176 lines
5.9 KiB
C
176 lines
5.9 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012,2013,2014 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 chregistry.c
|
|
* @brief Threads registry code.
|
|
*
|
|
* @addtogroup registry
|
|
* @details Threads Registry related APIs and services.
|
|
*
|
|
* <h2>Operation mode</h2>
|
|
* The Threads Registry is a double linked list that holds all the
|
|
* active threads in the system.<br>
|
|
* Operations defined for the registry:
|
|
* - <b>First</b>, returns the first, in creation order, active thread
|
|
* in the system.
|
|
* - <b>Next</b>, returns the next, in creation order, active thread
|
|
* in the system.
|
|
* .
|
|
* The registry is meant to be mainly a debug feature, for example,
|
|
* using the registry a debugger can enumerate the active threads
|
|
* in any given moment or the shell can print the active threads
|
|
* and their state.<br>
|
|
* Another possible use is for centralized threads memory management,
|
|
* terminating threads can pulse an event source and an event handler
|
|
* can perform a scansion of the registry in order to recover the
|
|
* memory.
|
|
* @pre In order to use the threads registry the @p CH_CFG_USE_REGISTRY
|
|
* option must be enabled in @p chconf.h.
|
|
* @{
|
|
*/
|
|
#include "ch.h"
|
|
|
|
#if CH_CFG_USE_REGISTRY || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local types. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local functions. */
|
|
/*===========================================================================*/
|
|
|
|
#define _offsetof(st, m) \
|
|
((size_t)((char *)&((st *)0)->m - (char *)0))
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*
|
|
* OS signature in ROM plus debug-related information.
|
|
*/
|
|
ROMCONST chdebug_t ch_debug = {
|
|
"main",
|
|
(uint8_t)0,
|
|
(uint8_t)sizeof (chdebug_t),
|
|
(uint16_t)((CH_KERNEL_MAJOR << 11) |
|
|
(CH_KERNEL_MINOR << 6) |
|
|
(CH_KERNEL_PATCH) << 0),
|
|
(uint8_t)sizeof (void *),
|
|
(uint8_t)sizeof (systime_t),
|
|
(uint8_t)sizeof (thread_t),
|
|
(uint8_t)_offsetof(thread_t, p_prio),
|
|
(uint8_t)_offsetof(thread_t, p_ctx),
|
|
(uint8_t)_offsetof(thread_t, p_newer),
|
|
(uint8_t)_offsetof(thread_t, p_older),
|
|
(uint8_t)_offsetof(thread_t, p_name),
|
|
#if CH_DBG_ENABLE_STACK_CHECK
|
|
(uint8_t)_offsetof(thread_t, p_stklimit),
|
|
#else
|
|
(uint8_t)0,
|
|
#endif
|
|
(uint8_t)_offsetof(thread_t, p_state),
|
|
(uint8_t)_offsetof(thread_t, p_flags),
|
|
#if CH_CFG_USE_DYNAMIC
|
|
(uint8_t)_offsetof(thread_t, p_refs),
|
|
#else
|
|
(uint8_t)0,
|
|
#endif
|
|
#if CH_CFG_TIME_QUANTUM > 0
|
|
(uint8_t)_offsetof(thread_t, p_preempt),
|
|
#else
|
|
(uint8_t)0,
|
|
#endif
|
|
#if CH_DBG_THREADS_PROFILING
|
|
(uint8_t)_offsetof(thread_t, p_time)
|
|
#else
|
|
(uint8_t)0
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* @brief Returns the first thread in the system.
|
|
* @details Returns the most ancient thread in the system, usually this is
|
|
* the main thread unless it terminated. A reference is added to the
|
|
* returned thread in order to make sure its status is not lost.
|
|
* @note This function cannot return @p NULL because there is always at
|
|
* least one thread in the system.
|
|
*
|
|
* @return A reference to the most ancient thread.
|
|
*
|
|
* @api
|
|
*/
|
|
thread_t *chRegFirstThread(void) {
|
|
thread_t *tp;
|
|
|
|
chSysLock();
|
|
tp = ch.rlist.r_newer;
|
|
#if CH_CFG_USE_DYNAMIC
|
|
tp->p_refs++;
|
|
#endif
|
|
chSysUnlock();
|
|
return tp;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the thread next to the specified one.
|
|
* @details The reference counter of the specified thread is decremented and
|
|
* the reference counter of the returned thread is incremented.
|
|
*
|
|
* @param[in] tp pointer to the thread
|
|
* @return A reference to the next thread.
|
|
* @retval NULL if there is no next thread.
|
|
*
|
|
* @api
|
|
*/
|
|
thread_t *chRegNextThread(thread_t *tp) {
|
|
thread_t *ntp;
|
|
|
|
chSysLock();
|
|
ntp = tp->p_newer;
|
|
if (ntp == (thread_t *)&ch.rlist)
|
|
ntp = NULL;
|
|
#if CH_CFG_USE_DYNAMIC
|
|
else {
|
|
chDbgAssert(ntp->p_refs < 255, "too many references");
|
|
ntp->p_refs++;
|
|
}
|
|
#endif
|
|
chSysUnlock();
|
|
#if CH_CFG_USE_DYNAMIC
|
|
chThdRelease(tp);
|
|
#endif
|
|
return ntp;
|
|
}
|
|
|
|
#endif /* CH_CFG_USE_REGISTRY */
|
|
|
|
/** @} */
|