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/*

 * 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";

}