minix/lib/libc/sys/_lwp_wakeup.2

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.\" $NetBSD: _lwp_wakeup.2,v 1.5 2008/04/30 13:10:51 martin 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.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 2. Redistributions in binary form must reproduce the above copyright
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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 January 13, 2003
.Dt _LWP_WAKEUP 2
.Os
.Sh NAME
.Nm _lwp_wakeup
.Nd make a blocked light-weight process runnable
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In lwp.h
.Ft int
.Fn _lwp_wakeup "lwpid_t lwp"
.Sh DESCRIPTION
.Fn _lwp_wakeup
makes a blocked LWP runnable. The blocked LWP must be in
.Dv LSSLEEP
state.
Unblocking the LWP does not guarantee that it will make progress; it
may block again as soon as it resumes execution in the kernel.
.Sh RETURN VALUES
Upon successful completion,
.Fn _lwp_wakeup
returns a value of 0.
Otherwise, an error code is returned to indicate the error.
.Sh ERRORS
.Fn _lwp_wakeup
will fail if:
.Bl -tag -width [ENODEV]
.It Bq Er ESRCH
No LWP can be found in the current process corresponding to that
specified by
.Fa lwp .
.It Bq Er ENODEV
The specified LWP is not in
.Dv LSSLEEP
state.
.It Bq Er EBUSY
The specified LWP is blocked in an uninterruptible sleep.
.El
.Sh HISTORY
The
.Fn _lwp_wakeup
system call first appeared in
.Nx 2.0 .