c++ - SDL および X11 マルチスレッドの致命的な IO エラー

Question

ここに示すように、C++ と SDL を使用して単純なマルチスレッドの例を作成しようとしています。

#include <iostream>
#include "SDL/SDL_image.h"
#include "SDL/SDL.h"
#include "SDL/SDL_thread.h"
#include "X11/Xlib.h"
#include "SDLAbstractionLayer.h"
#include <string>

using namespace std;

SDL_Thread* thread = NULL;
bool quit = false;

int myThread(void* data) {
   while (!quit) {
      //caption animation
      SDL_WM_SetCaption ("Thread is running", NULL);
      SDL_Delay(250);

      SDL_WM_SetCaption("Thread is running.", NULL);
      SDL_Delay(250);

      SDL_WM_SetCaption("Thread is running..", NULL);
      SDL_Delay(250);

      SDL_WM_SetCaption("Thread is running...", NULL);
      SDL_Delay(250);
   }

   return 0;
}

int main(int argc, char* argv[]) {
   SDL_Surface* screen = init(640, 480, "");
   XInitThreads();

   Surface test("resources/image.png");
   thread = SDL_CreateThread(myThread, NULL);
   SDL_Event event;

   while (!quit) {
      if(SDL_PollEvent(&event)) {
         if (event.type == SDL_QUIT) {
            quit = true;
            break;
         }

         fillScreen(screen, Surface::WHITE);
         applySurface(0, 0, test, screen);
         flip(screen);
      }
   }

   cleanUp();
   SDL_KillThread(thread);

   return 0;
}

問題は、Eclipse またはターミナルで実行すると、次のメッセージが表示されることです。

XIO:  fatal IO error 0 (Success) on X server ":0.0"
  after 113 requests (113 known processed) with 0 events remaining.

またはこれ：

XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0"
  after 113 requests (113 known processed) with 2 events remaining.

Eclipse Kepler で Ubuntu 13 を使用しています。いくつかの調査を試みましたが、有用なものを見つけることができませんでした。

編集：そこで、コードを更新して、カウンターといくつかのカウトをいたるところに含めました：

int myThread(void* data) {
   while (!quit) {
      //caption animation
      SDL_WM_SetCaption ("Thread is running", NULL);
      SDL_Delay(250);

      cout << "Thread is running 1" << endl;

      SDL_WM_SetCaption("Thread is running.", NULL);
      SDL_Delay(250);

      cout << "Thread is running 2" << endl;

      SDL_WM_SetCaption("Thread is running..", NULL);
      SDL_Delay(250);

      cout << "Thread is running 3" << endl;

      SDL_WM_SetCaption("Thread is running...", NULL);
      SDL_Delay(250);

      cout << "Thread is running 4" << endl;
   }

   return 0;
}

int main(int argc, char* argv[]) {
   SDL_Surface* screen = init(640, 480, "");
   XInitThreads();

   Surface test("resources/image.png");
   thread = SDL_CreateThread(myThread, NULL);
   SDL_Event event;
   int count = 1;

   while (!quit) {
      if(SDL_PollEvent(&event)) {
         if (event.type == SDL_QUIT) {
            quit = true;
            break;
         }

         fillScreen(screen, Surface::WHITE);
         applySurface(0, 0, test, screen);
         flip(screen);

         cout << "finished iteration " << count++ << endl;
      }
   }

一度実行した後のコンソールからの出力は次のとおりです。

finished iteration 1
Thread is running 1
XIO:  fatal IO error 0 (Success) on X server ":0.0"
      after 113 requests (113 known processed) with 0 events remaining.

次に、もう一度実行した後：

finished iteration 1
finished iteration 2
Thread is running 1
Thread is running 2
XIO:  fatal IO error 0 (Success) on X server ":0.0"
      after 116 requests (116 known processed) with 0 events remaining.