mutex.c

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/* -*- C -*- */
/*
 * Copyright (c) 2011-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#include "ut/ut.h"
#include "lib/thread.h"
#include "lib/mutex.h"
#include "lib/assert.h"

enum {
        NR = 255
};

static int counter;
static struct m0_thread t[NR];
static struct m0_mutex  m[NR];
static struct m0_mutex  static_m = M0_MUTEX_SINIT(&static_m);

static void t0(int n)
{
        int i;

        for (i = 0; i < NR; ++i) {
                m0_mutex_lock(&m[0]);
                counter += n;
                m0_mutex_unlock(&m[0]);
        }
}

static void t1(int n)
{
        int i;
        int j;

        for (i = 0; i < NR; ++i) {
                for (j = 0; j < NR; ++j)
                        m0_mutex_lock(&m[j]);
                counter += n;
                for (j = 0; j < NR; ++j)
                        m0_mutex_unlock(&m[j]);
        }
}

static void static_mutex_test(void)
{
        m0_mutex_lock(&static_m);
        m0_mutex_unlock(&static_m);
}

void test_mutex(void)
{
        int i;
        int sum;
        int result;

        counter = 0;

        for (sum = i = 0; i < NR; ++i) {
                m0_mutex_init(&m[i]);
                result = M0_THREAD_INIT(&t[i], int, NULL, &t0, i, "t0");
                M0_UT_ASSERT(result == 0);
                sum += i;
        }

        for (i = 0; i < NR; ++i) {
                m0_thread_join(&t[i]);
                m0_thread_fini(&t[i]);
        }

        M0_UT_ASSERT(counter == sum * NR);

        counter = 0;

        for (sum = i = 0; i < NR; ++i) {
                result = M0_THREAD_INIT(&t[i], int, NULL, &t1, i, "t1");
                M0_UT_ASSERT(result == 0);
                sum += i;
        }

        for (i = 0; i < NR; ++i) {
                m0_thread_join(&t[i]);
                m0_thread_fini(&t[i]);
        }

        for (i = 0; i < NR; ++i)
                m0_mutex_fini(&m[i]);

        M0_UT_ASSERT(counter == sum * NR);

        static_mutex_test();
}


/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */