[BACK]Return to pthread_cancel.3 CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / lib / libpthread

File: [cvs.NetBSD.org] / src / lib / libpthread / pthread_cancel.3 (download)

Revision 1.6, Wed Mar 12 07:32:46 2014 UTC (6 years ago) by dholland
Branch: MAIN
CVS Tags: yamt-pagecache-base9, tls-maxphys-base, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, HEAD
Changes since 1.5: +2 -2 lines

typo

.\" $NetBSD: pthread_cancel.3,v 1.6 2014/03/12 07:32:46 dholland Exp $
.\"
.\" Copyright (c) 2002, 2010 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 July 9, 2010
.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
whether and when the target thread reacts to the cancellation request.
.Bl -enum -offset 2n
.It
The cancelability
.Em state
of a thread is determined by the
.Xr pthread_setcancelstate 3
function.
The state can be either:
.Bl -bullet -offset 2n
.It
.Dv PTHREAD_CANCEL_ENABLE :
the cancelability type determines when the actual cancellation occurs.
This is the default.
.It
.Dv PTHREAD_CANCEL_DISABLE :
the request from
.Fn pthread_cancel
remains queued until the cancellation is enabled by the thread.
.El
.It
The cancellation
.Em type
of a thread is determined by the
.Xr pthread_setcanceltype 3
function.
The type can be either:
.Bl -bullet -offset 2n
.It
.Dv PTHREAD_CANCEL_DEFERRED :
the cancellation will be delayed until the thread calls
a function that is a cancellation point.
This is the default.
The available cancellation points are listed in
.Xr pthread_setcanceltype 3 .
.It
.Dv PTHREAD_CANCEL_ASYNCHRONOUS :
the thread can be canceled at any time.
.El
.El
.Pp
When the thread reacts to the cancellation request, the following occur:
.Bl -enum -offset 2n
.It
The cancellation cleanup handlers for the thread are called; see
.Xr pthread_cleanup_push 3 .
.It
When the last cancellation cleanup handler returns,
the thread-specific data destructor functions will be called for the thread.
.It
When the last destructor function returns, the thread will be terminated; see
.Xr pthread_exit 3 .
.El
.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
The
.Fn pthread_cancel
function 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_join 3 ,
.Xr pthread_testcancel 3
.Sh STANDARDS
The function conforms to
.St -p1003.1-2001 .