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+/*
+ * File     : lfq.h
+ * Author   : Jérémy Zurcher  <jeremy@asynk.ch>
+ * Date     : 02/11/09 
+ * License  :
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining
+ *  a copy of this software and associated documentation files (the
+ *  "Software"), to deal in the Software without restriction, including
+ *  without limitation the rights to use, copy, modify, merge, publish,
+ *  distribute, sublicense, and/or sell copies of the Software, and to
+ *  permit persons to whom the Software is furnished to do so, subject to
+ *  the following conditions:
+ *  
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+
+#ifndef _LFQ_H_
+#define _LFQ_H_
+
+# ifdef __cplusplus
+extern "C" {
+# endif /* __cplusplus */
+
+typedef union pointer {
+    struct split {
+        volatile union pointer *next;
+        volatile unsigned int count;
+    } split;
+    volatile unsigned long long concat;
+} pointer_t;
+
+typedef struct queue {
+    pointer_t head;
+    pointer_t tail;
+} lfq_t;
+
+/* initialize an empty lfq structure */
+void lfq_init( lfq_t *q );
+
+/* push a node at the tail of q */
+void lfq_push( lfq_t *q, pointer_t *node );
+
+/* shift a node from the head of q */
+pointer_t* shift( lfq_t *q );
+
+# ifdef __cplusplus
+}
+# endif /* __cplusplus */
+
+# endif /* _LFQ_H_ */
+