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/Semaphore.cpp

@@ -0,0 +1,37 @@
+// ======================================================================
+//
+// Semaphore.cpp
+// Acy Stapp
+//
+// Copyright 6/19/2001 Sony Online Entertainment
+//
+// ======================================================================
+
+#include "sharedSynchronization/FirstSharedSynchronization.h"
+#include "sharedSynchronization/Semaphore.h"
+
+Semaphore::Semaphore(int count, int initial)
+{
+	handle = CreateSemaphore(0, initial, count, 0);
+}
+
+Semaphore::~Semaphore()
+{
+	CloseHandle(handle);
+}
+
+void Semaphore::wait()
+{
+	WaitForSingleObject(handle, INFINITE);
+}
+
+void Semaphore::wait(unsigned int maxDurationMs)
+{
+	WaitForSingleObject(handle, maxDurationMs);
+}
+
+void Semaphore::signal(int count)
+{
+	ReleaseSemaphore(handle, count, 0);
+}
+