test/testlock.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 18 Feb 2015 21:31:21 +0100
changeset 9356 e87d6e1e812a
parent 8149 681eb46b8ac4
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Removed redundant include statements from test programs. The needed header files are already included with SDL.h. Still including them in the test programs is confusing because it somehow suggests they would be needed.
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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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}