Merge pull request #7 from theoleblond/PollSleep

Sleep 1 millisecond in poll() to avoid busy wait

compat/win32/poll.c

@@ -597,7 +597,9 @@ restart:
 
   if (!rc && timeout == INFTIM)
     {
-      SwitchToThread();
+      /* Sleep 1 millisecond to avoid busy wait */
+      SleepEx(1, TRUE);
+
       goto restart;
     }