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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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 3 of the License, or
(at your option) any later version.
ChibiOS 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chfifo.h
* @brief Objects FIFO structures and macros.
* @details This module implements a generic FIFO queue of objects by
* coupling a Guarded Memory Pool (for objects storage) and
* a MailBox.<br>
* On the sender side free objects are taken from the pool, filled
* and then sent to the receiver, on the receiver side objects are
* fetched, used and then returned to the pool.
* Operations defined for object FIFOs:
* - <b>Take</b>: An object is taken from the pool of the free
* objects, can be blocking.
* - <b>Return</b>: An object is returned to the pool of the
* free objects, it is guaranteed to be non-blocking.
* - <b>Send</b>: An object is sent through the mailbox, it is
* guaranteed to be non-blocking
* - <b>Receive</b>: An object is received from the mailbox,
* can be blocking.
* .
*
* @addtogroup objects_fifo
* @{
*/
#ifndef CHFIFO_H
#define CHFIFO_H
#if !defined(CH_CFG_USE_OBJ_FIFOS)
#define CH_CFG_USE_OBJ_FIFOS TRUE
#endif
#if (CH_CFG_USE_OBJ_FIFOS == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if CH_CFG_USE_MEMPOOLS == FALSE
#error "CH_CFG_USE_FIFO requires CH_CFG_USE_MEMPOOLS"
#endif
#if CH_CFG_USE_SEMAPHORES == FALSE
#error "CH_CFG_USE_FIFO requires CH_CFG_USE_SEMAPHORES"
#endif
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/**
* @brief Type of an objects FIFO.
*/
typedef struct ch_objects_fifo {
/**
* @brief Pool of the free objects.
*/
guarded_memory_pool_t free;
/**
* @brief Mailbox of the sent objects.
*/
mailbox_t mbx;
} objects_fifo_t;
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Initializes a FIFO object.
*
* @param[out] ofp pointer to a @p objects_fifo_t structure
* @param[in] objsize size of objects
* @param[in] objn number of objects available
* @param[in] objbuf pointer to the buffer of objects, it must be able
* to hold @p objn objects of @p objsize size
* @param[in] msgbuf pointer to the buffer of messages, it must be able
* to hold @p objn messages
*
* @init
*/
static inline void chFifoObjectInit(objects_fifo_t *ofp, size_t objsize,
size_t objn, void *objbuf,
msg_t *msgbuf) {
chGuardedPoolObjectInit(&ofp->free, objsize);
chGuardedPoolLoadArray(&ofp->free, objbuf, objn);
chMBObjectInit(&ofp->mbx, msgbuf, objn);
}
/**
* @brief Allocates a free object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @return The pointer to the allocated object.
* @retval NULL if an object is not immediately available.
*
* @iclass
*/
static inline void *chFifoTakeObjectI(objects_fifo_t *ofp) {
return chGuardedPoolAllocI(&ofp->free);
}
/**
* @brief Allocates a free object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The pointer to the allocated object.
* @retval NULL if an object is not available within the specified
* timeout.
*
* @sclass
*/
static inline void *chFifoTakeObjectTimeoutS(objects_fifo_t *ofp,
systime_t timeout) {
return chGuardedPoolAllocTimeoutS(&ofp->free, timeout);
}
/**
* @brief Allocates a free object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The pointer to the allocated object.
* @retval NULL if an object is not available within the specified
* timeout.
*
* @api
*/
static inline void *chFifoTakeObjectTimeout(objects_fifo_t *ofp,
systime_t timeout) {
return chGuardedPoolAllocTimeout(&ofp->free, timeout);
}
/**
* @brief Releases a fetched object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objp pointer to the object to be released
*
* @iclass
*/
static inline void chFifoReturnObjectI(objects_fifo_t *ofp,
void *objp) {
chGuardedPoolFreeI(&ofp->free, objp);
}
/**
* @brief Releases a fetched object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objp pointer to the object to be released
*
* @api
*/
static inline void chFifoReturnObject(objects_fifo_t *ofp,
void *objp) {
chGuardedPoolFree(&ofp->free, objp);
}
/**
* @brief Posts an object.
* @note By design the object can be always immediately posted.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objp pointer to the object to be released
*
* @iclass
*/
static inline void chFifoSendObjectI(objects_fifo_t *ofp,
void *objp) {
msg_t msg;
msg = chMBPostI(&ofp->mbx, (msg_t)objp);
chDbgAssert(msg == MSG_OK, "post failed");
}
/**
* @brief Posts an object.
* @note By design the object can be always immediately posted.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objp pointer to the object to be released
*
* @sclass
*/
static inline void chFifoSendObjectS(objects_fifo_t *ofp,
void *objp) {
msg_t msg;
msg = chMBPostTimeoutS(&ofp->mbx, (msg_t)objp, TIME_IMMEDIATE);
chDbgAssert(msg == MSG_OK, "post failed");
}
/**
* @brief Posts an object.
* @note By design the object can be always immediately posted.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objp pointer to the object to be released
*
* @api
*/
static inline void chFifoSendObject(objects_fifo_t *ofp, void *objp) {
msg_t msg;
msg = chMBPostTimeout(&ofp->mbx, (msg_t)objp, TIME_IMMEDIATE);
chDbgAssert(msg == MSG_OK, "post failed");
}
/**
* @brief Fetches an object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objpp pointer to the fetched object reference
* @return The operation status.
* @retval MSG_OK if an object has been correctly fetched.
* @retval MSG_TIMEOUT if the FIFO is empty and a message cannot be fetched.
*
* @iclass
*/
static inline msg_t chFifoReceiveObjectI(objects_fifo_t *ofp,
void **objpp) {
return chMBFetchI(&ofp->mbx, (msg_t *)objpp);
}
/**
* @brief Fetches an object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objpp pointer to the fetched object reference
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The operation status.
* @retval MSG_OK if an object has been correctly fetched.
* @retval MSG_TIMEOUT if the operation has timed out.
*
* @sclass
*/
static inline msg_t chFifoReceiveObjectTimeoutS(objects_fifo_t *ofp,
void **objpp,
systime_t timeout) {
return chMBFetchTimeoutS(&ofp->mbx, (msg_t *)objpp, timeout);
}
/**
* @brief Fetches an object.
*
* @param[in] ofp pointer to a @p objects_fifo_t structure
* @param[in] objpp pointer to the fetched object reference
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The operation status.
* @retval MSG_OK if an object has been correctly fetched.
* @retval MSG_TIMEOUT if the operation has timed out.
*
* @api
*/
static inline msg_t chFifoReceiveObjectTimeout(objects_fifo_t *ofp,
void **objpp,
systime_t timeout) {
return chMBFetchTimeout(&ofp->mbx, (msg_t *)objpp, timeout);
}
#endif /* CH_CFG_USE_OBJ_FIFOS == TRUE */
#endif /* CHFIFO_H */
/** @} */
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