Some refactoring.

queue.h

@@ -0,0 +1,14 @@
+#ifndef QUEUE_H_SENTRY
+#define QUEUE_H_SENTRY
+
+#include "types.h"
+
+void qinit(queue *item);
+
+void qput(queue *item, particle data);
+
+void qget(queue *item, particle *data);
+
+int qempty(queue *item);
+
+#endif