80 lines
2.6 KiB
Groff
80 lines
2.6 KiB
Groff
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.\" $NetBSD: _lwp_unpark.2,v 1.4 2010/11/02 20:49:47 skrll Exp $
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.\"
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.\" Copyright (c) 2003, 2007 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, and by Andrew Doran.
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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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.\"
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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 20, 2007
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.Dt _LWP_UNPARK 2
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.Os
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.Sh NAME
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.Nm _lwp_unpark
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.Nd resume execution of a waiting LWP
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In lwp.h
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.Ft int
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.Fn _lwp_unpark "lwpid_t lwp" "const void *hint"
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.Sh DESCRIPTION
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.Fn _lwp_unpark
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resumes execution of the light-weight process
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.Fa lwp .
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.Pp
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The target LWP is assumed to be waiting in the kernel as a result of a
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call to
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.Fn _lwp_park .
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If the target LWP is not currently waiting, it will return immediately
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upon the next call to
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.Fn _lwp_park .
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.Pp
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See
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.Xr _lwp_park 2
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for a description of the
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.Fa hint
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argument.
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.Sh RETURN VALUES
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A 0 value indicates that the call succeeded.
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A \-1 return value indicates an error occurred and
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.Va errno
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is set to indicate the reason.
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.Sh ERRORS
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.Bl -tag -width [EINVAL]
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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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.Sh SEE ALSO
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.Xr _lwp_park 2 ,
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.Xr _lwp_unpark_all 2 ,
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.Xr _lwp_wakeup 2
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.Sh HISTORY
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The
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.Fn _lwp_unpark
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system call first appeared in
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.Nx 5.0 .
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