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/*

 * Copyright (c) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - 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 BY THE AUTHOR ``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 <test.h>

#include <arch.h>

#include <atomic.h>

#include <print.h>

#include <proc/thread.h>

#include <arch/types.h>

#include <arch/context.h>

#include <synch/waitq.h>

#include <synch/semaphore.h>

#include <synch/synch.h>

#include <synch/spinlock.h>

static semaphore_t sem;

SPINLOCK_INITIALIZE(sem_lock);

static waitq_t can_start;

static uint32_t seed = 0xdeadbeef;

static uint32_t random(uint32_t max)

{

    uint32_t rc;

    spinlock_lock(&sem_lock);  

    rc = seed % max;

    seed = (((seed << 2) ^ (seed >> 2)) * 487) + rc;

    spinlock_unlock(&sem_lock);

    return rc;

}

static void consumer(void *arg)

{

    int rc, to;

    thread_detach(THREAD);

    waitq_sleep(&can_start);

    to = random(20000);

    printf("cpu%u, tid %" PRIu64 " down+ (%d)\n", CPU->id, THREAD->tid, to);

    rc = semaphore_down_timeout(&sem, to);

    if (SYNCH_FAILED(rc)) {

        printf("cpu%u, tid %" PRIu64 " down!\n", CPU->id, THREAD->tid);

        return;

    }

    printf("cpu%u, tid %" PRIu64 " down=\n", CPU->id, THREAD->tid);

    thread_usleep(random(30000));

    semaphore_up(&sem);

    printf("cpu%u, tid %" PRIu64 " up\n", CPU->id, THREAD->tid);

}

char * test_semaphore2(bool quiet)

{

    uint32_t i, k;

    waitq_initialize(&can_start);

    semaphore_initialize(&sem, 5);

    thread_t *thrd;

    k = random(7) + 1;

    printf("Creating %" PRIu32 " consumers\n", k);

    for (i = 0; i < k; i++) {

        thrd = thread_create(consumer, NULL, TASK, 0, "consumer", false);

        if (thrd)

            thread_ready(thrd);

        else

            printf("Error creating thread\n");

    }

    thread_usleep(20000);

    waitq_wakeup(&can_start, WAKEUP_ALL);

    return NULL;

}