NetBSD-5.0.2/lib/libpthread/pthread_cancel.3

.\" $NetBSD: pthread_cancel.3,v 1.3 2008/04/30 13:10:52 martin 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:
.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: src/lib/libpthread/man/pthread_cancel.3,v 1.7 2002/09/16 19:29:28 mini Exp $
.Dd January 30, 2003
.Dt PTHREAD_CANCEL 3
.Os
.Sh NAME
.Nm pthread_cancel
.Nd cancel execution of a thread
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_cancel "pthread_t thread"
.Sh DESCRIPTION
The
.Fn pthread_cancel
function requests that
.Fa thread
be canceled.
The target thread's cancelability state and type determines
when the cancellation takes effect.
When the cancellation is acted on,
the cancellation cleanup handlers for
.Fa thread
are called.
When the last cancellation cleanup handler returns,
the thread-specific data destructor functions will be called for
.Fa thread .
When the last destructor function returns,
.Fa thread
will be terminated.
.Pp
The cancellation processing in the target thread runs asynchronously with
respect to the calling thread returning from
.Fn pthread_cancel .
.Pp
A status of
.Dv PTHREAD_CANCELED
is made available to any threads joining with the target.
The symbolic
constant
.Dv PTHREAD_CANCELED
expands to a constant expression of type
.Ft (void *) ,
whose value matches no pointer to an object in memory nor the value
.Dv NULL .
.Sh RETURN VALUES
If successful,  the
.Fn pthread_cancel
functions will return zero.
Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
.Fn pthread_cancel
may fail if:
.Bl -tag -width Er
.It Bq Er ESRCH
No thread could be found corresponding to that specified by the given
thread ID.
.El
.Sh SEE ALSO
.Xr pthread_cleanup_pop 3 ,
.Xr pthread_cleanup_push 3 ,
.Xr pthread_exit 3 ,
.Xr pthread_join 3 ,
.Xr pthread_setcancelstate 3 ,
.Xr pthread_setcanceltype 3 ,
.Xr pthread_testcancel 3
.Sh STANDARDS
.Fn pthread_cancel
conforms to
.St -p1003.1-96 .
.Sh AUTHORS
This man page was written by
.An David Leonard Aq d@openbsd.org
for the
.Ox
implementation of
.Fn pthread_cancel .