Attachment 44413 Details for Bug 20708 – Sample code to trigger the deadlock

Sample code to trigger the deadlock

xcb_test.c (text/x-csrc), 1.71 KB, created by Reinhard Nißl on 2011-03-13 05:51:38 UTC

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Creator: Reinhard Nißl

Created: 2011-03-13 05:51:38 UTC

Size: 1.71 KB

patch

obsolete

>
>// Compile: gcc -g3 -Wall xcb_test.c -o xcb_test -lX11 -lpthread 
>
>#include "stdio.h"
>#include "X11/Xlib.h"
>#include "pthread.h"
>#include "unistd.h"
>
>
>
>int run_threads = 1;
>
>
>
>void *vdpau_thread3(void *param)
>{
>  Display *display = (Display *)param;
>//return 0;
>  do
>  {
>    fprintf(stderr, ".");
>    XSync(display, 0);
>  }
>  while (run_threads);
>
>  return 0;
>}
>
>
>
>void *vdpau_thread5(void *param)
>{
>  Display *display = (Display *)param;
>
>  Window window = XCreateSimpleWindow(display, XDefaultRootWindow(display), 300, 100, 100, 100, 1, 0, 0);
>  XMapRaised(display, window);
>
>  do
>  {
>    int x, y;
>    Window child;
>    fprintf(stderr, "T");
>    XLockDisplay(display); // this Lock/Unlock pair causes the deadlock
>    XTranslateCoordinates(display, window, window, 50, 50, &x, &y, &child);
>    XUnlockDisplay(display);
>  }
>  while (run_threads);
>
>  XUnmapWindow(display, window);
>  XDestroyWindow(display, window);
>  return 0;
>}
>
>
>
>int main()
>{
>  XInitThreads();
>
>  Display *display = XOpenDisplay(NULL);
>  if (display)
>  {
>      pthread_t thread3;
>      pthread_t thread5;
>      int err3;
>      int err5;
>
>      fprintf(stderr, "press enter to start and later again to stop\n");
>      getchar();
>
>      if ((err3 = pthread_create(&thread3, 0, &vdpau_thread3, (void *)display)) != 0)
>        fprintf(stderr, "failed to create xsync thread\n");
>
>      if ((err5 = pthread_create(&thread5, 0, &vdpau_thread5, (void *)display)) != 0)
>        fprintf(stderr, "failed to create window thread\n");
>
>      getchar();
>      run_threads = 0;
>
>      if (!err3)
>        pthread_join(thread3, 0);
>
>      if (!err5)
>        pthread_join(thread5, 0);
>
>    XCloseDisplay(display);
>  }
>  else
>    fprintf(stderr, "XOpenDisplay(NULL) failed!\n");
>
>  return 0;
>}
>

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Attachments on bug 20708: 23963 | 44413 | 44414 | 44621

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