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/*! \file write_queue.h
* Generic write queue implementation */
/*
* (C) 2010 by Holger Hans Peter Freyther
* (C) 2010 by On-Waves
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#pragma once
/*! \defgroup write_queue Osmocom msgb write queues
* @{
* \file write_queue.h */
#include <osmocom/core/select.h>
#include <osmocom/core/msgb.h>
/*! write queue instance */
struct osmo_wqueue {
/*! osmocom file descriptor */
struct osmo_fd bfd;
/*! maximum length of write queue */
unsigned int max_length;
/*! current length of write queue */
unsigned int current_length;
/*! actual linked list implementing the queue */
struct llist_head msg_queue;
/*! call-back in case qeueue is readable. Return -EBADF if fd is freed inside cb. */
int (*read_cb)(struct osmo_fd *fd);
/*! call-back in case qeueue is writable. Return -EBADF if fd is freed inside cb. */
int (*write_cb)(struct osmo_fd *fd, struct msgb *msg);
/*! call-back in case qeueue has exceptions. Return -EBADF if fd is freed inside cb. */
int (*except_cb)(struct osmo_fd *fd);
};
void osmo_wqueue_init(struct osmo_wqueue *queue, int max_length);
void osmo_wqueue_clear(struct osmo_wqueue *queue);
int osmo_wqueue_enqueue(struct osmo_wqueue *queue, struct msgb *data);
int osmo_wqueue_enqueue_quiet(struct osmo_wqueue *queue, struct msgb *data);
size_t osmo_wqueue_set_maxlen(struct osmo_wqueue *queue, unsigned int len);
int osmo_wqueue_bfd_cb(struct osmo_fd *fd, unsigned int what);
/*! @} */
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