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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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/RT 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_USE_DYNAMIC || defined(__DOXYGEN__)
/**
* @brief Adds a reference to a thread object.
* @pre The configuration option @p CH_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 *chThdAddRef(Thread *tp) {
chSysLock();
chDbgAssert(tp->p_refs < 255, "chThdAddRef(), #1", "too many references");
tp->p_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 THD_STATE_FINAL state then the thread's memory is
* returned to the proper allocator.
* @pre The configuration option @p CH_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 *tp) {
trefs_t refs;
chSysLock();
chDbgAssert(tp->p_refs > 0, "chThdRelease(), #1", "not referenced");
refs = --tp->p_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 == 0) && (tp->p_state == THD_STATE_FINAL)) {
switch (tp->p_flags & THD_MEM_MODE_MASK) {
#if CH_USE_HEAP
case THD_MEM_MODE_HEAP:
#if CH_USE_REGISTRY
REG_REMOVE(tp);
#endif
chHeapFree(tp);
break;
#endif
#if CH_USE_MEMPOOLS
case THD_MEM_MODE_MEMPOOL:
#if CH_USE_REGISTRY
REG_REMOVE(tp);
#endif
chPoolFree(tp->p_mpool, tp);
break;
#endif
}
}
}
#if CH_USE_HEAP || defined(__DOXYGEN__)
/**
* @brief Creates a new thread allocating the memory from the heap.
* @pre The configuration options @p CH_USE_DYNAMIC and @p CH_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 when the thread
* terminates but when a @p chThdWait() is performed.
*
* @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] 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 structure allocated for
* the thread into the working space area.
* @retval NULL if the memory cannot be allocated.
*
* @api
*/
Thread *chThdCreateFromHeap(MemoryHeap *heapp, size_t size,
tprio_t prio, tfunc_t pf, void *arg) {
void *wsp;
Thread *tp;
wsp = chHeapAlloc(heapp, size);
if (wsp == NULL)
return NULL;
#if CH_DBG_FILL_THREADS
_thread_memfill((uint8_t *)wsp,
(uint8_t *)wsp + sizeof(Thread),
CH_THREAD_FILL_VALUE);
_thread_memfill((uint8_t *)wsp + sizeof(Thread),
(uint8_t *)wsp + size,
CH_STACK_FILL_VALUE);
#endif
chSysLock();
tp = chThdCreateI(wsp, size, prio, pf, arg);
tp->p_flags = THD_MEM_MODE_HEAP;
chSchWakeupS(tp, RDY_OK);
chSysUnlock();
return tp;
}
#endif /* CH_USE_HEAP */
#if CH_USE_MEMPOOLS || defined(__DOXYGEN__)
/**
* @brief Creates a new thread allocating the memory from the specified
* memory pool.
* @pre The configuration options @p CH_USE_DYNAMIC and @p CH_USE_MEMPOOLS
* 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 when the thread
* terminates but when a @p chThdWait() is performed.
*
* @param[in] mp pointer to the memory pool object
* @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 structure allocated for
* the thread into the working space area.
* @retval NULL if the memory pool is empty.
*
* @api
*/
Thread *chThdCreateFromMemoryPool(MemoryPool *mp, tprio_t prio,
tfunc_t pf, void *arg) {
void *wsp;
Thread *tp;
chDbgCheck(mp != NULL, "chThdCreateFromMemoryPool");
wsp = chPoolAlloc(mp);
if (wsp == NULL)
return NULL;
#if CH_DBG_FILL_THREADS
_thread_memfill((uint8_t *)wsp,
(uint8_t *)wsp + sizeof(Thread),
CH_THREAD_FILL_VALUE);
_thread_memfill((uint8_t *)wsp + sizeof(Thread),
(uint8_t *)wsp + mp->mp_object_size,
CH_STACK_FILL_VALUE);
#endif
chSysLock();
tp = chThdCreateI(wsp, mp->mp_object_size, prio, pf, arg);
tp->p_flags = THD_MEM_MODE_MEMPOOL;
tp->p_mpool = mp;
chSchWakeupS(tp, RDY_OK);
chSysUnlock();
return tp;
}
#endif /* CH_USE_MEMPOOLS */
#endif /* CH_USE_DYNAMIC */
/** @} */
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