/*
* 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 <panic.h>
#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
#define READERS 50
#define WRITERS 50
static rwlock_t rwlock;
SPINLOCK_INITIALIZE(lock);
static waitq_t can_start;
__u32 seed = 0xdeadbeef;
static __u32 random(__u32 max);
static void writer(void *arg);
static void reader(void *arg);
static void failed(void);
__u32 random(__u32 max)
{
__u32 rc;
spinlock_lock(&lock);
rc = seed % max;
seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
spinlock_unlock(&lock);
return rc;
}
void writer(void *arg)
{
int rc, to;
thread_detach(THREAD);
waitq_sleep(&can_start);
to = random(40000);
printf("cpu%d, tid %d w+ (%d)\n", CPU
->id
, THREAD
->tid
, to
);
rc = rwlock_write_lock_timeout(&rwlock, to);
if (SYNCH_FAILED(rc)) {
printf("cpu%d, tid %d w!\n", CPU
->id
, THREAD
->tid
);
return;
};
printf("cpu%d, tid %d w=\n", CPU
->id
, THREAD
->tid
);
if (rwlock.readers_in) panic("Oops.");
thread_usleep(random(1000000));
if (rwlock.readers_in) panic("Oops.");
rwlock_write_unlock(&rwlock);
printf("cpu%d, tid %d w-\n", CPU
->id
, THREAD
->tid
);
}
void reader(void *arg)
{
int rc, to;
thread_detach(THREAD);
waitq_sleep(&can_start);
to = random(2000);
printf("cpu%d, tid %d r+ (%d)\n", CPU
->id
, THREAD
->tid
, to
);
rc = rwlock_read_lock_timeout(&rwlock, to);
if (SYNCH_FAILED(rc)) {
printf("cpu%d, tid %d r!\n", CPU
->id
, THREAD
->tid
);
return;
}
printf("cpu%d, tid %d r=\n", CPU
->id
, THREAD
->tid
);
thread_usleep(30000);
rwlock_read_unlock(&rwlock);
printf("cpu%d, tid %d r-\n", CPU
->id
, THREAD
->tid
);
}
void failed(void)
{
printf("Test failed prematurely.\n");
thread_exit();
}
void test(void)
{
context_t ctx;
__u32 i, k;
printf("Read/write locks test #4\n");
waitq_initialize(&can_start);
rwlock_initialize(&rwlock);
for (; ;) {
thread_t *thrd;
context_save(&ctx);
printf("sp=%#x, readers_in=%d\n", ctx.
sp, rwlock.
readers_in);
k = random(7) + 1;
printf("Creating %d readers\n", k
);
for (i=0; i<k; i++) {
thrd = thread_create(reader, NULL, TASK, 0, "reader");
if (thrd)
thread_ready(thrd);
else
failed();
}
k = random(5) + 1;
printf("Creating %d writers\n", k
);
for (i=0; i<k; i++) {
thrd = thread_create(writer, NULL, TASK, 0, "writer");
if (thrd)
thread_ready(thrd);
else
failed();
}
thread_usleep(20000);
waitq_wakeup(&can_start, WAKEUP_ALL);
}
}