minix/lib/nbsd_libc/sys/_lwp_unpark_all.2
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

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.\" $NetBSD: _lwp_unpark_all.2,v 1.6 2010/11/02 20:49:47 skrll Exp $
.\"
.\" Copyright (c) 2003, 2007 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, and by Andrew Doran.
.\"
.\" 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.
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.Dd February 10, 2007
.Dt _LWP_UNPARK_ALL 2
.Os
.Sh NAME
.Nm _lwp_unpark_all
.Nd resume execution of a waiting LWP
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In lwp.h
.Ft ssize_t
.Fn _lwp_unpark_all "lwpid_t *targets" "size_t ntargets" "const void *hint"
.Sh DESCRIPTION
.Fn _lwp_unpark_all
resumes execution of one or more light-weight processes listed in
the array pointed to by
.Fa targets .
.Pp
The target LWPs are assumed to be waiting in the kernel as a result of
calls to
.Fn _lwp_park .
If any of the target LWPs are not currently waiting, those LWPs will return
immediately upon the next call to
.Fn _lwp_park .
.Pp
The value pointed to by
.Fa ntargets
specifies the size of the array pointed to by
.Fa targets .
If the
.Fa targets
argument is given as
.Dv NULL ,
the maximum size of the array (expressed
as the number of entries) is returned.
.Pp
See
.Xr _lwp_park 2
for a description of the
.Fa hint
argument.
.Sh RETURN VALUES
If the maximum size of the
.Fa targets
array is not being queried, a return of 0 indicates that the call succeeded.
A \-1 return value indicates an error occurred and
.Va errno
is set to indicate the reason.
.Sh ERRORS
.Bl -tag -width [EINVAL]
.It Bq Er EFAULT
The value specified for
.Fa targets
is invalid.
.It Bq Er EINVAL
The value specified for
.Fa ntargets
is out of range.
.It Bq Er ENOMEM
Insufficient resources are available to complete the operation.
.El
.Sh SEE ALSO
.Xr _lwp_park 2 ,
.Xr _lwp_unpark 2 ,
.Xr _lwp_wakeup 2
.Sh HISTORY
The
.Fn _lwp_unpark_all
system call first appeared in
.Nx 5.0 .