Unittests: Add BlockingLoopTest

1 files changed, 51 insertions, 0 deletions

diff --git a/Source/UnitTests/Common/BusyLoopTest.cpp b/Source/UnitTests/Common/BusyLoopTest.cpp
new file mode 100644
index 0000000000..50d11acb31
--- /dev/null
+++ b/Source/UnitTests/Common/BusyLoopTest.cpp
@@ -0,0 +1,51 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <thread>
+
+#include <gtest/gtest.h>
+
+#include "Common/BlockingLoop.h"
+#include "Common/Thread.h"
+
+TEST(BusyLoopTest, MultiThreaded)
+{
+	Common::BlockingLoop loop;
+	Common::Event e;
+	for (int i = 0; i < 100; i++)
+	{
+		loop.Prepare();
+		std::thread loop_thread(
+		[&]() {
+			loop.Run(
+			[&]() {
+				e.Set();
+			});
+		});
+
+		// Ping - Pong
+		for (int j = 0; j < 10; j++)
+		{
+			loop.Wakeup();
+			e.Wait();
+
+			// Just waste some time. So the main loop did fall back to the sleep state much more likely.
+			Common::SleepCurrentThread(1);
+		}
+
+		for (int j = 0; j < 100; j++)
+		{
+			// We normally have to call Wakeup to assure the Event is triggered.
+			// But this check is for an internal feature of the BlockingLoop.
+			// It's implemented to fall back to a busy loop regulary.
+			// If we're in the busy loop, the payload (and so the Event) is called all the time.
+			//loop.Wakeup();
+			e.Wait();
+		}
+
+		loop.Stop();
+		loop_thread.join();
+	}
+}