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/usr/include/re/re_mqueue.h is in libre-dev 0.5.6-1ubuntu2.

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/**
 * @file re_mqueue.h Thread Safe Message Queue
 *
 * Copyright (C) 2010 Creytiv.com
 */

struct mqueue;

typedef void (mqueue_h)(int id, void *data, void *arg);

int mqueue_alloc(struct mqueue **mqp, mqueue_h *h, void *arg);
int mqueue_push(struct mqueue *mq, int id, void *data);