534c9c78f3
Add text to thr_exit(2) and thr_new(2) discouraging their use in applications since calling these in a process with libthr loaded will confuse libthr and is likely to cause hangs or crashes. The thr_kill2(2) call is not used by libthr and may be useful in special applications. The other calls can be used in applications but it should not be necessary.
91 lines
2.7 KiB
Groff
91 lines
2.7 KiB
Groff
.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
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.\" All rights reserved.
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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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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 1, 2016
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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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(10002) to
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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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.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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.Xr _umtx_op 2 ,
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.Xr pthread_getthreadid_np 3 ,
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.Xr pthread_self 3
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.Sh STANDARDS
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The
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.Fn thr_self
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system call is non-standard and is used by
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.Lb libthr
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to implement
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.St -p1003.1-2001
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.Xr pthread 3
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functionality.
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