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scoutos / prex-0.9.0 / usr / test / mutex / mutex.c @ 03e9c04a

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/*
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 * Copyright (c) 2005, Kohsuke Ohtani
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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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 * 1. 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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 * 2. 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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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/*
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 * mutex.c - test priority inheritance of mutex.
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 */
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#include <sys/prex.h>
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#include <stdio.h>
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static mutex_t mtx_A = MUTEX_INITIALIZER;
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static mutex_t mtx_B, mtx_C;
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int
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main(int argc, char *argv[])
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{
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        int error;
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        printf("Mutex test program\n");
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        /*
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         * Initialize only B
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         */
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        mutex_init(&mtx_B);
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        /*
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         * Lock test
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         */
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        error = mutex_lock(&mtx_A);
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        printf("1) Lock mutex A: error=%d\n", error);
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        error = mutex_lock(&mtx_B);
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        printf("2) Lock mutex B: error=%d\n", error);
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        /* Error: Mutex C is not initialized. */
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        error = mutex_lock(&mtx_C);
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        printf("3e) Lock mutex C: error=%d\n", error);
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        /*
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         * Unlock test
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         */
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        error = mutex_unlock(&mtx_A);
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        printf("4) Unlock mutex A: error=%d\n", error);
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        error = mutex_unlock(&mtx_B);
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        printf("5) Unlock mutex B: error=%d\n", error);
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        /* Error: Mutex C is not initialized. */
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        error = mutex_unlock(&mtx_C);
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        printf("6e) Unlock mutex B: error=%d\n", error);
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        /* Error: B is not locked. */
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        error = mutex_unlock(&mtx_B);
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        printf("7e) Unlock mutex B: error=%d\n", error);
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        /*
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         * Destoroy mutex.
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         */
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        mutex_destroy(&mtx_B);
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        /* Error: Mutex B is destoroyed. */
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        error = mutex_lock(&mtx_B);
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        printf("8e) Lock mutex B: error=%d\n", error);
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        /*
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         * Double lock test
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         */
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        error = mutex_lock(&mtx_A);
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        printf("9) Lock mutex A: error=%d\n", error);
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        /* Erorr: Mutex A is already locked */
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        error = mutex_lock(&mtx_A);
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        printf("10e) Lock mutex A: error=%d\n", error);
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        error = mutex_unlock(&mtx_A);
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        printf("11) Unlock mutex A: error=%d\n", error);
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        printf("Test completed...\n");
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        return 0;
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}