBSD Foundation.
-.\"
-.\" 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 AUTHORS 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 AUTHORS 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd May 5, 2020
-.Dt THR_SELF 2
-.Os
-.Sh NAME
-.Nm thr_self
-.Nd return thread identifier for the calling thread
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/thr.h
-.Ft int
-.Fn thr_self "long *id"
-.Sh DESCRIPTION
-The
-.Fn thr_self
-system call stores the system-wide thread identifier for the current
-kernel-scheduled thread in the variable pointed by the argument
-.Va id .
-.Pp
-The thread identifier is an integer in the range from
-.Dv PID_MAX + 2
-(100001) to
-.Dv INT_MAX .
-The thread identifier is guaranteed to be unique at any given time,
-for each running thread in the system.
-After the thread exits, the identifier may be reused.
-.Sh RETURN VALUES
-If successful,
-.Fn thr_self
-will return zero, otherwise \-1 is returned, and
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn thr_self
-operation may return the following errors:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-The memory pointed to by the
-.Fa id
-argument is not valid.
-.El
-.Sh SEE ALSO
-.Xr _umtx_op 2 ,
-.Xr thr_exit 2 ,
-.Xr thr_kill 2 ,
-.Xr thr_kill2 2 ,
-.Xr thr_new 2 ,
-.Xr thr_set_name 2 ,
-.Xr pthread_getthreadid_np 3 ,
-.Xr pthread_self 3
-.Sh STANDARDS
-The
-.Fn thr_self
-system call is non-standard and is used by
-.Lb libthr
-to implement
-.St -p1003.1-2001
-.Xr pthread 3
-functionality.
-.Sh HISTORY
-The
-.Fn thr_self
-system call first appeared in
-.Fx 5.2 .