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    Very rarely-used function. This function is used to emit an expose event signals on a widget. This function is not normally used directly...
    If you want to force an area of a window to be redrawn, use gdk_window_invalidate_rect() or gdk_window_invalidate_region(). To cause the redraw to be done immediately, follow that call with a call to gdk_window_process_updates().
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    ¼ÌÐø°Ù¶È£¬·¢ÏÖÁËXFlushÕâ¸öº¯Êý£¬µ÷ÓÃÁËÏ£¬XFlush (GDK_WINDOW_XDISPLAY (draw_area->window));¹ûÈ»¿ÉÒÔ£¬²»¹ýÓÖÓöµ½ÁËÒ»¸öÎÊÌ⣬³ÌÐòÔËÐÐÒ»¶Îʱ¼äÖ®ºó£¬¾Íû·´Ó¦ÁË£¬ÎÒ°´ÁËϼüÅÌ£¬³ÌÐò¾Í±ÀÀ£ÁË£¬ÖÕ¶ËÊä³öÁ˸öÌáʾ£¬fatal io error 11£¬×ÊÔ´²»¹»Óð¡Ö®ÀàµÄ´íÎó£¬ÎÒÏ뺯ÊýÓ¦¸Ã²»»á³öÎÊÌ⣬Ï̺߳ͻæÍ¼Ö®¼äµÄ½»´íÖ´Ðе¹ÊÇÈÃÎҸоõ²»Í×£¬ÓÃGDBµ÷ÊÔµÄʱºò£¬¶ÏµãÒ»»á½øÈëÏ̺߳¯Êý£¬Ò»»á½øÈë»æÍ¼º¯Êý£¬ÎÒÏëÎÊÌâ´ó¸Å¾Í³öÔÚÕâÀÓÖ²éÁËЩÏ̵߳Ä×ÊÁÏ£¬²¹³äºóµÄ´úÂëÈçÏ£º
int main (int argc, char *argv[])
{
if (!g_thread_supported ())
{
g_thread_init (NULL);
}
gdk_threads_init ();
gtk_init (&argc, &argv);
......
gdk_threads_enter ();
gtk_main ();
gdk_threads_leave ();
}
void thread_monitor (void *arg)
{
while (1)
{
gdk_threads_enter ();
gdk_window_invalidate_rect (draw_area->window,
NULL, FALSE);
gdk_window_process_updates (draw_area->window,
FALSE);
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