add MonotonicTimer

asmuth · Jul 22, 2017 · 896b40d · 896b40d
1 parent 00efa3c
commit 896b40d
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Showing 2 changed files with 35 additions and 0 deletions.
diff --git a/src/showtime/util/time.cc b/src/showtime/util/time.cc
@@ -74,6 +74,24 @@ uint64_t MonotonicClock::now() {
 #endif
 }
 
+MonotonicTimer::MonotonicTimer() { reset(); }
+
+MonotonicTimer::Tick MonotonicTimer::next() {
+  auto tB = MonotonicClock::now();
+  auto t = tB - t0_;
+  auto dt = tB - tA_;
+  tA_ = tB;
+
+  return Tick {
+    .t = t,
+    .dt = dt
+  };
+}
+
+void MonotonicTimer::reset() {
+  t0_ = tA_ = MonotonicClock::now();
+}
+
 UnixTime::UnixTime() :
     utc_micros_(WallClock::unixMicros()) {}
 

diff --git a/src/showtime/util/time.h b/src/showtime/util/time.h
@@ -58,6 +58,23 @@ class MonotonicClock {
   static uint64_t now();
 };
 
+class MonotonicTimer {
+public:
+
+  struct Tick {
+    uint64_t t;
+    uint64_t dt;
+  };
+
+  MonotonicTimer();
+  Tick next();
+  void reset();
+
+protected:
+  uint64_t t0_;
+  uint64_t tA_;
+};
+
 class UnixTime {
 public: