1 files changed, 67 insertions, 0 deletions
diff --git a/zencore/timer.cpp b/zencore/timer.cpp
new file mode 100644
index 000000000..ee8e1cf9c
--- /dev/null
+++ b/zencore/timer.cpp
@@ -0,0 +1,67 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <doctest/doctest.h>
+#include <zencore/thread.h>
+#include <zencore/timer.h>
+#include <zencore/windows.h>
+
+namespace zen {
+
+uint64_t
+GetHifreqTimerValue()
+{
+	LARGE_INTEGER li;
+	QueryPerformanceCounter(&li);
+
+	return li.QuadPart;
+}
+
+uint64_t
+internalGetHifreqTimerFrequency()
+{
+	LARGE_INTEGER li;
+	QueryPerformanceFrequency(&li);
+
+	return li.QuadPart;
+}
+
+static uint64_t qpcFreq = internalGetHifreqTimerFrequency();
+
+uint64_t
+GetHifreqTimerFrequency()
+{
+	return qpcFreq;
+}
+
+uint64_t
+GetHifreqTimerFrequencySafe()
+{
+	if (!qpcFreq)
+		qpcFreq = internalGetHifreqTimerFrequency();
+
+	return qpcFreq;
+}
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Testing related code follows...
+//
+
+void
+timer_forcelink()
+{
+}
+
+TEST_CASE("Timer")
+{
+	uint64_t s0 = GetHifreqTimerValue();
+	uint64_t t0 = GetCpuTimerValue();
+	Sleep(1000);
+	uint64_t s1 = GetHifreqTimerValue();
+	uint64_t t1 = GetCpuTimerValue();
+	// double r = double(t1 - t0) / (s1 - s0);
+	CHECK_NE(t0, t1);
+	CHECK_NE(s0, s1);
+}
+
+}  // namespace zen