* sigproc.cc (remove_proc): Don't do busy loop when execing since thread could

have been terminated prior to setting flag.
* signal.cc (sigwaitinfo): Zero event before closing to signal other threads
that it is no longer available.

winsup/cygwin/signal.cc

@@ -608,6 +608,8 @@ sigwaitinfo (const sigset_t *set, siginfo_t *info)
       __seterrno ();
       res = -1;
     }
+
+  _my_tls.event = NULL;
   CloseHandle (h);
   sigproc_printf ("returning signal %d", res);
   return res;