370 lines
13 KiB
C
370 lines
13 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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/RT 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 chqueues.h
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* @brief I/O Queues macros and structures.
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*
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* @addtogroup io_queues
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* @{
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*/
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#ifndef _CHQUEUES_H_
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#define _CHQUEUES_H_
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#if CH_USE_QUEUES || defined(__DOXYGEN__)
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/**
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* @name Queue functions returned status value
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* @{
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*/
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#define Q_OK RDY_OK /**< @brief Operation successful. */
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#define Q_TIMEOUT RDY_TIMEOUT /**< @brief Timeout condition. */
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#define Q_RESET RDY_RESET /**< @brief Queue has been reset. */
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#define Q_EMPTY -3 /**< @brief Queue empty. */
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#define Q_FULL -4 /**< @brief Queue full, */
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/** @} */
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/**
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* @brief Type of a generic I/O queue structure.
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*/
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typedef struct GenericQueue GenericQueue;
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/** @brief Queue notification callback type.*/
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typedef void (*qnotify_t)(GenericQueue *qp);
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/**
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* @brief Generic I/O queue structure.
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* @details This structure represents a generic Input or Output asymmetrical
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* queue. The queue is asymmetrical because one end is meant to be
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* accessed from a thread context, and thus can be blocking, the other
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* end is accessible from interrupt handlers or from within a kernel
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* lock zone (see <b>I-Locked</b> and <b>S-Locked</b> states in
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* @ref system_states) and is non-blocking.
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*/
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struct GenericQueue {
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ThreadsQueue q_waiting; /**< @brief Queue of waiting threads. */
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size_t q_counter; /**< @brief Resources counter. */
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uint8_t *q_buffer; /**< @brief Pointer to the queue buffer.*/
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uint8_t *q_top; /**< @brief Pointer to the first location
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after the buffer. */
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uint8_t *q_wrptr; /**< @brief Write pointer. */
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uint8_t *q_rdptr; /**< @brief Read pointer. */
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qnotify_t q_notify; /**< @brief Data notification callback. */
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void *q_link; /**< @brief Application defined field. */
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};
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Returns the queue's buffer size.
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*
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* @param[in] qp pointer to a @p GenericQueue structure.
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* @return The buffer size.
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*
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* @iclass
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*/
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#define chQSizeI(qp) ((size_t)((qp)->q_top - (qp)->q_buffer))
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/**
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* @brief Queue space.
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* @details Returns the used space if used on an input queue or the empty
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* space if used on an output queue.
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*
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* @param[in] qp pointer to a @p GenericQueue structure.
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* @return The buffer space.
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*
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* @iclass
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*/
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#define chQSpaceI(qp) ((qp)->q_counter)
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/**
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* @brief Returns the queue application-defined link.
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* @note This function can be called in any context.
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*
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* @param[in] qp pointer to a @p GenericQueue structure.
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* @return The application-defined link.
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*
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* @special
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*/
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#define chQGetLink(qp) ((qp)->q_link)
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/** @} */
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/**
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* @extends GenericQueue
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*
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* @brief Type of an input queue structure.
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* @details This structure represents a generic asymmetrical input queue.
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* Writing to the queue is non-blocking and can be performed from
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* interrupt handlers or from within a kernel lock zone (see
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* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
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* Reading the queue can be a blocking operation and is supposed to
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* be performed by a system thread.
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*/
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typedef GenericQueue InputQueue;
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Returns the filled space into an input queue.
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*
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* @param[in] iqp pointer to an @p InputQueue structure
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* @return The number of full bytes in the queue.
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* @retval 0 if the queue is empty.
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*
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* @iclass
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*/
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#define chIQGetFullI(iqp) chQSpaceI(iqp)
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/**
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* @brief Returns the empty space into an input queue.
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*
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* @param[in] iqp pointer to an @p InputQueue structure
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* @return The number of empty bytes in the queue.
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* @retval 0 if the queue is full.
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*
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* @iclass
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*/
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#define chIQGetEmptyI(iqp) (chQSizeI(iqp) - chQSpaceI(iqp))
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/**
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* @brief Evaluates to @p TRUE if the specified input queue is empty.
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*
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* @param[in] iqp pointer to an @p InputQueue structure.
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* @return The queue status.
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* @retval FALSE The queue is not empty.
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* @retval TRUE The queue is empty.
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*
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* @iclass
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*/
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#define chIQIsEmptyI(iqp) ((bool_t)(chQSpaceI(iqp) <= 0))
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/**
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* @brief Evaluates to @p TRUE if the specified input queue is full.
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*
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* @param[in] iqp pointer to an @p InputQueue structure.
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* @return The queue status.
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* @retval FALSE The queue is not full.
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* @retval TRUE The queue is full.
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*
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* @iclass
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*/
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#define chIQIsFullI(iqp) ((bool_t)(((iqp)->q_wrptr == (iqp)->q_rdptr) && \
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((iqp)->q_counter != 0)))
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/**
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* @brief Input queue read.
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* @details This function reads a byte value from an input queue. If the queue
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* is empty then the calling thread is suspended until a byte arrives
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* in the queue.
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*
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* @param[in] iqp pointer to an @p InputQueue structure
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* @return A byte value from the queue.
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* @retval Q_RESET if the queue has been reset.
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*
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* @api
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*/
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#define chIQGet(iqp) chIQGetTimeout(iqp, TIME_INFINITE)
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/** @} */
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/**
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* @brief Data part of a static input queue initializer.
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* @details This macro should be used when statically initializing an
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* input queue that is part of a bigger structure.
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*
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* @param[in] name the name of the input queue variable
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* @param[in] buffer pointer to the queue buffer area
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* @param[in] size size of the queue buffer area
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* @param[in] inotify input notification callback pointer
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* @param[in] link application defined pointer
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*/
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#define _INPUTQUEUE_DATA(name, buffer, size, inotify, link) { \
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_THREADSQUEUE_DATA(name), \
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0, \
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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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(inotify), \
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(link) \
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}
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/**
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* @brief Static input queue initializer.
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* @details Statically initialized input queues require no explicit
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* initialization using @p chIQInit().
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*
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* @param[in] name the name of the input queue variable
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* @param[in] buffer pointer to the queue buffer area
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* @param[in] size size of the queue buffer area
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* @param[in] inotify input notification callback pointer
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* @param[in] link application defined pointer
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*/
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#define INPUTQUEUE_DECL(name, buffer, size, inotify, link) \
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InputQueue name = _INPUTQUEUE_DATA(name, buffer, size, inotify, link)
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/**
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* @extends GenericQueue
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*
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* @brief Type of an output queue structure.
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* @details This structure represents a generic asymmetrical output queue.
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* Reading from the queue is non-blocking and can be performed from
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* interrupt handlers or from within a kernel lock zone (see
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* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
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* Writing the queue can be a blocking operation and is supposed to
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* be performed by a system thread.
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*/
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typedef GenericQueue OutputQueue;
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Returns the filled space into an output queue.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure
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* @return The number of full bytes in the queue.
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* @retval 0 if the queue is empty.
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*
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* @iclass
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*/
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#define chOQGetFullI(oqp) (chQSizeI(oqp) - chQSpaceI(oqp))
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/**
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* @brief Returns the empty space into an output queue.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure
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* @return The number of empty bytes in the queue.
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* @retval 0 if the queue is full.
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*
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* @iclass
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*/
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#define chOQGetEmptyI(oqp) chQSpaceI(oqp)
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/**
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* @brief Evaluates to @p TRUE if the specified output queue is empty.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure.
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* @return The queue status.
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* @retval FALSE The queue is not empty.
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* @retval TRUE The queue is empty.
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*
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* @iclass
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*/
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#define chOQIsEmptyI(oqp) ((bool_t)(((oqp)->q_wrptr == (oqp)->q_rdptr) && \
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((oqp)->q_counter != 0)))
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/**
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* @brief Evaluates to @p TRUE if the specified output queue is full.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure.
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* @return The queue status.
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* @retval FALSE The queue is not full.
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* @retval TRUE The queue is full.
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*
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* @iclass
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*/
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#define chOQIsFullI(oqp) ((bool_t)(chQSpaceI(oqp) <= 0))
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/**
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* @brief Output queue write.
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* @details This function writes a byte value to an output queue. If the queue
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* is full then the calling thread is suspended until there is space
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* in the queue.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure
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* @param[in] b the byte value to be written in the queue
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* @return The operation status.
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* @retval Q_OK if the operation succeeded.
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* @retval Q_RESET if the queue has been reset.
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*
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* @api
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*/
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#define chOQPut(oqp, b) chOQPutTimeout(oqp, b, TIME_INFINITE)
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/** @} */
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/**
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* @brief Data part of a static output queue initializer.
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* @details This macro should be used when statically initializing an
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* output queue that is part of a bigger structure.
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*
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* @param[in] name the name of the output queue variable
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* @param[in] buffer pointer to the queue buffer area
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* @param[in] size size of the queue buffer area
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* @param[in] onotify output notification callback pointer
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* @param[in] link application defined pointer
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*/
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#define _OUTPUTQUEUE_DATA(name, buffer, size, onotify, link) { \
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_THREADSQUEUE_DATA(name), \
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(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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(onotify), \
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(link) \
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}
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/**
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* @brief Static output queue initializer.
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* @details Statically initialized output queues require no explicit
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* initialization using @p chOQInit().
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*
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* @param[in] name the name of the output queue variable
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* @param[in] buffer pointer to the queue buffer area
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* @param[in] size size of the queue buffer area
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* @param[in] onotify output notification callback pointer
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* @param[in] link application defined pointer
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*/
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#define OUTPUTQUEUE_DECL(name, buffer, size, onotify, link) \
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OutputQueue name = _OUTPUTQUEUE_DATA(name, buffer, size, onotify, link)
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#ifdef __cplusplus
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extern "C" {
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#endif
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void chIQInit(InputQueue *iqp, uint8_t *bp, size_t size, qnotify_t infy,
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void *link);
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void chIQResetI(InputQueue *iqp);
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msg_t chIQPutI(InputQueue *iqp, uint8_t b);
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msg_t chIQGetTimeout(InputQueue *iqp, systime_t time);
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size_t chIQReadTimeout(InputQueue *iqp, uint8_t *bp,
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size_t n, systime_t time);
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void chOQInit(OutputQueue *oqp, uint8_t *bp, size_t size, qnotify_t onfy,
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void *link);
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void chOQResetI(OutputQueue *oqp);
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msg_t chOQPutTimeout(OutputQueue *oqp, uint8_t b, systime_t time);
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msg_t chOQGetI(OutputQueue *oqp);
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size_t chOQWriteTimeout(OutputQueue *oqp, const uint8_t *bp,
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size_t n, systime_t time);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CH_USE_QUEUES */
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#endif /* _CHQUEUES_H_ */
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/** @} */
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