238 lines
8.3 KiB
C
238 lines
8.3 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 chschd.h
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* @brief Scheduler macros and structures.
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*
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* @addtogroup scheduler
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* @{
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*/
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#ifndef _CHSCHD_H_
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#define _CHSCHD_H_
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/**
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* @name Wakeup status codes
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* @{
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*/
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#define RDY_OK 0 /**< @brief Normal wakeup message. */
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#define RDY_TIMEOUT -1 /**< @brief Wakeup caused by a timeout
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condition. */
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#define RDY_RESET -2 /**< @brief Wakeup caused by a reset
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condition. */
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/** @} */
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/**
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* @name Priority constants
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* @{
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*/
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#define NOPRIO 0 /**< @brief Ready list header priority. */
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#define IDLEPRIO 1 /**< @brief Idle thread priority. */
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#define LOWPRIO 2 /**< @brief Lowest user priority. */
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#define NORMALPRIO 64 /**< @brief Normal user priority. */
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#define HIGHPRIO 127 /**< @brief Highest user priority. */
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#define ABSPRIO 255 /**< @brief Greatest possible priority. */
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/** @} */
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/**
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* @name Special time constants
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* @{
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*/
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/**
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* @brief Zero time specification for some functions with a timeout
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* specification.
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* @note Not all functions accept @p TIME_IMMEDIATE as timeout parameter,
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* see the specific function documentation.
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*/
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#define TIME_IMMEDIATE ((systime_t)0)
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/**
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* @brief Infinite time specification for all functions with a timeout
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* specification.
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*/
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#define TIME_INFINITE ((systime_t)-1)
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/** @} */
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/**
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* @brief Returns the priority of the first thread on the given ready list.
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*
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* @notapi
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*/
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#define firstprio(rlp) ((rlp)->p_next->p_prio)
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/**
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* @extends ThreadsQueue
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*
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* @brief Ready list header.
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*/
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#if !defined(PORT_OPTIMIZED_READYLIST_STRUCT) || defined(__DOXYGEN__)
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typedef struct {
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ThreadsQueue r_queue; /**< @brief Threads queue. */
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tprio_t r_prio; /**< @brief This field must be
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initialized to zero. */
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struct context r_ctx; /**< @brief Not used, present because
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offsets. */
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#if CH_USE_REGISTRY || defined(__DOXYGEN__)
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Thread *r_newer; /**< @brief Newer registry element. */
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Thread *r_older; /**< @brief Older registry element. */
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#endif
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/* End of the fields shared with the Thread structure.*/
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Thread *r_current; /**< @brief The currently running
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thread. */
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} ReadyList;
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#endif /* !defined(PORT_OPTIMIZED_READYLIST_STRUCT) */
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#if !defined(PORT_OPTIMIZED_RLIST_EXT) && !defined(__DOXYGEN__)
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extern ReadyList rlist;
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#endif /* !defined(PORT_OPTIMIZED_RLIST_EXT) */
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/**
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* @brief Current thread pointer access macro.
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* @note This macro is not meant to be used in the application code but
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* only from within the kernel, use the @p chThdSelf() API instead.
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* @note It is forbidden to use this macro in order to change the pointer
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* (currp = something), use @p setcurrp() instead.
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*/
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#if !defined(PORT_OPTIMIZED_CURRP) || defined(__DOXYGEN__)
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#define currp rlist.r_current
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#endif /* !defined(PORT_OPTIMIZED_CURRP) */
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/**
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* @brief Current thread pointer change macro.
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* @note This macro is not meant to be used in the application code but
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* only from within the kernel.
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*
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* @notapi
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*/
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#if !defined(PORT_OPTIMIZED_SETCURRP) || defined(__DOXYGEN__)
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#define setcurrp(tp) (currp = (tp))
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#endif /* !defined(PORT_OPTIMIZED_SETCURRP) */
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/*
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* Scheduler APIs.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void _scheduler_init(void);
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#if !defined(PORT_OPTIMIZED_READYI)
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Thread *chSchReadyI(Thread *tp);
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#endif
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#if !defined(PORT_OPTIMIZED_GOSLEEPS)
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void chSchGoSleepS(tstate_t newstate);
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#endif
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#if !defined(PORT_OPTIMIZED_GOSLEEPTIMEOUTS)
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msg_t chSchGoSleepTimeoutS(tstate_t newstate, systime_t time);
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#endif
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#if !defined(PORT_OPTIMIZED_WAKEUPS)
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void chSchWakeupS(Thread *tp, msg_t msg);
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#endif
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#if !defined(PORT_OPTIMIZED_RESCHEDULES)
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void chSchRescheduleS(void);
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#endif
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#if !defined(PORT_OPTIMIZED_ISPREEMPTIONREQUIRED)
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bool_t chSchIsPreemptionRequired(void);
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#endif
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#if !defined(PORT_OPTIMIZED_DORESCHEDULEBEHIND) || defined(__DOXYGEN__)
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void chSchDoRescheduleBehind(void);
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#endif
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#if !defined(PORT_OPTIMIZED_DORESCHEDULEAHEAD) || defined(__DOXYGEN__)
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void chSchDoRescheduleAhead(void);
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#endif
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#if !defined(PORT_OPTIMIZED_DORESCHEDULE)
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void chSchDoReschedule(void);
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#endif
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#ifdef __cplusplus
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}
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#endif
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Determines if the current thread must reschedule.
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* @details This function returns @p TRUE if there is a ready thread with
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* higher priority.
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*
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* @iclass
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*/
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#if !defined(PORT_OPTIMIZED_ISRESCHREQUIREDI) || defined(__DOXYGEN__)
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#define chSchIsRescRequiredI() (firstprio(&rlist.r_queue) > currp->p_prio)
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#endif /* !defined(PORT_OPTIMIZED_ISRESCHREQUIREDI) */
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/**
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* @brief Determines if yielding is possible.
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* @details This function returns @p TRUE if there is a ready thread with
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* equal or higher priority.
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*
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* @sclass
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*/
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#if !defined(PORT_OPTIMIZED_CANYIELDS) || defined(__DOXYGEN__)
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#define chSchCanYieldS() (firstprio(&rlist.r_queue) >= currp->p_prio)
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#endif /* !defined(PORT_OPTIMIZED_CANYIELDS) */
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/**
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* @brief Yields the time slot.
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* @details Yields the CPU control to the next thread in the ready list with
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* equal or higher priority, if any.
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*
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* @sclass
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*/
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#if !defined(PORT_OPTIMIZED_DOYIELDS) || defined(__DOXYGEN__)
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#define chSchDoYieldS() { \
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if (chSchCanYieldS()) \
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chSchDoRescheduleBehind(); \
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}
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#endif /* !defined(PORT_OPTIMIZED_DOYIELDS) */
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/**
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* @brief Inline-able preemption code.
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* @details This is the common preemption code, this function must be invoked
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* exclusively from the port layer.
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*
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* @special
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*/
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#if (CH_TIME_QUANTUM > 0) || defined(__DOXYGEN__)
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#define chSchPreemption() { \
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tprio_t p1 = firstprio(&rlist.r_queue); \
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tprio_t p2 = currp->p_prio; \
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if (currp->p_preempt) { \
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if (p1 > p2) \
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chSchDoRescheduleAhead(); \
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} \
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else { \
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if (p1 >= p2) \
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chSchDoRescheduleBehind(); \
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} \
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}
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#else /* CH_TIME_QUANTUM == 0 */
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#define chSchPreemption() { \
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if (p1 >= p2) \
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chSchDoRescheduleAhead(); \
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}
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#endif /* CH_TIME_QUANTUM == 0 */
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/** @} */
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#endif /* _CHSCHD_H_ */
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/** @} */
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