NetBSD/lib/libpthread/pthread_cleanup_push.3

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.\" $NetBSD: pthread_cleanup_push.3,v 1.4 2003/07/04 08:42:20 wiz Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" contributors may be used to endorse or promote products derived
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.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
.\" 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 author nor the names of any co-contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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
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.\" 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
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.\" SUCH DAMAGE.
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.\" $FreeBSD: src/lib/libpthread/man/pthread_cleanup_push.3,v 1.11 2002/09/16 19:29:28 mini Exp $
.\"
.Dd January 30, 2003
.Dt PTHREAD_CLEANUP 3
.Os
.Sh NAME
.Nm pthread_cleanup_push ,
.Nm pthread_cleanup_pop
.Nd add and remove cleanup functions for thread exit
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft void
.Fn pthread_cleanup_push "void \*[lp]*cleanup_routine\*[rp]\*[lp]void *\*[rp]" "void *arg"
.Ft void
.Fn pthread_cleanup_pop "int execute"
.Sh DESCRIPTION
The
.Fn pthread_cleanup_push
function adds
.Fa cleanup_routine
to the top of the stack of cleanup handlers that
get called when the current thread exits.
.Pp
The
.Fn pthread_cleanup_pop
function pops the top cleanup routine off of the current threads cleanup
routine stack, and, if
.Fa execute
is non-zero, it will execute the function.
.Pp
When
.Fa cleanup_routine
is called, it is passed
.Fa arg
as its only argument.
.Pp
These functions may be implemented as macros which contain scope delimiters;
therefore, there must be a matching
.Fn pthread_cleanup_pop
for every
.Fn pthread_cleanup_push
at the same level of lexical scoping.
.Pp
The effect of calling
.Fn longjmp
or
.Fn siglongjmp
is undefined after a call to
.Fn pthread_cleanup_push
but before the matching call to
.Fn pthread_cleanup_pop
after the jump buffer was filled.
.Sh RETURN VALUES
Neither
.Fn pthread_cleanup_push
nor
.Fn pthread_cleanup_pop
returns a value.
.Sh ERRORS
None.
.Sh SEE ALSO
.Xr pthread_exit 3
.Sh STANDARDS
.Fn pthread_cleanup_push
and
.Fn pthread_cleanup_pop
conform to
.St -p1003.1-96 .