From c97ede5c3466a34f3537a198a88c65525e3f0749 Mon Sep 17 00:00:00 2001
From: Dick Hollenbeck <dick@softplc.com>
Date: Fri, 13 Jan 2012 11:11:34 -0600
Subject: [PATCH] fix windows version of GetRunningMicroSecs()

---
 common/getrunningmicrosecs.cpp | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/common/getrunningmicrosecs.cpp b/common/getrunningmicrosecs.cpp
index 895b2bc26d..12082fae3e 100644
--- a/common/getrunningmicrosecs.cpp
+++ b/common/getrunningmicrosecs.cpp
@@ -40,23 +40,34 @@ unsigned GetRunningMicroSecs()
 
 unsigned GetRunningMicroSecs()
 {
-    LARGE_INTEGER   curtime;
+    FILETIME    now;
 
-    static unsigned timerFreq;              // timer frequency
+    GetSystemTimeAsFileTime( &now );
 
-    if( !timerFreq )
-    {
-        QueryPerformanceFrequency( &curtime );
+    typedef unsigned long long UINT64;
 
-        timerFreq = curtime.QuadPart / 1000000;     // i.e., ticks per usec
+    UINT64 t = (UINT64(now.dwHighDateTime) << 32) + now.dwLowDateTime;
 
-        assert( timerFreq );
-    }
+    t /= 10;
 
-    QueryPerformanceCounter( &curtime );
-
-    return ( curtime.LowPart / timerFreq );
+    return unsigned( t );
 }
 
+
+#if 0
+// test program
+#include <stdio.h>
+int main( int argc, char** argv )
+{
+    unsigned then = GetRunningMicroSecs();
+
+    Sleep( 2000 );      // Windows Sleep( msecs )
+
+    printf( "delta: %u\n", GetRunningMicroSecs() - then );
+
+    return 0;
+}
+#endif
+
 #endif