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76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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* Copyright (C) 2015-2017 Simon Brummer
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup net_gnrc_tcp
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*
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* @{
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*
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* @file
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* @brief Functions for allocating and freeing the receive buffer.
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*
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* @author Simon Brummer <simon.brummer@posteo.de>
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*/
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#ifndef RCVBUF_H
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#define RCVBUF_H
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#include <stdint.h>
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#include "mutex.h"
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#include "net/gnrc/tcp/config.h"
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#include "net/gnrc/tcp/tcb.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Receive buffer entry.
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*/
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typedef struct rcvbuf_entry {
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uint8_t used; /**< Flag: Is buffer in use? */
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uint8_t buffer[GNRC_TCP_RCV_BUF_SIZE]; /**< Receive buffer storage */
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} rcvbuf_entry_t;
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/**
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* @brief Struct holding receive buffers.
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*/
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typedef struct rcvbuf {
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mutex_t lock; /**< Lock for allocation synchronization */
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rcvbuf_entry_t entries[GNRC_TCP_RCV_BUFFERS]; /**< Maintained receive buffers */
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} rcvbuf_t;
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/**
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* @brief Initializes global receive buffer.
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*/
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void _rcvbuf_init(void);
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/**
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* @brief Allocate receive buffer and assign it to TCB.
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*
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* @param[in,out] tcb TCB that acquires receive buffer.
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*
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* @returns Zero on success.
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* -ENOMEM if all receive buffers are currently used.
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*/
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int _rcvbuf_get_buffer(gnrc_tcp_tcb_t *tcb);
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/**
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* @brief Release allocated receive buffer.
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*
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* @param[in,out] tcb TCB holding the receive buffer that should be released.
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*/
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void _rcvbuf_release_buffer(gnrc_tcp_tcb_t *tcb);
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#ifdef __cplusplus
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}
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#endif
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#endif /* RCVBUF_H */
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/** @} */
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