add Timer

src/core/Timer.cc

@@ -0,0 +1,31 @@
+#include "Timer.h"
+#include <sys/time.h>
+#include <stdio.h>
+
+static long get_usec()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return tv.tv_sec * 1000000 + tv.tv_usec;
+}
+
+Timer::Timer()
+{
+    m_start_time = 0;
+    m_elapsed = 0;
+}
+
+void Timer::start()
+{
+    m_start_time = get_usec();
+}
+
+void Timer::stop()
+{
+    m_elapsed = get_usec() - m_start_time;
+}
+
+void Timer::print()
+{
+    printf("Elapsed: %ldus\n", m_elapsed);
+}

src/core/Timer.h

@@ -0,0 +1,19 @@
+#ifndef TIMER_H
+#define TIMER_H
+
+class Timer
+{
+public:
+    Timer();
+    void start();
+    void stop();
+    void print();
+
+    long get_elapsed() { return m_elapsed; }
+
+protected:
+    long m_start_time;
+    long m_elapsed;
+};
+
+#endif