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/*
* Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#ifndef __HAVE_MUTEX
/*
* Single processor systems don't need any mutexes, but they need the spl
* raising semantics of the mutexes.
*/
void
mtx_init1(struct mutex *mtx, int wantipl)
{
mtx->mtx_oldipl = 0;
mtx->mtx_wantipl = wantipl;
mtx->mtx_lock = 0;
}
void
mtx_enter(struct mutex *mtx)
{
#define UGLY(lc, uc) case MUTEX_IPL_##uc: mtx->mtx_oldipl = spl##lc(); break
switch (mtx->mtx_wantipl) {
UGLY(high, HIGH);
UGLY(statclock, STATCLOCK);
#ifdef IPL_SCHED
UGLY(sched, SCHED);
#endif
UGLY(clock, CLOCK);
UGLY(vm, VM);
UGLY(tty, TTY);
UGLY(net, NET);
UGLY(bio, BIO);
UGLY(softnet, SOFTNET);
UGLY(softclock, SOFTCLOCK);
case MUTEX_IPL_NONE:
break;
default:
panic("mtx_enter: ipl not implemented");
}
#undef UGLY
MUTEX_ASSERT_UNLOCKED(mtx);
mtx->mtx_lock = 1;
}
void
mtx_leave(struct mutex *mtx)
{
MUTEX_ASSERT_LOCKED(mtx);
mtx->mtx_lock = 0;
if (mtx->mtx_wantipl != MUTEX_IPL_NONE)
splx(mtx->mtx_oldipl);
}
#endif
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