/*
* 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;
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);
TPRINTF("cpu%u, tid %" PRIu64 " w+ (%d)\n", CPU->id, THREAD->tid, to);
rc = rwlock_write_lock_timeout(&rwlock, to);
if (SYNCH_FAILED(rc)) {
TPRINTF("cpu%u, tid %" PRIu64 " w!\n", CPU->id, THREAD->tid);
atomic_dec(&thread_count);
return;
}
TPRINTF("cpu%u, tid %" PRIu64 " w=\n", CPU->id, THREAD->tid);
if (rwlock.readers_in) {
TPRINTF("Oops.\n");
atomic_inc(&threads_fault);
atomic_dec(&thread_count);
return;
}
thread_usleep(random(1000000));
if (rwlock.readers_in) {
TPRINTF("Oops.\n");
atomic_inc(&threads_fault);
atomic_dec(&thread_count);
return;
}
rwlock_write_unlock(&rwlock);
TPRINTF("cpu%u, tid %" PRIu64 " 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);
TPRINTF("cpu%u, tid %" PRIu64 " r+ (%d)\n", CPU->id, THREAD->tid, to);
rc = rwlock_read_lock_timeout(&rwlock, to);
if (SYNCH_FAILED(rc)) {
TPRINTF("cpu%u, tid %" PRIu64 " r!\n", CPU->id, THREAD->tid);
atomic_dec(&thread_count);
return;
}
TPRINTF("cpu%u, tid %" PRIu64 " r=\n", CPU->id, THREAD->tid);
thread_usleep(30000);
rwlock_read_unlock(&rwlock);
TPRINTF("cpu%u, tid %" PRIu64 " r-\n", CPU->id, THREAD->tid);
atomic_dec(&thread_count);
}
char *test_rwlock4(void)
{
context_t ctx;
uint32_t i;
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);
TPRINTF("sp=%#x, readers_in=%" PRIs "\n", ctx.sp, rwlock.readers_in);
TPRINTF("Creating %" PRIu32 " readers\n", rd);
for (i = 0; i < rd; i++) {
thrd = thread_create(reader, NULL, TASK, 0, "reader", false);
if (thrd)
thread_ready(thrd);
else
TPRINTF("Could not create reader %" PRIu32 "\n", i);
}
TPRINTF("Creating %" PRIu32 " writers\n", wr);
for (i = 0; i < wr; i++) {
thrd = thread_create(writer, NULL, TASK, 0, "writer", false);
if (thrd)
thread_ready(thrd);
else
TPRINTF("Could not create writer %" PRIu32 "\n", i);
}
thread_usleep(20000);
waitq_wakeup(&can_start, WAKEUP_ALL);
while (atomic_get(&thread_count) > 0) {
TPRINTF("Threads left: %ld\n", atomic_get(&thread_count));
thread_sleep(1);
}
if (atomic_get(&threads_fault) == 0)
return NULL;
return "Test failed";
}