93 lines
1.3 KiB
C
93 lines
1.3 KiB
C
/******************************************************************************
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*
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* Copyright (c) 2017-2020 by Löwenware Ltd
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* Please, refer LICENSE file for legal information
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*
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******************************************************************************/
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/**
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* @file scheduler.c
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* @author Ilja Kartašov <ik@lowenware.com>
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* @brief
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*
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* @see https://lowenware.com/
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*/
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#include "scheduler.h"
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static struct KTask *m_first = NULL, *m_last, *m_current = NULL;
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static KPid m_pid = 0;
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static void
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_disable_preempt(void)
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{
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m_current->preempt++;
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}
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static void
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_enable_preempt(void)
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{
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m_current->preempt--;
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}
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static void
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_switch(void)
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{
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struct KTask *i, *next;
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long p = 0;
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_disable_preempt();
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for (;;) {
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/* check urgent tasks */
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for (i = m_first; i != NULL; i = i->next) {
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if (!i->state && i->counter > p) {
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p = i->counter;
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next = i;
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}
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i = i->next;
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}
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if (p) {
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break;
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}
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i = m_first;
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for (i = m_first; i != NULL; i = i->next) {
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i->counter = i->priority;
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}
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}
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aarch64_switch(m_current, next);
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_enable_preempt();
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}
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void
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scheduler_init(void)
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{
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}
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KPid
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scheduler_add(struct KTask *task)
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{
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KPid result = ++m_pid;
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task->pid = result;
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task->prev = m_last;
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m_last->next = task;
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return result;
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}
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void
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scheduler_switch(void)
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{
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}
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void
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scheduler_switch_from_isr(void)
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{
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}
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