Common: Port Event class from YBaseLib over

src/common/event.h

@@ -0,0 +1,30 @@
+#pragma once
+#include "types.h"
+
+namespace Common {
+
+class Event
+{
+public:
+  Event(bool auto_reset = false);
+  ~Event();
+
+  void Reset();
+  void Signal();
+  void Wait();
+  bool TryWait(u32 timeout_in_ms);
+
+  static void WaitForMultipleEvents(Event** events, u32 num_events);
+
+private:
+#ifdef WIN32
+  void* m_event_handle;
+#elif defined(__linux__) || defined(__APPLE__)
+  int m_pipe_fds[2];
+  bool m_auto_reset;
+#else
+#error Unknown platform.
+#endif
+};
+
+} // namespace Common