2003-04-16 17:34:34 +04:00
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.\" $NetBSD: _lwp_suspend.2,v 1.3 2003/04/16 13:34:50 wiz Exp $
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2003-01-18 13:52:16 +03:00
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of Wasabi Systems, Inc.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 13, 2003
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.Dt _LWP_SUSPEND 2
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.Os
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.Sh NAME
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.Nm _lwp_suspend ,
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.Nm _lwp_continue
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.Nd suspend or continue a light-weight process
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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2003-04-16 17:34:34 +04:00
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.In lwp.h
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2003-01-18 13:52:16 +03:00
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.Ft int
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.Fn _lwp_suspend "lwpid_t lwp"
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.Ft int
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.Fn _lwp_continue "lwpid_t lwp"
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.Sh DESCRIPTION
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.Fn _lwp_suspend
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suspends execution of the LWP specified by
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.Fa lwp .
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Once an LWP is suspended, subsequent calls to
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.Fn _lwp_suspend
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have no effect.
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The only way to resume execution of a suspended LWP is via
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.Fn _lwp_continue .
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.Pp
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.Fn _lwp_continue
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resumes execution of the LWP specified by
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.Fa lwp .
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Once an LWP is resumed, subsequent calls to
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.Fn _lwp_continue
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have no effect.
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn _lwp_suspend
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and
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.Fn _lwp_continue
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return a value of 0.
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Otherwise, an error code is returned to indicate the error.
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.Sh ERRORS
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.Fn _lwp_suspend
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and
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.Fn _lwp_continue
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will fail if:
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.Bl -tag -width [EDEADLK]
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.It Bq Er ESRCH
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No LWP can be found in the current process corresponding to that
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specified by
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.Fa lwp .
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.El
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.Pp
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.Fn _lwp_suspend
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will fail if:
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.Bl -tag -width [EDEADLK]
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.It Bq Er EDEADLK
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The LWP specified by
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.Fa lwp
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is the only LWP in the process.
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.El
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.Sh SEE ALSO
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.Xr _lwp_create 2
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.Sh HISTORY
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The
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.Fn _lwp_create
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system call first appeared in
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.Nx 2.0 .
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