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/*
ChibiOS - Copyright (C) 2006..2015 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 chdynamic.c
* @brief Dynamic threads code.
*
* @addtogroup dynamic_threads
* @details Dynamic threads related APIs and services.
* @{
*/
#include "ch.h"
#if (CH_CFG_USE_DYNAMIC == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief Adds a reference to a thread object.
* @pre The configuration option @p CH_CFG_USE_DYNAMIC must be enabled in
* order to use this function.
*
* @param[in] tp pointer to the thread
* @return The same thread pointer passed as parameter
* representing the new reference.
*
* @api
*/
thread_t *chThdAddRef(thread_t *tp) {
chSysLock();
chDbgAssert(tp->refs < (trefs_t)255, "too many references");
tp->refs++;
chSysUnlock();
return tp;
}
/**
* @brief Releases a reference to a thread object.
* @details If the references counter reaches zero <b>and</b> the thread
* is in the @p CH_STATE_FINAL state then the thread's memory is
* returned to the proper allocator.
* @pre The configuration option @p CH_CFG_USE_DYNAMIC must be enabled in
* order to use this function.
* @note Static threads are not affected.
*
* @param[in] tp pointer to the thread
*
* @api
*/
void chThdRelease(thread_t *tp) {
trefs_t refs;
chSysLock();
chDbgAssert(tp->refs > (trefs_t)0, "not referenced");
tp->refs--;
refs = tp->refs;
chSysUnlock();
/* If the references counter reaches zero and the thread is in its
terminated state then the memory can be returned to the proper
allocator. Of course static threads are not affected.*/
if ((refs == (trefs_t)0) && (tp->state == CH_STATE_FINAL)) {
switch (tp->flags & CH_FLAG_MODE_MASK) {
#if CH_CFG_USE_HEAP == TRUE
case CH_FLAG_MODE_HEAP:
#if CH_CFG_USE_REGISTRY == TRUE
REG_REMOVE(tp);
#endif
chHeapFree(chthdGetStackLimitX(tp));
break;
#endif
#if CH_CFG_USE_MEMPOOLS == TRUE
case CH_FLAG_MODE_MPOOL:
#if CH_CFG_USE_REGISTRY == TRUE
REG_REMOVE(tp);
#endif
chPoolFree(tp->mpool, chthdGetStackLimitX(tp));
break;
#endif
default:
/* Nothing to do for static threads, those are removed from the
registry on exit.*/
break;
}
}
}
#if (CH_CFG_USE_HEAP == TRUE) || defined(__DOXYGEN__)
/**
* @brief Creates a new thread allocating the memory from the heap.
* @pre The configuration options @p CH_CFG_USE_DYNAMIC and
* @p CH_CFG_USE_HEAP must be enabled in order to use this function.
* @note A thread can terminate by calling @p chThdExit() or by simply
* returning from its main function.
* @note The memory allocated for the thread is not released automatically,
* it is responsibility of the creator thread to call @p chThdWait()
* and then release the allocated memory.
*
* @param[in] heapp heap from which allocate the memory or @p NULL for the
* default heap
* @param[in] size size of the working area to be allocated
* @param[in] name thread name
* @param[in] prio the priority level for the new thread
* @param[in] pf the thread function
* @param[in] arg an argument passed to the thread function. It can be
* @p NULL.
* @return The pointer to the @p thread_t structure allocated for
* the thread into the working space area.
* @retval NULL if the memory cannot be allocated.
*
* @api
*/
thread_t *chThdCreateFromHeap(memory_heap_t *heapp, size_t size,
const char *name, tprio_t prio,
tfunc_t pf, void *arg) {
thread_t *tp;
void *wsp;
wsp = chHeapAllocAligned(heapp, size, PORT_WORKING_AREA_ALIGN);
if (wsp == NULL) {
return NULL;
}
thread_descriptor_t td = {
name,
wsp,
(stkalign_t *)((uint8_t *)wsp + size),
prio,
pf,
arg
};
#if CH_DBG_FILL_THREADS == TRUE
_thread_memfill((uint8_t *)wsp,
(uint8_t *)wsp + size,
CH_DBG_STACK_FILL_VALUE);
#endif
chSysLock();
tp = chThdCreateSuspendedI(&td);
tp->flags = CH_FLAG_MODE_HEAP;
chSchWakeupS(tp, MSG_OK);
chSysUnlock();
return tp;
}
#endif /* CH_CFG_USE_HEAP == TRUE */
#if (CH_CFG_USE_MEMPOOLS == TRUE) || defined(__DOXYGEN__)
/**
* @brief Creates a new thread allocating the memory from the specified
* memory pool.
* @pre The configuration options @p CH_CFG_USE_DYNAMIC and
* @p CH_CFG_USE_MEMPOOLS must be enabled in order to use this
* function.
* @pre The pool must be initialized to contain only objects with
* alignment @p PORT_WORKING_AREA_ALIGN.
* @note A thread can terminate by calling @p chThdExit() or by simply
* returning from its main function.
* @note The memory allocated for the thread is not released automatically,
* it is responsibility of the creator thread to call @p chThdWait()
* and then release the allocated memory.
*
* @param[in] mp pointer to the memory pool object
* @param[in] name thread name
* @param[in] prio the priority level for the new thread
* @param[in] pf the thread function
* @param[in] arg an argument passed to the thread function. It can be
* @p NULL.
* @return The pointer to the @p thread_t structure allocated for
* the thread into the working space area.
* @retval NULL if the memory pool is empty.
*
* @api
*/
thread_t *chThdCreateFromMemoryPool(memory_pool_t *mp, const char *name,
tprio_t prio, tfunc_t pf, void *arg) {
thread_t *tp;
void *wsp;
chDbgCheck(mp != NULL);
wsp = chPoolAlloc(mp);
if (wsp == NULL) {
return NULL;
}
thread_descriptor_t td = {
name,
wsp,
(stkalign_t *)((uint8_t *)wsp + mp->object_size),
prio,
pf,
arg
};
#if CH_DBG_FILL_THREADS == TRUE
_thread_memfill((uint8_t *)wsp,
(uint8_t *)wsp + mp->object_size,
CH_DBG_STACK_FILL_VALUE);
#endif
chSysLock();
tp = chThdCreateSuspendedI(&td);
tp->flags = CH_FLAG_MODE_MPOOL;
tp->mpool = mp;
chSchWakeupS(tp, MSG_OK);
chSysUnlock();
return tp;
}
#endif /* CH_CFG_USE_MEMPOOLS == TRUE */
#endif /* CH_CFG_USE_DYNAMIC == TRUE */
/** @} */
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