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-rw-r--r--src/metrics.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/src/metrics.h b/src/metrics.h
index af6e9a2..dae6b9f 100644
--- a/src/metrics.h
+++ b/src/metrics.h
@@ -33,6 +33,7 @@ struct Metric {
int64_t sum;
};
+
/// A scoped object for recording a metric across the body of a function.
/// Used by the METRIC_RECORD macro.
struct ScopedMetric {
@@ -57,6 +58,30 @@ private:
vector<Metric*> metrics_;
};
+/// Get the current time as relative to some epoch.
+/// Epoch varies between platforms; only useful for measuring elapsed
+/// time.
+int64_t GetTimeMillis();
+
+
+/// A simple stopwatch which retruns the time
+// in seconds since Restart() was called
+class Stopwatch
+{
+public:
+ Stopwatch() : started_(0) {}
+
+ /// Seconds since Restart() call
+ double Elapsed() const { return 1e-6 * (Now() - started_); }
+
+ void Restart() { started_ = Now(); }
+
+private:
+ uint64_t started_;
+ uint64_t Now() const;
+};
+
+
/// The primary interface to metrics. Use METRIC_RECORD("foobar") at the top
/// of a function to get timing stats recorded for each call of the function.
#define METRIC_RECORD(name) \