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scheduler.c
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scheduler.c
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/*!
* \file
* Scheduler
*/
/*
* zlib License
*
* Copyright (C) 2016-2017 KOBAYASHI Daisuke
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "scheduler.h"
typedef struct {
int32_t remain;
int32_t start;
int32_t interval;
void (*job)(void);
} job_t;
static job_t l_job[SCHEDULER_JOB_NUM];
static uint32_t l_tick;
static bool l_active;
/*! Initialize */
void Scheduler_Init(void)
{
l_tick = 0;
l_active = false;
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
l_job[i].job = 0;
}
}
/*! Start
* \param tick System tick
*/
void Scheduler_Start(uint32_t tick)
{
l_tick = tick;
l_active = true;
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
l_job[i].remain = l_job[i].start;
}
}
/*! Stop */
void Scheduler_Stop(void) { l_active = false; }
/*! Register job
* \param start Delay time
* \param interval Time interval
* \param job Job
*/
bool Scheduler_Register(uint32_t start, uint32_t interval, void (*job)(void))
{
if (!job) {
return false;
}
if ((start > (uint32_t)INT32_MAX) || (interval > (uint32_t)INT32_MAX)) {
return false;
}
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
if (l_job[i].job == job) {
return false;
}
}
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
if (l_job[i].job) {
continue;
}
l_job[i].remain = (int32_t)start;
l_job[i].start = (int32_t)start;
l_job[i].interval = (int32_t)interval;
l_job[i].job = job;
return true;
}
return false;
}
/*! Unregister job */
bool Scheduler_Unregister(void (*job)(void))
{
if (!job) {
return false;
}
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
if (l_job[i].job == job) {
l_job[i].job = 0;
return true;
}
}
return false;
}
/*! Run scheduler
* \param tick System tick
*/
void Scheduler_Run(uint32_t tick)
{
if (!l_active) {
return;
}
uint32_t diff = tick - l_tick;
if (diff > (uint32_t)INT32_MAX) {
diff = (uint32_t)INT32_MAX;
}
l_tick = tick;
for (int i = 0; i < SCHEDULER_JOB_NUM; ++i) {
if (!l_job[i].job) {
continue;
}
l_job[i].remain -= (int32_t)diff;
if (l_job[i].remain <= 0) {
l_job[i].remain = l_job[i].interval;
l_job[i].job();
}
}
}