again, re-add some windows stuff Revert "possibly controversial commit: remove all windows sources, keeping only the windows cmake so that we can generate an sln to edit the code"

This reverts commit 48ba7961eb.

engine/shared/library/sharedSynchronization/src/win32/Gate.cpp

@@ -0,0 +1,60 @@
+// ======================================================================
+//
+// Gate.cpp
+//
+// Copyright 2001-2002 Sony Online Entertainment
+// All Rights Reserved.
+//
+// ======================================================================
+
+#include "sharedSynchronization/FirstSharedSynchronization.h"
+#include "sharedSynchronization/Gate.h"
+
+// ======================================================================
+
+Gate::Gate(bool open)
+{
+	handle = CreateEvent(0, true, open, 0);
+	DEBUG_FATAL(handle == NULL, ("CreateEvent failed"));
+}
+
+// ----------------------------------------------------------------------
+
+Gate::~Gate()
+{
+	CloseHandle(handle);
+}
+
+// ----------------------------------------------------------------------
+
+void Gate::wait()
+{
+	int errors = 0;
+	for (;;)
+	{
+		DWORD result = WaitForSingleObject(handle, INFINITE);
+		if (result ==  WAIT_OBJECT_0)
+			return;
+
+		++errors;
+		FATAL(errors >= 3, ("WaitForSingleObject failed multiple times"));
+	}
+}
+
+// ----------------------------------------------------------------------
+
+void Gate::close()
+{
+	const BOOL result = ResetEvent(handle);
+	FATAL(result == 0, ("ResetEvent failed"));
+}
+
+// ----------------------------------------------------------------------
+
+void Gate::open()
+{
+	const BOOL result = SetEvent(handle);
+	FATAL(result == 0, ("SetEvent failed"));
+}
+
+// ======================================================================