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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/rwlock.h>

#define THREADS 4

static atomic_t thread_count;

static rwlock_t rwlock;

static bool sh_quiet;

static void reader(void *arg)

{

    thread_detach(THREAD);

    if (!sh_quiet)

        printf("cpu%u, tid %" PRIu64 ": trying to lock rwlock for reading....\n", CPU->id, THREAD->tid);

    rwlock_read_lock(&rwlock);

    rwlock_read_unlock(&rwlock);

    if (!sh_quiet) {

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

        printf("cpu%u, tid %" PRIu64 ": trying to lock rwlock for writing....\n", CPU->id, THREAD->tid);       

    }

    rwlock_write_lock(&rwlock);

    rwlock_write_unlock(&rwlock);

    if (!sh_quiet)

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

    atomic_dec(&thread_count);

}

char * test_rwlock3(bool quiet)

{

    int i;

    thread_t *thrd;

    sh_quiet = quiet;

    atomic_set(&thread_count, THREADS);

    rwlock_initialize(&rwlock);

    rwlock_write_lock(&rwlock);

    for (i = 0; i < THREADS; i++) {

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

        if (thrd)

            thread_ready(thrd);

        else if (!quiet)

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

    }

    thread_sleep(1);

    rwlock_write_unlock(&rwlock);

    while (atomic_get(&thread_count) > 0) {

        if (!quiet)

            printf("Threads left: %ld\n", atomic_get(&thread_count));

        thread_sleep(1);

    }

    return NULL;

}