/* Copyright (C) 2012-2013 Zeex
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <time.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

time_t timer_clock(void) {
  LARGE_INTEGER freq, count;

  if (!QueryPerformanceFrequency(&freq)) {
    return 0;
  }

  if (!QueryPerformanceCounter(&count)) {
    return 0;
  }

  return (time_t)(1000.0L / freq.QuadPart * count.QuadPart);;
}

/* Copyright (C) 2012-2013 Zeex
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <time.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

time_t timer_clock(void) {
  return GetTickCount();
}

--- 
+++ 
@@ -18,5 +18,15 @@
 #include <windows.h>
 
 time_t timer_clock(void) {
-  return GetTickCount();
+  LARGE_INTEGER freq, count;
+
+  if (!QueryPerformanceFrequency(&freq)) {
+    return 0;
+  }
+
+  if (!QueryPerformanceCounter(&count)) {
+    return 0;
+  }
+
+  return (time_t)(1000.0L / freq.QuadPart * count.QuadPart);;
 }
Use QueryPerformanceCounter() timer instead of GetTickCount()

GetTickCount() has poor resolution according to MSDN docs (from
10 to 16 ms).
