[Common] Add high res time stamp

Source/Common/HighResTimeStamp.cpp

@@ -0,0 +1,58 @@
+#include "stdafx.h"
+#include "HighResTimeStamp.h"
+#ifndef _WIN32
+#include <math.h>
+#endif
+
+#ifdef _WIN32
+bool HighResTimeStamp::m_GotFreq = false;
+uint64_t HighResTimeStamp::m_Freq = { 0 };
+#endif
+
+HighResTimeStamp::HighResTimeStamp()
+{
+#ifndef _WIN32
+    m_time = 0;
+#else
+    if (!m_GotFreq)
+    {
+        LARGE_INTEGER value;
+        QueryPerformanceFrequency(&value);
+        m_Freq = value.QuadPart;
+    }
+    m_time = 0;
+#endif
+}
+
+HighResTimeStamp & HighResTimeStamp::SetToNow(void)
+{
+#ifndef _WIN32
+    struct timespec now;
+    memset(&now, 0, sizeof(now));
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    m_time = ((uint64_t)now.tv_sec * (uint64_t)1000000l) + (now.tv_nsec / 1000);
+#else
+    LARGE_INTEGER value;
+    QueryPerformanceCounter(&value);
+    m_time = value.QuadPart;
+#endif
+    return *this;
+}
+
+uint64_t HighResTimeStamp::GetMicroSeconds(void)
+{
+#ifndef _WIN32
+    return m_time;
+#else
+    return (m_time * 1000000) / m_Freq;
+#endif
+}
+
+void HighResTimeStamp::SetMicroSeconds(uint64_t MicroSeconds)
+{
+#ifndef _WIN32
+    m_time = MicroSeconds;
+#else
+    m_time = (MicroSeconds * m_Freq) / 1000000;
+#endif
+}

Source/Common/HighResTimeStamp.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "stdtypes.h"
+
+class HighResTimeStamp
+{
+public:
+    HighResTimeStamp();
+    HighResTimeStamp & SetToNow (void);
+    uint64_t GetMicroSeconds(void);
+    void SetMicroSeconds(uint64_t MicroSeconds);
+
+private:
+#ifdef _WIN32
+    static bool m_GotFreq;
+    static uint64_t m_Freq;
+#endif
+    uint64_t m_time;
+};