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/* $NetBSD: tsleep.c,v 1.4 2014/03/21 22:18:57 dholland Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* 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. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
* CONTRIBUTORS ``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 FOUNDATION OR CONTRIBUTORS 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/cdefs.h>
#if !defined(lint)
__RCSID("$NetBSD: tsleep.c,v 1.4 2014/03/21 22:18:57 dholland Exp $");
#endif /* !lint */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/proc.h>
#include "kernspace.h"
#define NTHREADS 10
/*
* mpsafe thread. need dedicated interlock
*/
static kmutex_t mymtx;
static void
tinythread(void *arg)
{
static int wakeups;
int i, rv;
bool relock = ((uintptr_t)arg % 2) == 0;
for (i = 0; i < 1000; i++) {
mutex_enter(&mymtx);
wakeup(tinythread);
if (wakeups >= NTHREADS-1) {
mutex_exit(&mymtx);
break;
}
rv = mtsleep(tinythread, relock ? 0 : PNORELOCK,
"haa", 0, &mymtx);
if (relock)
mutex_exit(&mymtx);
if (rv != 0)
panic("mtsleep failed");
}
mutex_enter(&mymtx);
wakeups++;
wakeup(tinythread);
rv = mtsleep(rumptest_tsleep, PNORELOCK, "kepuli", 1, &mymtx);
if (rv != EWOULDBLOCK)
panic("mtsleep unexpected return value %d", rv);
kthread_exit(0);
}
void
rumptest_tsleep()
{
struct lwp *notbigl[NTHREADS];
int rv, i;
mutex_init(&mymtx, MUTEX_DEFAULT, IPL_NONE);
for (i = 0; i < NTHREADS; i++) {
rv = kthread_create(PRI_NONE, KTHREAD_MUSTJOIN| KTHREAD_MPSAFE,
NULL, tinythread, (void *)(uintptr_t)i, ¬bigl[i], "nb");
if (rv)
panic("thread create failed: %d", rv);
}
for (i = 0; i < NTHREADS; i++) {
kthread_join(notbigl[i]);
}
}
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