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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);
static void reader(void *arg);
static void failed(void);

void writer(void *arg)
{
    thread_detach(THREAD);

    waitq_sleep(&can_start);

    rwlock_write_lock(&rwlock);
    atomic_inc(&items_written);
    rwlock_write_unlock(&rwlock);
}

void reader(void *arg)
{
    thread_detach(THREAD);

    waitq_sleep(&can_start);
    
    rwlock_read_lock(&rwlock);
    atomic_inc(&items_read);
    rwlock_read_unlock(&rwlock);
}

void failed(void)
{
    printf("Test failed prematurely.\n");
    thread_exit();
}

void test(void)
{
    int i, j, k;
    count_t readers, writers;
    
    printf("Read/write locks test #5\n");
    
    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");
                if (thrd)
                    thread_ready(thrd);
                else
                    failed();
            }
            for (k=0; k<(4-i); k++) {
                thrd = thread_create(writer, NULL, TASK, 0, "writer");
                if (thrd)
                    thread_ready(thrd);
                else
                    failed();
            }
        }

        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);
        }
    }
    printf("Test passed.\n");
}