* cygheap.h (init_cygheap::_gtod): New hires_ms element.

* hires.h (hires_ms::minperiod): Remove static designation.
(hires::began_period): New field.
* signal.cc: Include headers required for cygheap.h now that gtod lives in the
cygheap.
* timer.c: Ditto.
* times.cc (gtod): Delete variable.
(gtod::minperiod): Ditto.
(gtod::began_period): Define.
(hires_ms::prime): Add more debugging output.  Call timeBeginPeriod only when
!began_period.

winsup/cygwin/cygheap.h

@@ -8,6 +8,8 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
+#include "hires.h"
+
 #undef cfree
 
 enum cygheap_types
@@ -298,6 +300,7 @@ struct init_cygheap
   pid_t pid;			/* my pid */
   HANDLE pid_handle;		/* handle for my pid */
   hook_chain hooks;
+  hires_ms _gtod;
   void close_ctty ();
 };