kc3-lang/SDL/test/torturethread.c

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• Hash : 120c76c8
  Author :
  Date : 2022-01-03T09:40:00
  

  Updated copyright for 2022

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• test/torturethread.c

• /*
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  /* Simple test of the SDL threading code */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <signal.h>
  #include <string.h>
  
  #include "SDL.h"
  
  #define NUMTHREADS 10
  
  static SDL_atomic_t time_for_threads_to_die[NUMTHREADS];
  
  /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
  static void
  quit(int rc)
  {
      SDL_Quit();
      exit(rc);
  }
  
  int SDLCALL
  SubThreadFunc(void *data)
  {
      while (!*(int volatile *) data) {
          ;                       /* SDL_Delay(10); *//* do nothing */
      }
      return 0;
  }
  
  int SDLCALL
  ThreadFunc(void *data)
  {
      SDL_Thread *sub_threads[NUMTHREADS];
      int flags[NUMTHREADS];
      int i;
      int tid = (int) (uintptr_t) data;
  
      SDL_Log("Creating Thread %d\n", tid);
  
      for (i = 0; i < NUMTHREADS; i++) {
          char name[64];
          SDL_snprintf(name, sizeof (name), "Child%d_%d", tid, i);
          flags[i] = 0;
          sub_threads[i] = SDL_CreateThread(SubThreadFunc, name, &flags[i]);
      }
  
      SDL_Log("Thread '%d' waiting for signal\n", tid);
      while (SDL_AtomicGet(&time_for_threads_to_die[tid]) != 1) {
          ;                       /* do nothing */
      }
  
      SDL_Log("Thread '%d' sending signals to subthreads\n", tid);
      for (i = 0; i < NUMTHREADS; i++) {
          flags[i] = 1;
          SDL_WaitThread(sub_threads[i], NULL);
      }
  
      SDL_Log("Thread '%d' exiting!\n", tid);
  
      return 0;
  }
  
  int
  main(int argc, char *argv[])
  {
      SDL_Thread *threads[NUMTHREADS];
      int i;
  
      /* Enable standard application logging */
      SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
  
      /* Load the SDL library */
      if (SDL_Init(0) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
          return (1);
      }
  
      signal(SIGSEGV, SIG_DFL);
      for (i = 0; i < NUMTHREADS; i++) {
          char name[64];
          SDL_snprintf(name, sizeof (name), "Parent%d", i);
          SDL_AtomicSet(&time_for_threads_to_die[i], 0);
          threads[i] = SDL_CreateThread(ThreadFunc, name, (void*) (uintptr_t) i);
  
          if (threads[i] == NULL) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
              quit(1);
          }
      }
  
      for (i = 0; i < NUMTHREADS; i++) {
          SDL_AtomicSet(&time_for_threads_to_die[i], 1);
      }
  
      for (i = 0; i < NUMTHREADS; i++) {
          SDL_WaitThread(threads[i], NULL);
      }
      SDL_Quit();
      return (0);
  }
  

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