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-rw-r--r--os/kernel/include/chschd.h237
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diff --git a/os/kernel/include/chschd.h b/os/kernel/include/chschd.h
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-/*
- ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
- 2011,2012,2013 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 chschd.h
- * @brief Scheduler macros and structures.
- *
- * @addtogroup scheduler
- * @{
- */
-
-#ifndef _CHSCHD_H_
-#define _CHSCHD_H_
-
-/**
- * @name Wakeup status codes
- * @{
- */
-#define RDY_OK 0 /**< @brief Normal wakeup message. */
-#define RDY_TIMEOUT -1 /**< @brief Wakeup caused by a timeout
- condition. */
-#define RDY_RESET -2 /**< @brief Wakeup caused by a reset
- condition. */
-/** @} */
-
-/**
- * @name Priority constants
- * @{
- */
-#define NOPRIO 0 /**< @brief Ready list header priority. */
-#define IDLEPRIO 1 /**< @brief Idle thread priority. */
-#define LOWPRIO 2 /**< @brief Lowest user priority. */
-#define NORMALPRIO 64 /**< @brief Normal user priority. */
-#define HIGHPRIO 127 /**< @brief Highest user priority. */
-#define ABSPRIO 255 /**< @brief Greatest possible priority. */
-/** @} */
-
-/**
- * @name Special time constants
- * @{
- */
-/**
- * @brief Zero time specification for some functions with a timeout
- * specification.
- * @note Not all functions accept @p TIME_IMMEDIATE as timeout parameter,
- * see the specific function documentation.
- */
-#define TIME_IMMEDIATE ((systime_t)0)
-
-/**
- * @brief Infinite time specification for all functions with a timeout
- * specification.
- */
-#define TIME_INFINITE ((systime_t)-1)
-/** @} */
-
-/**
- * @brief Returns the priority of the first thread on the given ready list.
- *
- * @notapi
- */
-#define firstprio(rlp) ((rlp)->p_next->p_prio)
-
-/**
- * @extends ThreadsQueue
- *
- * @brief Ready list header.
- */
-#if !defined(PORT_OPTIMIZED_READYLIST_STRUCT) || defined(__DOXYGEN__)
-typedef struct {
- ThreadsQueue r_queue; /**< @brief Threads queue. */
- tprio_t r_prio; /**< @brief This field must be
- initialized to zero. */
- struct context r_ctx; /**< @brief Not used, present because
- offsets. */
-#if CH_USE_REGISTRY || defined(__DOXYGEN__)
- Thread *r_newer; /**< @brief Newer registry element. */
- Thread *r_older; /**< @brief Older registry element. */
-#endif
- /* End of the fields shared with the Thread structure.*/
- Thread *r_current; /**< @brief The currently running
- thread. */
-} ReadyList;
-#endif /* !defined(PORT_OPTIMIZED_READYLIST_STRUCT) */
-
-#if !defined(PORT_OPTIMIZED_RLIST_EXT) && !defined(__DOXYGEN__)
-extern ReadyList rlist;
-#endif /* !defined(PORT_OPTIMIZED_RLIST_EXT) */
-
-/**
- * @brief Current thread pointer access macro.
- * @note This macro is not meant to be used in the application code but
- * only from within the kernel, use the @p chThdSelf() API instead.
- * @note It is forbidden to use this macro in order to change the pointer
- * (currp = something), use @p setcurrp() instead.
- */
-#if !defined(PORT_OPTIMIZED_CURRP) || defined(__DOXYGEN__)
-#define currp rlist.r_current
-#endif /* !defined(PORT_OPTIMIZED_CURRP) */
-
-/**
- * @brief Current thread pointer change macro.
- * @note This macro is not meant to be used in the application code but
- * only from within the kernel.
- *
- * @notapi
- */
-#if !defined(PORT_OPTIMIZED_SETCURRP) || defined(__DOXYGEN__)
-#define setcurrp(tp) (currp = (tp))
-#endif /* !defined(PORT_OPTIMIZED_SETCURRP) */
-
-/*
- * Scheduler APIs.
- */
-#ifdef __cplusplus
-extern "C" {
-#endif
- void _scheduler_init(void);
-#if !defined(PORT_OPTIMIZED_READYI)
- Thread *chSchReadyI(Thread *tp);
-#endif
-#if !defined(PORT_OPTIMIZED_GOSLEEPS)
- void chSchGoSleepS(tstate_t newstate);
-#endif
-#if !defined(PORT_OPTIMIZED_GOSLEEPTIMEOUTS)
- msg_t chSchGoSleepTimeoutS(tstate_t newstate, systime_t time);
-#endif
-#if !defined(PORT_OPTIMIZED_WAKEUPS)
- void chSchWakeupS(Thread *tp, msg_t msg);
-#endif
-#if !defined(PORT_OPTIMIZED_RESCHEDULES)
- void chSchRescheduleS(void);
-#endif
-#if !defined(PORT_OPTIMIZED_ISPREEMPTIONREQUIRED)
- bool_t chSchIsPreemptionRequired(void);
-#endif
-#if !defined(PORT_OPTIMIZED_DORESCHEDULEBEHIND) || defined(__DOXYGEN__)
- void chSchDoRescheduleBehind(void);
-#endif
-#if !defined(PORT_OPTIMIZED_DORESCHEDULEAHEAD) || defined(__DOXYGEN__)
- void chSchDoRescheduleAhead(void);
-#endif
-#if !defined(PORT_OPTIMIZED_DORESCHEDULE)
- void chSchDoReschedule(void);
-#endif
-#ifdef __cplusplus
-}
-#endif
-
-/**
- * @name Macro Functions
- * @{
- */
-/**
- * @brief Determines if the current thread must reschedule.
- * @details This function returns @p TRUE if there is a ready thread with
- * higher priority.
- *
- * @iclass
- */
-#if !defined(PORT_OPTIMIZED_ISRESCHREQUIREDI) || defined(__DOXYGEN__)
-#define chSchIsRescRequiredI() (firstprio(&rlist.r_queue) > currp->p_prio)
-#endif /* !defined(PORT_OPTIMIZED_ISRESCHREQUIREDI) */
-
-/**
- * @brief Determines if yielding is possible.
- * @details This function returns @p TRUE if there is a ready thread with
- * equal or higher priority.
- *
- * @sclass
- */
-#if !defined(PORT_OPTIMIZED_CANYIELDS) || defined(__DOXYGEN__)
-#define chSchCanYieldS() (firstprio(&rlist.r_queue) >= currp->p_prio)
-#endif /* !defined(PORT_OPTIMIZED_CANYIELDS) */
-
-/**
- * @brief Yields the time slot.
- * @details Yields the CPU control to the next thread in the ready list with
- * equal or higher priority, if any.
- *
- * @sclass
- */
-#if !defined(PORT_OPTIMIZED_DOYIELDS) || defined(__DOXYGEN__)
-#define chSchDoYieldS() { \
- if (chSchCanYieldS()) \
- chSchDoRescheduleBehind(); \
-}
-#endif /* !defined(PORT_OPTIMIZED_DOYIELDS) */
-
-/**
- * @brief Inline-able preemption code.
- * @details This is the common preemption code, this function must be invoked
- * exclusively from the port layer.
- *
- * @special
- */
-#if (CH_TIME_QUANTUM > 0) || defined(__DOXYGEN__)
-#define chSchPreemption() { \
- tprio_t p1 = firstprio(&rlist.r_queue); \
- tprio_t p2 = currp->p_prio; \
- if (currp->p_preempt) { \
- if (p1 > p2) \
- chSchDoRescheduleAhead(); \
- } \
- else { \
- if (p1 >= p2) \
- chSchDoRescheduleBehind(); \
- } \
-}
-#else /* CH_TIME_QUANTUM == 0 */
-#define chSchPreemption() { \
- if (p1 >= p2) \
- chSchDoRescheduleAhead(); \
-}
-#endif /* CH_TIME_QUANTUM == 0 */
-/** @} */
-
-#endif /* _CHSCHD_H_ */
-
-/** @} */
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