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+.\"	$OpenBSD: getthrid.2,v 1.4 2016/03/30 06:58:06 jmc Exp $
+.\"	$NetBSD: getpid.2,v 1.5 1995/02/27 12:33:12 cgd Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     @(#)getpid.2	8.1 (Berkeley) 6/4/93
+.\"
+.Dd $Mdocdate: March 30 2016 $
+.Dt GETTHRID 2
+.Os
+.Sh NAME
+.Nm getthrid
+.Nd get thread identifier
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn getthrid void
+.Sh DESCRIPTION
+.Fn getthrid
+returns the thread ID of the calling thread.
+This is used in the implementation of the thread library
+.Pq Fl lpthread
+and can appear in the output of system utilities such as
+.Xr ps 1
+and
+.Xr kdump 1 .
+.Pp
+Thread IDs are not a stable interface and should not be used directly
+by applications except for correlation with system utility output.
+Applications should use the
+.Vt pthread_t
+values from
+.Xr pthread_self 3
+and
+.Xr pthread_create 3
+to identify threads within the process itself.
+.Sh RETURN VALUES
+This function is always successful, and no return value is
+reserved to indicate an error.
+.Sh SEE ALSO
+.Xr getpid 2 ,
+.Xr __tfork 3 ,
+.Xr pthread_create 3 ,
+.Xr pthread_self 3
+.Sh STANDARDS
+The
+.Fn getthrid
+syscall is specific to
+.Ox
+and should not be used in portable applications.
+.Sh HISTORY
+The
+.Fn getthrid
+syscall appeared in
+.Ox 3.9 .