fixup! Benchmark: emulate clock_gettime(2) on Windows

test/benchmark.c

@@ -130,18 +130,30 @@ timediff_sec (base64_timespec *start, base64_timespec *end)
 
 	return (float)((diff * tb.numer) / tb.denom) / 1e9f;
 }
-#elif defined(_WIN32) && !(defined(__MINGW32__) || defined(__MINGW64__))
-typedef struct timespec base64_timespec;
+#elif defined(_WIN32)
+typedef ULARGE_INTEGER base64_timespec;
+
 static void
 base64_gettime (base64_timespec *o_time)
 {
-	timespec_get(o_time, TIME_UTC);
+	FILETIME current_time_ft;
+
+	GetSystemTimePreciseAsFileTime(&current_time_ft);
+
+	o_time->LowPart  = current_time_ft.dwLowDateTime;
+	o_time->HighPart = current_time_ft.dwHighDateTime;
 }
 
 static float
 timediff_sec (base64_timespec *start, base64_timespec *end)
 {
-	return (end->tv_sec - start->tv_sec) + ((float)(end->tv_nsec - start->tv_nsec)) / 1e9f;
+	float ssec  = start->QuadPart / 10000000f;
+	float snsec = (start->QuadPart % 10000000f) * 100f;
+
+	float esec  = end->QuadPart / 10000000f;
+	float ensec = (end->QuadPart % 10000000f) * 100f;
+
+	return (esec - ssec) + (ensec - snsec) / 1e9f;
 }
 #else
 typedef struct timespec base64_timespec;

test/gettime_win.c

@@ -0,0 +1,46 @@
+#include <windows.h>
+#include <time.h>
+
+#ifndef CLOCK_REALTIME
+#define CLOCK_REALTIME 2
+#endif
+
+/* Number of 100 ns intervals from January 1, 1601 till January 1, 1970. */
+#define UNIX_EPOCH 116444736000000000ULL
+
+#ifndef _TIMESPEC_DEFINED
+struct timespec {
+	time_t tv_sec;
+	long tv_nsec;
+};
+#endif
+
+static ULARGE_INTEGER
+xgetfiletime (void)
+{
+	ULARGE_INTEGER current_time;
+	FILETIME current_time_ft;
+
+	/* Returns current time in UTC as a 64-bit value representing the number
+	* of 100-nanosecond intervals since January 1, 1601 . */
+	GetSystemTimePreciseAsFileTime(&current_time_ft);
+	current_time.LowPart = current_time_ft.dwLowDateTime;
+	current_time.HighPart = current_time_ft.dwHighDateTime;
+
+	return current_time;
+}
+
+static int
+clock_gettime (clock_t id, struct timespec* ts)
+{
+	if (id != CLOCK_REALTIME)
+		return -1;
+
+	ULARGE_INTEGER current_time = xgetfiletime();
+
+	/* Time from Epoch to now. */
+	ts->tv_sec = (current_time.QuadPart - UNIX_EPOCH) / 10000000;
+	ts->tv_nsec = ((current_time.QuadPart - UNIX_EPOCH) % 10000000) * 100;
+
+	return 0;
+}