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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 <synch/waitq.h>

#include <synch/rwlock.h>

#define READERS     50

#define WRITERS     50

static rwlock_t rwlock;

static waitq_t can_start;

static atomic_t items_read;

static atomic_t items_written;

static void writer(void *arg)

{

    thread_detach(THREAD);

    waitq_sleep(&can_start);

    rwlock_write_lock(&rwlock);

    atomic_inc(&items_written);

    rwlock_write_unlock(&rwlock);

}

static void reader(void *arg)

{

    thread_detach(THREAD);

    waitq_sleep(&can_start);

    rwlock_read_lock(&rwlock);

    atomic_inc(&items_read);

    rwlock_read_unlock(&rwlock);

}

char * test_rwlock5(bool quiet)

{

    int i, j, k;

    long readers, writers;

    waitq_initialize(&can_start);

    rwlock_initialize(&rwlock);

    for (i = 1; i <= 3; i++) {

        thread_t *thrd;

        atomic_set(&items_read, 0);

        atomic_set(&items_written, 0);

        readers = i * READERS;

        writers = (4 - i) * WRITERS;

        printf("Creating %ld readers and %ld writers...", readers, writers);

        for (j = 0; j < (READERS + WRITERS) / 2; j++) {

            for (k = 0; k < i; k++) {

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

                if (thrd)

                    thread_ready(thrd);

                else

                    printf("Could not create reader %d\n", k);

            }

            for (k = 0; k < (4 - i); k++) {

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

                if (thrd)

                    thread_ready(thrd);

                else

                    printf("Could not create writer %d\n", k);

            }

        }

        printf("ok\n");

        thread_sleep(1);

        waitq_wakeup(&can_start, WAKEUP_ALL);

        while ((items_read.count != readers) || (items_written.count != writers)) {

            printf("%zd readers remaining, %zd writers remaining, readers_in=%zd\n", readers - items_read.count, writers - items_written.count, rwlock.readers_in);

            thread_usleep(100000);

        }

    }

    return NULL;

}