/*      $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, &notbigl[i], "nb");
                if (rv)
                        panic("thread create failed: %d", rv);
        }

        for (i = 0; i < NTHREADS; i++) {
                kthread_join(notbigl[i]);
        }
}