SDL和X11多線程致命IO錯誤

Question

我試圖創建使用C++和SDL的簡單的多線程例子如下所示：

#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; 
} 

的問題是，當我在Eclipse或在終端運行它，我得到這個消息：

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

或者這一個：

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

我使用Ubuntu 13與Eclipse開普勒。我試圖做一些研究，但無法找到有用的東西。

編輯：所以我更新的代碼，包括櫃檯和幾個COUT的所有的地方：

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; 
     } 
    } 

，並在這裏一次運行之後是從控制檯輸出：

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. 

然後在第二次運行之後：

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. 

Answer 1

啊沒關係。我剛剛收到了一封電子郵件的回覆，我發送給了我正在遵循的教程的人：

是的，這是我正在修復SDL 2.0教程的應用程序中的錯誤。 查看有關修復的SDL 2.0多線程示例。問題是多線程SDL具有 渲染不起作用。因此，從另一個線程 設置標題不起作用。在2.0教程中，渲染在一個線程中，並且控制檯輸出 在另一個線程中。

Answer 2

如果有疑問，請執行所有SDL操作廣告。

主要的例外是SDL_PostEvent()。