source: mainline/kernel/test/synch/semaphore1.c@ 70b6de1

/*
 * 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/semaphore.h>

#define AT_ONCE                 3
#define PRODUCERS               50
#define CONSUMERS               50

static semaphore_t sem;

static waitq_t can_start;
static atomic_t items_produced;
static atomic_t items_consumed;

static void consumer(void *arg);
static void producer(void *arg);
static void failed(void);

static void producer(void *arg)
{
        thread_detach(THREAD);  

        waitq_sleep(&can_start);
            
        semaphore_down(&sem);
        atomic_inc(&items_produced);
        thread_usleep(250);
        semaphore_up(&sem);
}

static void consumer(void *arg)
{
        thread_detach(THREAD);  
        
        waitq_sleep(&can_start);
        
        semaphore_down(&sem);
        atomic_inc(&items_consumed);
        thread_usleep(500);
        semaphore_up(&sem);
}

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

void test_semaphore1(void)
{
        int i, j, k;
        int consumers, producers;
        
        printf("Semaphore test #1\n");
    
        waitq_initialize(&can_start);
        semaphore_initialize(&sem, AT_ONCE);


        for (i=1; i<=3; i++) {
                thread_t *thrd;

                atomic_set(&items_produced, 0);
                atomic_set(&items_consumed, 0);
                
                consumers = i * CONSUMERS;
                producers = (4-i) * PRODUCERS;
                
                printf("Creating %d consumers and %d producers...", consumers, producers);
        
                for (j=0; j<(CONSUMERS+PRODUCERS)/2; j++) {
                        for (k=0; k<i; k++) {
                                thrd = thread_create(consumer, NULL, TASK, 0, "consumer");
                                if (thrd)
                                        thread_ready(thrd);
                                else
                                        failed();
                        }
                        for (k=0; k<(4-i); k++) {
                                thrd = thread_create(producer, NULL, TASK, 0, "producer");
                                if (thrd)
                                        thread_ready(thrd);
                                else
                                        failed();
                        }
                }

                printf("ok\n");

                thread_sleep(1);
                waitq_wakeup(&can_start, WAKEUP_ALL);
        
                while (items_consumed.count != consumers || items_produced.count != producers) {
                        printf("%d consumers remaining, %d producers remaining\n", consumers - items_consumed.count, producers - items_produced.count);
                        thread_sleep(1);
                }
        }
        printf("Test passed.\n");
}