* cygthread.h (cygthread::terminate_thread): Reflect return value.

* cygthread.cc (cygthread::detach): Be more careful about ensuring that sigwait
is properly waited for to avoid later missynchronization.
(cygthread::terminate_thread): Return true if thread was actually terminated
and all handles were closed.
* fhandler_base.cc (fhandler_base::raw_read): Use signal_read_state rather than
raw calls to win32 api.
(fhandler_base::read): Ditto.
* fhandler.h (fhandler_pipe::fixup_after_exec): Use method to create read_state
signalling.
(fhandler_pipe::create): Ditto.
* Makefile.in: Make some more files -fomit-frame-pointer.

winsup/cygwin/cygthread.h

@@ -27,7 +27,7 @@ class cygthread
   bool is_freerange;
   static bool exiting;
  public:
-  void terminate_thread ();
+  bool terminate_thread ();
   static DWORD WINAPI stub (VOID *);
   static DWORD WINAPI simplestub (VOID *);
   static DWORD main_thread_id;