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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 <context.h>

#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <synch/synch.h>
#include <synch/spinlock.h>

#define READERS     50
#define WRITERS     50

static atomic_t thread_count;
static rwlock_t rwlock;
static atomic_t threads_fault;
static bool sh_quiet;

SPINLOCK_INITIALIZE(rw_lock);

static waitq_t can_start;

static uint32_t seed = 0xdeadbeef;

static uint32_t random(uint32_t max)
{
    uint32_t rc;

    spinlock_lock(&rw_lock);    
    rc = seed % max;
    seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
    spinlock_unlock(&rw_lock);
    return rc;
}

static void writer(void *arg)
{
    int rc, to;
    thread_detach(THREAD);
    waitq_sleep(&can_start);

    to = random(40000);
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu w+ (%d)\n", CPU->id, THREAD->tid, to);
    
    rc = rwlock_write_lock_timeout(&rwlock, to);
    if (SYNCH_FAILED(rc)) {
        if (!sh_quiet)
            printf("cpu%d, tid %llu w!\n", CPU->id, THREAD->tid);
        atomic_dec(&thread_count);
        return;
    }
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu w=\n", CPU->id, THREAD->tid);

    if (rwlock.readers_in) {
        if (!sh_quiet)
            printf("Oops.");
        atomic_inc(&threads_fault);
        atomic_dec(&thread_count);
        return;
    }
    thread_usleep(random(1000000));
    if (rwlock.readers_in) {
        if (!sh_quiet)
            printf("Oops.");    
        atomic_inc(&threads_fault);
        atomic_dec(&thread_count);
        return;
    }

    rwlock_write_unlock(&rwlock);
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu w-\n", CPU->id, THREAD->tid);
    atomic_dec(&thread_count);
}

static void reader(void *arg)
{
    int rc, to;
    thread_detach(THREAD);
    waitq_sleep(&can_start);
    
    to = random(2000);
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu r+ (%d)\n", CPU->id, THREAD->tid, to);
    
    rc = rwlock_read_lock_timeout(&rwlock, to);
    if (SYNCH_FAILED(rc)) {
        if (!sh_quiet)
            printf("cpu%d, tid %llu r!\n", CPU->id, THREAD->tid);
        atomic_dec(&thread_count);
        return;
    }
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu r=\n", CPU->id, THREAD->tid);
    
    thread_usleep(30000);
    rwlock_read_unlock(&rwlock);
    
    if (!sh_quiet)
        printf("cpu%d, tid %llu r-\n", CPU->id, THREAD->tid);
    atomic_dec(&thread_count);
}

char * test_rwlock4(bool quiet)
{
    context_t ctx;
    uint32_t i;
    sh_quiet = quiet;
    
    waitq_initialize(&can_start);
    rwlock_initialize(&rwlock);
    atomic_set(&threads_fault, 0);
    
    uint32_t rd = random(7) + 1;
    uint32_t wr = random(5) + 1;
    
    atomic_set(&thread_count, rd + wr);
    
    thread_t *thrd;
    
    context_save(&ctx);
    if (!quiet) {
        printf("sp=%#x, readers_in=%d\n", ctx.sp, rwlock.readers_in);
        printf("Creating %d readers\n", rd);
    }
    
    for (i = 0; i < rd; 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);
    }

    if (!quiet)
        printf("Creating %d writers\n", wr);
    
    for (i = 0; i < wr; i++) {
        thrd = thread_create(writer, NULL, TASK, 0, "writer", false);
        if (thrd)
            thread_ready(thrd);
        else if (!quiet)
            printf("Could not create writer %d\n", i);
    }
    
    thread_usleep(20000);
    waitq_wakeup(&can_start, WAKEUP_ALL);
    
    while (atomic_get(&thread_count) > 0) {
        if (!quiet)
            printf("Threads left: %d\n", atomic_get(&thread_count));
        thread_sleep(1);
    }
    
    if (atomic_get(&threads_fault) == 0)
        return NULL;
    
    return "Test failed";
}