472351e13d
.In header.h instead of .Fd #include \*[Lt]header.h\*[Gt] Much easier to read and write, and supported by groff for ages. Okayed by ross.
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Groff
86 lines
3.1 KiB
Groff
.\" $NetBSD: SCHED_LOCK.9,v 1.4 2003/04/16 13:35:24 wiz Exp $
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.\"
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.\" Copyright (c) 2002 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 Gregory McGarry.
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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 September 21, 2002
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.Dt SCHED_LOCK 9
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.Os
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.Sh NAME
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.Nm SCHED_LOCK ,
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.Nm SCHED_UNLOCK ,
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.Nm sched_lock_idle ,
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.Nm sched_unlock_idle
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.Nd scheduler lock operations
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.Sh SYNOPSIS
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.In sys/sched.h
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.Ft void
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.Fn sched_lock_idle "void"
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.Ft void
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.Fn sched_unlock_idle "void"
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.Ft int
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.Fn SCHED_LOCK "void"
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.Ft void
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.Fn SCHED_UNLOCK "int s"
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.Sh DESCRIPTION
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Access to the system run queue within the scheduler is protected by the
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.Va sched_lock
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simplelock and the
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.Xr splsched 9
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interrupt priority level.
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The
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.Fn sched_lock_idle
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and
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.Fn sched_unlock_idle
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are simple functions without arguments which can be called easily from
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machine-dependent assembler routines
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.Pq such as from Xr cpu_idle 9
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to lock and unlock the scheduler.
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The macros
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.Fn SCHED_LOCK
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and
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.Fn SCHED_UNLOCK
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provide a simple interface for machine-independent routines to
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simultaneously acquire
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.Va sched_lock
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and raise the interrupt priority level to
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.Xr splsched 9 .
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.Fn SCHED_LOCK
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returns the current interrupt priority level which is later passed to
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.Fn SCHED_UNLOCK
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when the scheduler lock is released.
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.Sh SEE ALSO
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.Xr scheduler 9 ,
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.Xr splsched 9
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