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/*
* Copyright (C) 2015-2017 Simon Brummer
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup net_gnrc_tcp TCP
* @ingroup net_gnrc
* @brief RIOT's tcp implementation for the gnrc stack
*
* @{
*
* @file
* @brief Functions for allocating and freeing the receive buffer
*
* @author Simon Brummer <simon.brummer@posteo.de>
* @}
*/
#ifndef GNRC_TCP_INTERNAL_RCVBUF_H
#define GNRC_TCP_INTERNAL_RCVBUF_H
#include <stdint.h>
#include "mutex.h"
#include "ringbuffer.h"
#include "net/gnrc/tcp/config.h"
#include "net/gnrc/tcp/tcb.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Struct for a single connections receive buffer
* @internal
*/
typedef struct rcvbuf_entry {
uint8_t used; /**< Is entry currently in use */
uint8_t buffer[GNRC_TCP_RCV_BUF_SIZE]; /**< Raw Buffer Data */
} rcvbuf_entry_t;
/**
* @brief Stuct holding receive buffers
* @internal
*/
typedef struct rcvbuf {
mutex_t lock; /**< Lock for synchronization */
rcvbuf_entry_t entries[GNRC_TCP_RCV_BUFFERS]; /**< Number of receive buffers */
} rcvbuf_t;
/**
* @brief Initializes global receive Buffer
* @internal
*/
void _rcvbuf_init(void);
/**
* @brief Initializes and assigns receive Buffer to tcb.
*
* @param[in] tcb Transmission control block that should hold the buffer.
*
* @return zero on success
* @return -ENOMEM If receive buffer is out of memory.
*/
int _rcvbuf_get_buffer(gnrc_tcp_tcb_t *tcb);
/**
* @brief Free allocated receive buffer
*
* @param[in] tcb Transmission control block that buffer should be freed.
*/
void _rcvbuf_release_buffer(gnrc_tcp_tcb_t *tcb);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_TCP_INTERNAL_RCVBUF_H */
/** @} */