209 lines
8.4 KiB
C
209 lines
8.4 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file chpipes.h
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* @brief Pipes macros and structures.
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*
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* @addtogroup oslib_pipes
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* @{
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*/
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#ifndef CHPIPES_H
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#define CHPIPES_H
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#if (CH_CFG_USE_PIPES == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Module constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Structure representing a pipe object.
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*/
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typedef struct {
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uint8_t *buffer; /**< @brief Pointer to the pipe
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buffer. */
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uint8_t *top; /**< @brief Pointer to the location
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after the buffer. */
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uint8_t *wrptr; /**< @brief Write pointer. */
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uint8_t *rdptr; /**< @brief Read pointer. */
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size_t cnt; /**< @brief Bytes in the pipe. */
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bool reset; /**< @brief True if in reset state. */
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thread_reference_t wtr; /**< @brief Waiting writer. */
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thread_reference_t rtr; /**< @brief Waiting reader. */
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#if (CH_CFG_USE_MUTEXES == TRUE) || defined(__DOXYGEN__)
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mutex_t cmtx; /**< @brief Common access mutex. */
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mutex_t wmtx; /**< @brief Write access mutex. */
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mutex_t rmtx; /**< @brief Read access mutex. */
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#else
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semaphore_t csem; /**< @brief Common access semaphore.*/
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semaphore_t wsem; /**< @brief Write access semaphore. */
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semaphore_t rsem; /**< @brief Read access semaphore. */
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#endif
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} pipe_t;
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/*===========================================================================*/
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/* Module macros. */
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/*===========================================================================*/
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/**
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* @brief Data part of a static pipe initializer.
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* @details This macro should be used when statically initializing a
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* pipe that is part of a bigger structure.
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*
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* @param[in] name the name of the pipe variable
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* @param[in] buffer pointer to the pipe buffer array of @p uint8_t
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* @param[in] size number of @p uint8_t elements in the buffer array
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*/
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#if (CH_CFG_USE_MUTEXES == TRUE) || defined(__DOXYGEN__)
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#define _PIPE_DATA(name, buffer, size) { \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer) + size, \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer), \
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(size_t)0, \
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false, \
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NULL, \
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NULL, \
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_MUTEX_DATA(name.cmtx), \
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_MUTEX_DATA(name.wmtx), \
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_MUTEX_DATA(name.rmtx), \
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}
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#else /* CH_CFG_USE_MUTEXES == FALSE */
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#define _PIPE_DATA(name, buffer, size) { \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer) + size, \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer), \
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(size_t)0, \
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false, \
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NULL, \
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NULL, \
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_SEMAPHORE_DATA(name.csem, (cnt_t)1), \
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_SEMAPHORE_DATA(name.wsem, (cnt_t)1), \
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_SEMAPHORE_DATA(name.rsem, (cnt_t)1), \
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}
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#endif /* CH_CFG_USE_MUTEXES == FALSE */
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/**
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* @brief Static pipe initializer.
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* @details Statically initialized pipes require no explicit
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* initialization using @p chPipeObjectInit().
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*
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* @param[in] name the name of the pipe variable
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* @param[in] buffer pointer to the pipe buffer array of @p uint8_t
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* @param[in] size number of @p uint8_t elements in the buffer array
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*/
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#define PIPE_DECL(name, buffer, size) \
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pipe_t name = _PIPE_DATA(name, buffer, size)
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void chPipeObjectInit(pipe_t *pp, uint8_t *buf, size_t n);
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void chPipeReset(pipe_t *pp);
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size_t chPipeWriteTimeout(pipe_t *pp, const uint8_t *bp,
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size_t n, sysinterval_t timeout);
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size_t chPipeReadTimeout(pipe_t *pp, uint8_t *bp,
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size_t n, sysinterval_t timeout);
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#ifdef __cplusplus
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}
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#endif
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/*===========================================================================*/
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/* Module inline functions. */
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/*===========================================================================*/
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/**
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* @brief Returns the pipe buffer size as number of bytes.
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*
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* @param[in] pp the pointer to an initialized @p pipe_t object
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* @return The size of the pipe.
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*
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* @api
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*/
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static inline size_t chPipeGetSize(const pipe_t *pp) {
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/*lint -save -e9033 [10.8] Perfectly safe pointers
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arithmetic.*/
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return (size_t)(pp->top - pp->buffer);
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/*lint -restore*/
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}
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/**
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* @brief Returns the number of used byte slots into a pipe.
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*
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* @param[in] pp the pointer to an initialized @p pipe_t object
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* @return The number of queued bytes.
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*
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* @api
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*/
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static inline size_t chPipeGetUsedCount(const pipe_t *pp) {
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return pp->cnt;
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}
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/**
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* @brief Returns the number of free byte slots into a pipe.
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*
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* @param[in] pp the pointer to an initialized @p pipe_t object
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* @return The number of empty byte slots.
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*
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* @api
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*/
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static inline size_t chPipeGetFreeCount(const pipe_t *pp) {
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return chPipeGetSize(pp) - chPipeGetUsedCount(pp);
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}
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/**
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* @brief Terminates the reset state.
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*
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* @param[in] pp the pointer to an initialized @p pipe_t object
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*
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* @api
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*/
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static inline void chPipeResume(pipe_t *pp) {
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pp->reset = false;
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}
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#endif /* CH_CFG_USE_PIPES == TRUE */
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#endif /* CHPIPES_H */
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/** @} */
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