Initial community commit

Src/replicant/nu/LockFreeFIFO.h

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+#pragma once
+#include "queue_node.h"
+/* Algorithm taken from
+Lock-Free Techniques for Concurrent Access to Shared Objects
+Dominique Fober, Yann Orlarey, Stephane Letz
+http://www.grame.fr/Ressources/pub/LockFree.pdf
+http://nedko.arnaudov.name/soft/L17_Fober.pdf
+http://www.grame.fr/Ressources/pub/TR-050523.pdf
+This implementation (c) 2010 Nullsoft, Inc.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+	
+struct FIFO_POINTER
+{
+	queue_node_t *fifo_node_t;
+	size_t count;
+};
+
+struct fifo_t
+{
+	FIFO_POINTER head; // _head pointer and total count of pop operations (ocount)
+	FIFO_POINTER tail; // _tail pointer and total count of push operations (icount)
+	queue_node_t dummy;
+	size_t count;
+};
+void fifo_init(fifo_t *fifo);
+void fifo_push(fifo_t *fifo, queue_node_t *cl);
+queue_node_t *fifo_pop(fifo_t *fifo);
+#ifdef __cplusplus
+}
+#endif