* DevNotes: Add entry cgf-000006.

* thread.cc (pthread::pop_cleanup_handler): Set cancel state to disabled to
avoid recursively waiting for cancel.

winsup/cygwin/thread.cc

@@ -1057,6 +1057,9 @@ pthread::pop_cleanup_handler (int const execute)
 
   mutex.lock ();
 
+  /* We will no honor cancels since the thread is exiting.  */
+  cancelstate = PTHREAD_CANCEL_DISABLE;
+
   if (cleanup_stack != NULL)
     {
       __pthread_cleanup_handler *handler = cleanup_stack;