Initial community commit

Src/replicant/nu/win/MessageLoop.h

@@ -0,0 +1,45 @@
+#pragma once
+#include "foundation/types.h"
+#include "nu/lfmpscq.h"
+#include "nu/LockFreeLIFO.h"
+#include <windows.h>
+
+namespace nu
+{
+
+	/* you can inherit from message_node_t (or combine inside a struct)
+	but make sure that your message isn't > 64 bytes */
+	struct message_node_t : public queue_node_t
+	{
+		uint32_t message;
+	};
+	
+	class MessageLoop
+	{
+	public:
+		MessageLoop();
+		~MessageLoop();
+		/* API for Message senders */
+		message_node_t *AllocateMessage(); // returns a message for you to fill out
+		void PostMessage(message_node_t *message);	
+
+		/* API for Message receivers */
+		void FreeMessage(message_node_t *message);
+		message_node_t *GetMessage(); // waits forever
+		message_node_t *PeekMessage();
+		message_node_t *PeekMessage(unsigned int milliseconds);
+	private:
+		void RefillCache();
+
+		HANDLE message_notification;
+		mpscq_t message_queue;
+
+		/* Memory cache to be able to run APCs without having the memory manager lock 
+		we'll allocate 100 at a time (#defined by MESSAGE_CACHE_SEED)
+		and allocate new ones only if the cache is empty (which unfortunately will lock)
+		cache_bases holds the pointers we've allocated (to free on destruction of this object)
+		and message_cache holds the individual pointers */
+		static lifo_t message_cache;
+		static lifo_t cache_bases;
+	};
+}