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127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @defgroup core_sched Scheduler
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* @ingroup core
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* @brief The RIOT scheduler
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* @{
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*
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* @file sched.h
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* @brief Scheduler API definion
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*/
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#ifndef _SCHEDULER_H
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#define _SCHEDULER_H
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#include <stddef.h>
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#include "bitarithm.h"
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#include "tcb.h"
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#include "attributes.h"
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#define MAXTHREADS 32 /**< the maximum number of threads to be scheduled */
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/**
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* @def SCHED_PRIO_LEVELS
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* @brief The number of thread priority levels
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*/
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#if ARCH_32_BIT
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#define SCHED_PRIO_LEVELS 32
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#else
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#define SCHED_PRIO_LEVELS 16
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#endif
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/**
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* @brief Triggers the scheduler to schedule the next thread
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*/
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void sched_run(void);
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/**
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* @brief Set the status of the specified process
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*
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* @param[in] process Pointer to the thread control block of the
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* targeted process
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* @param[in] status The new status of this thread
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*/
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void sched_set_status(tcb_t *process, unsigned int status);
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/**
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* @brief Compare thread priorities and yield() (or set
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* sched_context_switch_request if inISR()) when other_prio is higher
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* (has a lower value) than the current thread's priority
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*
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* @param[in] other_prio The priority of the target thread
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*/
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void sched_switch(uint16_t other_prio);
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/**
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* @brief Call context switching at thread exit
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*/
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NORETURN void cpu_switch_context_exit(void);
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/**
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* Flag indicating whether a context switch is necessary after handling an
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* interrupt. Supposed to be set in an ISR.
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*/
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extern volatile unsigned int sched_context_switch_request;
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/**
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* Thread table
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*/
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extern volatile tcb_t *sched_threads[MAXTHREADS];
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/**
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* Currently active thread
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*/
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extern volatile tcb_t *sched_active_thread;
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/**
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* Number of running (non-terminated) threads
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*/
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extern volatile int sched_num_threads;
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/**
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* Process ID of active thread
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*/
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extern volatile int sched_active_pid;
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/**
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* List of runqueues per priority level
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*/
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extern clist_node_t *runqueues[SCHED_PRIO_LEVELS];
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#if SCHEDSTATISTICS
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/**
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* Scheduler statistics
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*/
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typedef struct {
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unsigned int laststart; /**< Time stamp of the last time this thread was
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scheduled to run */
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unsigned int schedules; /**< How often the thread was scheduled to run */
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unsigned long runtime_ticks; /**< The total runtime of this thread in ticks */
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} schedstat;
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/**
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* Thread statistics table
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*/
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extern schedstat sched_pidlist[MAXTHREADS];
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/**
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* @brief Register a callback that will be called on every scheduler run
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*
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* @param[in] callback The callback functions the will be called
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*/
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void sched_register_cb(void (*callback)(uint32_t, uint32_t));
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#endif
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#endif // _SCHEDULER_H
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/** @} */
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