/*
ChibiOS - Copyright (C) 2006..2018 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 chmempools.h
* @brief Memory Pools macros and structures.
*
* @addtogroup oslib_mempools
* @{
*/
#ifndef CHMEMPOOLS_H
#define CHMEMPOOLS_H
#if (CH_CFG_USE_MEMPOOLS == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if CH_CFG_USE_MEMCORE == FALSE
#error "CH_CFG_USE_MEMPOOLS requires CH_CFG_USE_MEMCORE"
#endif
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/**
* @brief Memory pool free object header.
*/
struct pool_header {
struct pool_header *next; /**< @brief Pointer to the next pool
header in the list. */
};
/**
* @brief Memory pool descriptor.
*/
typedef struct {
struct pool_header *next; /**< @brief Pointer to the header. */
size_t object_size; /**< @brief Memory pool objects
size. */
unsigned align; /**< @brief Required alignment. */
memgetfunc_t provider; /**< @brief Memory blocks provider
for this pool. */
} memory_pool_t;
#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__)
/**
* @brief Guarded memory pool descriptor.
*/
typedef struct {
semaphore_t sem; /**< @brief Counter semaphore guarding
the memory pool. */
memory_pool_t pool; /**< @brief The memory pool itself. */
} guarded_memory_pool_t;
#endif /* CH_CFG_USE_SEMAPHORES == TRUE */
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @brief Data part of a static memory pool initializer.
* @details This macro should be used when statically initializing a
* memory pool that is part of a bigger structure.
*
* @param[in] name the name of the memory pool variable
* @param[in] size size of the memory pool contained objects
* @param[in] align required memory alignment
* @param[in] provider memory provider function for the memory pool
*/
#define _MEMORYPOOL_DATA(name, size, align, provider) \
{NULL, size, align, provider}
/**
* @brief Static memory pool initializer.
* @details Statically initialized memory pools require no explicit
* initialization using @p chPoolInit().
*
* @param[in] name the name of the memory pool variable
* @param[in] size size of the memory pool contained objects
* @param[in] align required memory alignment
* @param[in] provider memory provider function for the memory pool or @p NULL
* if the pool is not allowed to grow automatically
*/
#define MEMORYPOOL_DECL(name, size, align, provider) \
memory_pool_t name = _MEMORYPOOL_DATA(name, size, align, provider)
#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__)
/**
* @brief Data part of a static guarded memory pool initializer.
* @details This macro should be used when statically initializing a
* memory pool that is part of a bigger structure.
*
* @param[in] name the name of the memory pool variable
* @param[in] size size of the memory pool contained objects
* @param[in] align required memory alignment
*/
#define _GUARDEDMEMORYPOOL_DATA(name, size, align) { \
_SEMAPHORE_DATA(name.sem, (cnt_t)0), \
_MEMORYPOOL_DATA(NULL, size, align, NULL) \
}
/**
* @brief Static guarded memory pool initializer.
* @details Statically initialized guarded memory pools require no explicit
* initialization using @p chGuardedPoolInit().
*
* @param[in] name the name of the guarded memory pool variable
* @param[in] size size of the memory pool contained objects
* @param[in] align required memory alignment
*/
#define GUARDEDMEMORYPOOL_DECL(name, size, align) \
guarded_memory_pool_t name = _GUARDEDMEMORYPOOL_DATA(name, size, align)
#endif /* CH_CFG_USE_SEMAPHORES == TRUE */
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void chPoolObjectInitAligned(memory_pool_t *mp, size_t size,
unsigned align, memgetfunc_t provider);
void chPoolLoadArray(memory_pool_t *mp, void *p, size_t n);
void *chPoolAllocI(memory_pool_t *mp);
void *chPoolAlloc(memory_pool_t *mp);
void chPoolFreeI(memory_pool_t *mp, void *objp);
void chPoolFree(memory_pool_t *mp, void *objp);
#if CH_CFG_USE_SEMAPHORES == TRUE
void chGuardedPoolObjectInitAligned(guarded_memory_pool_t *gmp,
size_t size,
unsigned align);
void chGuardedPoolLoadArray(guarded_memory_pool_t *gmp, void *p, size_t n);
void *chGuardedPoolAllocTimeoutS(guarded_memory_pool_t *gmp,
sysinterval_t timeout);
void *chGuardedPoolAllocTimeout(guarded_memory_pool_t *gmp,
sysinterval_t timeout);
void chGuardedPoolFree(guarded_memory_pool_t *gmp, void *objp);
#endif
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Initializes an empty memory pool.
*
* @param[out] mp pointer to a @p memory_pool_t structure
* @param[in] size the size of the objects contained in this memory pool,
* the minimum accepted size is the size of a pointer to
* void.
* @param[in] provider memory provider function for the memory pool or
* @p NULL if the pool is not allowed to grow
* automatically
*
* @init
*/
static inline void chPoolObjectInit(memory_pool_t *mp,
size_t size,
memgetfunc_t provider) {
chPoolObjectInitAligned(mp, size, PORT_NATURAL_ALIGN, provider);
}
/**
* @brief Adds an object to a memory pool.
* @pre The memory pool must be already been initialized.
* @pre The added object must be of the right size for the specified
* memory pool.
* @pre The added object must be properly aligned.
* @note This function is just an alias for @p chPoolFree() and has been
* added for clarity.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @param[in] objp the pointer to the object to be added
*
* @api
*/
static inline void chPoolAdd(memory_pool_t *mp, void *objp) {
chPoolFree(mp, objp);
}
/**
* @brief Adds an object to a memory pool.
* @pre The memory pool must be already been initialized.
* @pre The added object must be of the right size for the specified
* memory pool.
* @pre The added object must be properly aligned.
* @note This function is just an alias for @p chPoolFreeI() and has been
* added for clarity.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @param[in] objp the pointer to the object to be added
*
* @iclass
*/
static inline void chPoolAddI(memory_pool_t *mp, void *objp) {
chPoolFreeI(mp, objp);
}
#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__)
/**
* @brief Initializes an empty guarded memory pool.
*
* @param[out] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] size the size of the objects contained in this guarded
* memory pool, the minimum accepted size is the size
* of a pointer to void.
*
* @init
*/
static inline void chGuardedPoolObjectInit(guarded_memory_pool_t *gmp,
size_t size) {
chGuardedPoolObjectInitAligned(gmp, size, PORT_NATURAL_ALIGN);
}
/**
* @brief Gets the count of objects in a guarded memory pool.
* @pre The guarded memory pool must be already been initialized.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @return The number of objects.
*
* @iclass
*/
static inline cnt_t chGuardedPoolGetCounterI(guarded_memory_pool_t *gmp) {
return chSemGetCounterI(&gmp->sem);
}
/**
* @brief Allocates an object from a guarded memory pool.
* @pre The guarded memory pool must be already been initialized.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @return The pointer to the allocated object.
* @retval NULL if the pool is empty.
*
* @iclass
*/
static inline void *chGuardedPoolAllocI(guarded_memory_pool_t *gmp) {
void *p;
p = chPoolAllocI(&gmp->pool);
if (p != NULL) {
chSemFastWaitI(&gmp->sem);
chDbgAssert(chSemGetCounterI(&gmp->sem) >= (cnt_t)0,
"semaphore out of sync");
}
return p;
}
/**
* @brief Releases an object into a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @iclass
*/
static inline void chGuardedPoolFreeI(guarded_memory_pool_t *gmp, void *objp) {
chPoolFreeI(&gmp->pool, objp);
chSemSignalI(&gmp->sem);
}
/**
* @brief Releases an object into a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @sclass
*/
static inline void chGuardedPoolFreeS(guarded_memory_pool_t *gmp, void *objp) {
chGuardedPoolFreeI(gmp, objp);
chSchRescheduleS();
}
/**
* @brief Adds an object to a guarded memory pool.
* @pre The guarded memory pool must be already been initialized.
* @pre The added object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
* @note This function is just an alias for @p chGuardedPoolFree() and
* has been added for clarity.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be added
*
* @api
*/
static inline void chGuardedPoolAdd(guarded_memory_pool_t *gmp, void *objp) {
chGuardedPoolFree(gmp, objp);
}
/**
* @brief Adds an object to a guarded memory pool.
* @pre The guarded memory pool must be already been initialized.
* @pre The added object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
* @note This function is just an alias for @p chGuardedPoolFreeI() and
* has been added for clarity.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be added
*
* @iclass
*/
static inline void chGuardedPoolAddI(guarded_memory_pool_t *gmp, void *objp) {
chGuardedPoolFreeI(gmp, objp);
}
/**
* @brief Adds an object to a guarded memory pool.
* @pre The guarded memory pool must be already been initialized.
* @pre The added object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
* @note This function is just an alias for @p chGuardedPoolFreeI() and
* has been added for clarity.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be added
*
* @sclass
*/
static inline void chGuardedPoolAddS(guarded_memory_pool_t *gmp, void *objp) {
chGuardedPoolFreeS(gmp, objp);
}
#endif /* CH_CFG_USE_SEMAPHORES == TRUE */
#endif /* CH_CFG_USE_MEMPOOLS == TRUE */
#endif /* CHMEMPOOLS_H */
/** @} */