176 lines
5.9 KiB
C
176 lines
5.9 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file chregistry.c
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* @brief Threads registry code.
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*
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* @addtogroup registry
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* @details Threads Registry related APIs and services.
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*
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* <h2>Operation mode</h2>
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* The Threads Registry is a double linked list that holds all the
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* active threads in the system.<br>
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* Operations defined for the registry:
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* - <b>First</b>, returns the first, in creation order, active thread
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* in the system.
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* - <b>Next</b>, returns the next, in creation order, active thread
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* in the system.
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* .
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* The registry is meant to be mainly a debug feature, for example,
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* using the registry a debugger can enumerate the active threads
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* in any given moment or the shell can print the active threads
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* and their state.<br>
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* Another possible use is for centralized threads memory management,
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* terminating threads can pulse an event source and an event handler
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* can perform a scansion of the registry in order to recover the
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* memory.
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* @pre In order to use the threads registry the @p CH_CFG_USE_REGISTRY
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* option must be enabled in @p chconf.h.
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* @{
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*/
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#include "ch.h"
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#if CH_CFG_USE_REGISTRY || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Module exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local functions. */
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/*===========================================================================*/
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#define _offsetof(st, m) \
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((size_t)((char *)&((st *)0)->m - (char *)0))
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/*===========================================================================*/
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/* Module exported functions. */
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/*===========================================================================*/
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/*
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* OS signature in ROM plus debug-related information.
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*/
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ROMCONST chdebug_t ch_debug = {
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"main",
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(uint8_t)0,
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(uint8_t)sizeof (chdebug_t),
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(uint16_t)((CH_KERNEL_MAJOR << 11) |
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(CH_KERNEL_MINOR << 6) |
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(CH_KERNEL_PATCH) << 0),
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(uint8_t)sizeof (void *),
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(uint8_t)sizeof (systime_t),
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(uint8_t)sizeof (thread_t),
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(uint8_t)_offsetof(thread_t, p_prio),
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(uint8_t)_offsetof(thread_t, p_ctx),
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(uint8_t)_offsetof(thread_t, p_newer),
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(uint8_t)_offsetof(thread_t, p_older),
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(uint8_t)_offsetof(thread_t, p_name),
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#if CH_DBG_ENABLE_STACK_CHECK
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(uint8_t)_offsetof(thread_t, p_stklimit),
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#else
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(uint8_t)0,
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#endif
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(uint8_t)_offsetof(thread_t, p_state),
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(uint8_t)_offsetof(thread_t, p_flags),
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#if CH_CFG_USE_DYNAMIC
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(uint8_t)_offsetof(thread_t, p_refs),
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#else
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(uint8_t)0,
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#endif
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#if CH_CFG_TIME_QUANTUM > 0
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(uint8_t)_offsetof(thread_t, p_preempt),
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#else
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(uint8_t)0,
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#endif
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#if CH_DBG_THREADS_PROFILING
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(uint8_t)_offsetof(thread_t, p_time)
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#else
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(uint8_t)0
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#endif
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};
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/**
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* @brief Returns the first thread in the system.
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* @details Returns the most ancient thread in the system, usually this is
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* the main thread unless it terminated. A reference is added to the
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* returned thread in order to make sure its status is not lost.
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* @note This function cannot return @p NULL because there is always at
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* least one thread in the system.
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*
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* @return A reference to the most ancient thread.
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*
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* @api
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*/
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thread_t *chRegFirstThread(void) {
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thread_t *tp;
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chSysLock();
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tp = ch.rlist.r_newer;
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#if CH_CFG_USE_DYNAMIC
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tp->p_refs++;
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#endif
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chSysUnlock();
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return tp;
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}
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/**
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* @brief Returns the thread next to the specified one.
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* @details The reference counter of the specified thread is decremented and
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* the reference counter of the returned thread is incremented.
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*
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* @param[in] tp pointer to the thread
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* @return A reference to the next thread.
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* @retval NULL if there is no next thread.
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*
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* @api
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*/
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thread_t *chRegNextThread(thread_t *tp) {
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thread_t *ntp;
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chSysLock();
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ntp = tp->p_newer;
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if (ntp == (thread_t *)&ch.rlist)
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ntp = NULL;
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#if CH_CFG_USE_DYNAMIC
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else {
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chDbgAssert(ntp->p_refs < 255, "too many references");
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ntp->p_refs++;
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}
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#endif
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chSysUnlock();
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#if CH_CFG_USE_DYNAMIC
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chThdRelease(tp);
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#endif
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return ntp;
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}
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#endif /* CH_CFG_USE_REGISTRY */
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/** @} */
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