102 lines
3.2 KiB
Groff
102 lines
3.2 KiB
Groff
.\" $NetBSD: _lwp_suspend.2,v 1.3 2003/04/16 13:34:50 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Jason R. Thorpe of Wasabi Systems, Inc.
|
|
.\"
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.Dd January 13, 2003
|
|
.Dt _LWP_SUSPEND 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm _lwp_suspend ,
|
|
.Nm _lwp_continue
|
|
.Nd suspend or continue a light-weight process
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In lwp.h
|
|
.Ft int
|
|
.Fn _lwp_suspend "lwpid_t lwp"
|
|
.Ft int
|
|
.Fn _lwp_continue "lwpid_t lwp"
|
|
.Sh DESCRIPTION
|
|
.Fn _lwp_suspend
|
|
suspends execution of the LWP specified by
|
|
.Fa lwp .
|
|
Once an LWP is suspended, subsequent calls to
|
|
.Fn _lwp_suspend
|
|
have no effect.
|
|
The only way to resume execution of a suspended LWP is via
|
|
.Fn _lwp_continue .
|
|
.Pp
|
|
.Fn _lwp_continue
|
|
resumes execution of the LWP specified by
|
|
.Fa lwp .
|
|
Once an LWP is resumed, subsequent calls to
|
|
.Fn _lwp_continue
|
|
have no effect.
|
|
.Sh RETURN VALUES
|
|
Upon successful completion,
|
|
.Fn _lwp_suspend
|
|
and
|
|
.Fn _lwp_continue
|
|
return a value of 0.
|
|
Otherwise, an error code is returned to indicate the error.
|
|
.Sh ERRORS
|
|
.Fn _lwp_suspend
|
|
and
|
|
.Fn _lwp_continue
|
|
will fail if:
|
|
.Bl -tag -width [EDEADLK]
|
|
.It Bq Er ESRCH
|
|
No LWP can be found in the current process corresponding to that
|
|
specified by
|
|
.Fa lwp .
|
|
.El
|
|
.Pp
|
|
.Fn _lwp_suspend
|
|
will fail if:
|
|
.Bl -tag -width [EDEADLK]
|
|
.It Bq Er EDEADLK
|
|
The LWP specified by
|
|
.Fa lwp
|
|
is the only LWP in the process.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr _lwp_create 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn _lwp_create
|
|
system call first appeared in
|
|
.Nx 2.0 .
|