test/testlock.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 11 Mar 2015 21:14:21 +0100
changeset 9380 07b7c1005a23
parent 9356 e87d6e1e812a
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Updated internal documentation comments.
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/*
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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/* Test the thread and mutex locking functions
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   Also exercises the system's signal/thread interaction
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h> /* for atexit() */
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#include "SDL.h"
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static SDL_mutex *mutex = NULL;
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static SDL_threadID mainthread;
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static SDL_Thread *threads[6];
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static volatile int doterminate = 0;
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/*
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 * SDL_Quit() shouldn't be used with atexit() directly because
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 *  calling conventions may differ...
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 */
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static void
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SDL_Quit_Wrapper(void)
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{
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    SDL_Quit();
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}
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void
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printid(void)
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{
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    SDL_Log("Process %lu:  exiting\n", SDL_ThreadID());
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}
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void
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terminate(int sig)
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{
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    signal(SIGINT, terminate);
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    doterminate = 1;
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}
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void
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closemutex(int sig)
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{
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    SDL_threadID id = SDL_ThreadID();
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    int i;
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    SDL_Log("Process %lu:  Cleaning up...\n", id == mainthread ? 0 : id);
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    doterminate = 1;
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    for (i = 0; i < 6; ++i)
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        SDL_WaitThread(threads[i], NULL);
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    SDL_DestroyMutex(mutex);
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    exit(sig);
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}
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int SDLCALL
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Run(void *data)
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{
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    if (SDL_ThreadID() == mainthread)
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        signal(SIGTERM, closemutex);
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    while (!doterminate) {
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        SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
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        if (SDL_LockMutex(mutex) < 0) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
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            exit(1);
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        }
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        SDL_Log("Process %lu, working!\n", SDL_ThreadID());
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        SDL_Delay(1 * 1000);
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        SDL_Log("Process %lu, done!\n", SDL_ThreadID());
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        if (SDL_UnlockMutex(mutex) < 0) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
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            exit(1);
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        }
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        /* If this sleep isn't done, then threads may starve */
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        SDL_Delay(10);
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    }
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    if (SDL_ThreadID() == mainthread && doterminate) {
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        SDL_Log("Process %lu:  raising SIGTERM\n", SDL_ThreadID());
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        raise(SIGTERM);
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    }
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    return (0);
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}
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int
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main(int argc, char *argv[])
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{
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    int i;
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    int maxproc = 6;
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	/* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Load the SDL library */
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    if (SDL_Init(0) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
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        exit(1);
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    }
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    atexit(SDL_Quit_Wrapper);
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    if ((mutex = SDL_CreateMutex()) == NULL) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
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        exit(1);
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    }
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    mainthread = SDL_ThreadID();
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    SDL_Log("Main thread: %lu\n", mainthread);
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    atexit(printid);
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    for (i = 0; i < maxproc; ++i) {
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        char name[64];
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        SDL_snprintf(name, sizeof (name), "Worker%d", i);
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        if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
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    }
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    signal(SIGINT, terminate);
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    Run(NULL);
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    return (0);                 /* Never reached */
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}