Merge branch 'footprints-on-the-sands-of-time' of github.com:ctiller/grpc into footprints-on-the-sands-of-time

src/core/support/time_win32.c

@@ -41,12 +41,34 @@
 #include <sys/timeb.h>
 #include <windows.h>
 
-gpr_timespec gpr_now(void) {
+static LARGE_INTEGER g_start_time;
+static double g_time_scale;
+
+void gpr_time_init(void) {
+  LARGE_INTEGER frequency;
+  QueryPerformanceFrequency(&frequency);
+  QueryPerformanceCounter(&g_start_time);
+  g_time_scale = 1.0 / frequency.QuadPart;
+}
+
+gpr_timespec gpr_now(gpr_clock_type clock) {
   gpr_timespec now_tv;
   struct _timeb now_tb;
-  _ftime_s(&now_tb);
-  now_tv.tv_sec = now_tb.time;
-  now_tv.tv_nsec = now_tb.millitm * 1000000;
+  LARGE_INTEGER timestamp;
+  double now_dbl;
+  switch (clock) {
+    case GPR_CLOCK_REALTIME:
+	    _ftime_s(&now_tb);
+	    now_tv.tv_sec = now_tb.time;
+	    now_tv.tv_nsec = now_tb.millitm * 1000000;
+	    break;
+	  case GPR_CLOCK_MONOTONIC:
+	    QueryPerformanceCounter(&timestamp);
+      now_dbl = (timestamp.QuadPart - g_start_time.QuadPart) * g_time_scale;
+      now_tv.tv_sec = (time_t)now_dbl;
+      now_tv.tv_nsec = (int)((now_dbl - (double)now_tv.tv_sec) * 1e9);
+      break;
+  }
   return now_tv;
 }