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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 <arch/types.h>
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#include <arch/context.h>
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#include <context.h>
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#include <panic.h>
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#include <synch/waitq.h>
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#include <synch/rwlock.h>
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#include <synch/synch.h>
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#include <synch/spinlock.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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SPINLOCK_INITIALIZE(lock);
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static waitq_t can_start;
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__u32 seed = 0xdeadbeef;
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static __u32 random(__u32 max);
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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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__u32 random(__u32 max)
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{
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    __u32 rc;
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    spinlock_lock(&lock);  
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    rc = seed % max;
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    seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
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    spinlock_unlock(&lock);
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    return rc;
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}
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void writer(void *arg)
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{
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    int rc, to;
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    waitq_sleep(&can_start);
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    to = random(40000);
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    printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to);
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    rc = rwlock_write_lock_timeout(&rwlock, to);
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    if (SYNCH_FAILED(rc)) {
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        printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid);
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        return;
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    };
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    printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid);
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    if (rwlock.readers_in) panic("Oops.");
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    thread_usleep(random(1000000));
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    if (rwlock.readers_in) panic("Oops."); 
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    rwlock_write_unlock(&rwlock);
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    printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid);
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}
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void reader(void *arg)
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{
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    int rc, to;
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    waitq_sleep(&can_start);
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    to = random(2000);
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    printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to);
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    rc = rwlock_read_lock_timeout(&rwlock, to);
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    if (SYNCH_FAILED(rc)) {
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        printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid);
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        return;
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    }
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    printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid);
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    thread_usleep(30000);
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    rwlock_read_unlock(&rwlock);
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    printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid);    
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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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    context_t ctx;
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    __u32 i, k;
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    printf("Read/write locks test #4\n");
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    waitq_initialize(&can_start);
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    rwlock_initialize(&rwlock);
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    for (; ;) {
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        thread_t *thrd;
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        context_save(&ctx);
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        printf("sp=%#X, readers_in=%d\n", ctx.sp, rwlock.readers_in);
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        k = random(7) + 1;
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        printf("Creating %d readers\n", k);
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        for (i=0; i<k; i++) {
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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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        k = random(5) + 1;
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        printf("Creating %d writers\n", k);
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        for (i=0; i<k; i++) {
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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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        thread_usleep(20000);
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        waitq_wakeup(&can_start, WAKEUP_ALL);
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    }      
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}