2016-05-14 08:36:37 +00:00
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.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
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.\"
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.\" This documentation was written by
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.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
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.\" from the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $FreeBSD$
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.\"
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2020-05-05 19:31:47 +00:00
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.Dd May 5, 2020
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2016-05-14 08:36:37 +00:00
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.Dt THR_SELF 2
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.Os
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.Sh NAME
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.Nm thr_self
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.Nd return thread identifier for the calling thread
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/thr.h
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.Ft int
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.Fn thr_self "long *id"
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.Sh DESCRIPTION
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The
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.Fn thr_self
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system call stores the system-wide thread identifier for the current
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kernel-scheduled thread in the variable pointed by the argument
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.Va id .
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.Pp
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The thread identifier is an integer in the range from
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.Dv PID_MAX + 2
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2020-03-03 09:51:53 +00:00
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(100001) to
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2016-05-14 08:36:37 +00:00
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.Dv INT_MAX .
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The thread identifier is guaranteed to be unique at any given time,
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for each running thread in the system.
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After the thread exits, the identifier may be reused.
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.Sh RETURN VALUES
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If successful,
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.Fn thr_self
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will return zero, otherwise \-1 is returned, and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn thr_self
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operation may return the following errors:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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The memory pointed to by the
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.Fa id
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argument is not valid.
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.El
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.Sh SEE ALSO
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2020-12-19 14:54:28 +00:00
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.Xr _umtx_op 2 ,
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2016-05-14 08:36:37 +00:00
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.Xr thr_exit 2 ,
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.Xr thr_kill 2 ,
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.Xr thr_kill2 2 ,
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.Xr thr_new 2 ,
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.Xr thr_set_name 2 ,
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2016-06-01 21:58:13 +00:00
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.Xr pthread_getthreadid_np 3 ,
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.Xr pthread_self 3
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2016-05-14 08:36:37 +00:00
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.Sh STANDARDS
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The
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.Fn thr_self
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2016-05-29 14:16:23 +00:00
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system call is non-standard and is used by
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2016-05-14 08:36:37 +00:00
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.Lb libthr
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to implement
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.St -p1003.1-2001
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2016-05-29 14:16:23 +00:00
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.Xr pthread 3
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2016-05-14 08:36:37 +00:00
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functionality.
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2020-05-05 19:31:47 +00:00
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.Sh HISTORY
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The
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.Fn thr_self
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system call first appeared in
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.Fx 5.2 .
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