* cygtls.cc (_threadinfo::remove): Don't assume that we are removing _my_tls.

* exceptions.cc (setup_handler): Improve debugging output.
(call_signal_handler_now): Remove ill-advised debugger call.
* sigproc.cc (sigcomplete_main): Delete.
(sig_send): Honor FIXME and avoid using main thread's completion event for
everything or suffer races.
(pending_signals::add): Default stored mask to current process mask rather than
mask at time of signal send.
(wait_sig): Add debugging output.
* sigproc.h (sigpacket::mask_storage): Delete.

winsup/cygwin/sigproc.h

@@ -55,7 +55,6 @@ struct sigpacket
   pid_t pid;
   class _threadinfo *tls;
   sigset_t *mask;
-  sigset_t mask_storage;
   union
   {
     HANDLE wakeup;