I just noticed this had made it here. I pasted below a reproducer app. The
thread blocks until a key is pressed.
About the patch itself, it looks like the assumption of the patch is also
made on xcb_io.c, line 347, where it is more cautiously called a
"reasonable claim".
#include <X11/Xlib.h>
#include <stdio.h>
#include <pthread.h>
Display* d;
void* thread(void *ptr)
{
int actualCount;
XListFonts(d, "", 1, &actualCount);
printf("thread finished\n");
}
int main(void) {
pthread_t t;
XEvent e;
Window w;
int s;
XInitThreads();
d = XOpenDisplay(NULL);
s = DefaultScreen(d);
w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
BlackPixel(d, s), WhitePixel(d, s));
XSelectInput(d, w, KeyPressMask);
XMapWindow(d, w);
pthread_create( &t, NULL, thread, NULL);
while (1) {
XNextEvent(d, &e);
if (e.type == KeyPress)
break;
}
XCloseDisplay(d);
printf("main finished\n");
return 0;
}
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