* cygheap.cc (init_cygheap::find_tls): Add a comment.

* dcrt0.cc (parent_sigmask): Delete.
(dll_crt0_1): Use spawn_info->moreinfo->sigmask rather than saved parent signal
mask.
* thread.cc (pthread::thread_init_wrapper): Add comment stressing the
importance of maintaining ordering of statements.

winsup/cygwin/cygheap.cc

@@ -628,6 +628,7 @@ init_cygheap::find_tls (int sig, bool& issig_wait)
   else
     {
       ix = -1;
+      /* Scan thread list looking for valid signal-delivery candidates */
       while (++ix < (int) nthreads)
 	if (!threadlist[ix]->tid)
 	  continue;