From a06ab205124885f233165fcc3bfd3c94397456b8 Mon Sep 17 00:00:00 2001
From: Tony Lawrence <al20878@gmail.com>
Date: Tue, 14 Jun 2022 15:39:55 -0400
Subject: [PATCH] TIMER: Support 1ms timer resolution in Cygwin

---
 makefile    | 5 +++++
 sim_timer.c | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/makefile b/makefile
index b7e78ebc..f26bc118 100644
--- a/makefile
+++ b/makefile
@@ -751,6 +751,11 @@ ifeq (${WIN32},)  #*nix Environments (&& cygwin)
     endif
     ifeq (cygwin,$(OSTYPE))
       LIBEXT = $(LIBEXTSAVE)
+      LIBPATH += /usr/lib/w32api
+      ifneq (,$(call find_lib,winmm))
+        OS_CCDEFS += -DHAVE_WINMM
+        OS_LDFLAGS += -lwinmm
+      endif
     endif
     ifeq (,$(findstring HAVE_LIBSDL,$(VIDEO_CCDEFS)))
       $(info *** Info ***)
diff --git a/sim_timer.c b/sim_timer.c
index dc46d902..227399b7 100644
--- a/sim_timer.c
+++ b/sim_timer.c
@@ -88,6 +88,9 @@
 #include "sim_defs.h"
 #include <ctype.h>
 #include <math.h>
+#ifdef HAVE_WINMM
+#include <windows.h>
+#endif
 
 #define SIM_INTERNAL_CLK (SIM_NTIMERS+(1<<30))
 #define SIM_INTERNAL_UNIT sim_internal_timer_unit
@@ -462,7 +465,7 @@ return 0;
 }
 #endif /* CLOCK_REALTIME */
 
-#elif defined (_WIN32)
+#elif defined (_WIN32)  ||  defined(HAVE_WINMM)
 
 /* Win32 routines */