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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <test.h>
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#include <arch.h>
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#include <atomic.h>
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#include <print.h>
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#include <proc/thread.h>
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#include <synch/waitq.h>
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#include <synch/rwlock.h>
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#define READERS     50
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#define WRITERS     50
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static rwlock_t rwlock;
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static waitq_t can_start;
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static atomic_t items_read;
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static atomic_t items_written;
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static void writer(void *arg);
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static void reader(void *arg);
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static void failed(void);
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void writer(void *arg)
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{
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    waitq_sleep(&can_start);
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    rwlock_write_lock(&rwlock);
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    atomic_inc(&items_written);
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    rwlock_write_unlock(&rwlock);
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}
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void reader(void *arg)
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{
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    waitq_sleep(&can_start);
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    rwlock_read_lock(&rwlock);
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    atomic_inc(&items_read);
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    rwlock_read_unlock(&rwlock);
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}
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void failed(void)
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{
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    printf("Test failed prematurely.\n");
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    thread_exit();
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}
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void test(void)
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{
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    int i, j, k;
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    count_t readers, writers;
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    printf("Read/write locks test #5\n");
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    waitq_initialize(&can_start);
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    rwlock_initialize(&rwlock);
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    for (i=1; i<=3; i++) {
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        thread_t *thrd;
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        atomic_set(&items_read, 0);
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        atomic_set(&items_written, 0);
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        readers = i*READERS;
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        writers = (4-i)*WRITERS;
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        printf("Creating %d readers and %d writers...", readers, writers);
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        for (j=0; j<(READERS+WRITERS)/2; j++) {
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            for (k=0; k<i; k++) {
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                thrd = thread_create(reader, NULL, TASK, 0, "reader");
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                if (thrd)
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                    thread_ready(thrd);
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                else
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                    failed();
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            }
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            for (k=0; k<(4-i); k++) {
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                thrd = thread_create(writer, NULL, TASK, 0, "writer");
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                if (thrd)
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                    thread_ready(thrd);
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                else
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                    failed();
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            }
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        }
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        printf("ok\n");
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        thread_sleep(1);
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        waitq_wakeup(&can_start, WAKEUP_ALL);
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        while (items_read.count != readers || items_written.count != writers) {
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            printf("%d readers remaining, %d writers remaining, readers_in=%d\n", readers - items_read.count, writers - items_written.count, rwlock.readers_in);
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            thread_usleep(100000);
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        }
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    }
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    printf("Test passed.\n");
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}