Nico De Witte / simple_task_scheduler

Simple Task Scheduler. For the moment only implements continuous running tasks and periodic tasks.

Example

two blinking leds

#include "mbed.h"

#include "task_scheduler.h"

Serial pc(USBTX, USBRX);        // tx, r

class Foo {
  DigitalOut myled1;
  int counter;

  public:
    Foo(void) :myled1(LED1) { counter = 0; }

    void alive_task(void) {
      if (counter++ % 30000 == 0) {
        myled1 = !myled1;
      }
    }
};

class Bar {
  DigitalOut myled2;

  public:
    Bar(void) :myled2(LED2) {}

    void control_task(void) {
      myled2 = !myled2;
    }
};

int main() {

    Foo foo;
    Bar bar;

    SimpleTaskScheduler::TaskScheduler scheduler;
    scheduler.create_continuous_task(&foo, &Foo::alive_task);
    scheduler.create_periodic_task(&bar, &Bar::control_task, 1);

    while(1) {
      scheduler.update();
    }
}

task_scheduler.h

Committer:
dwini
Date:
2016-12-13
Revision:
3:bd96023168df
Parent:
2:1d20f2b3c788

File content as of revision 3:bd96023168df:

#pragma once

#include <vector>
#include "continuous_task.h"
#include "periodic_task.h"

// Definition of template methods need to be inside header file.
// http://stackoverflow.com/questions/8752837/undefined-reference-to-template-class-constructor

namespace SimpleTaskScheduler {

  class TaskScheduler {

    private:
      std::vector<Task *> tasks;

    public:
      TaskScheduler(void);
      ~TaskScheduler(void);

    public:
      void update(void);
      void stop_task(unsigned int id);
      void start_task(unsigned int id);

    public:
      template<typename T> unsigned int create_continuous_task(T* object, void (T::*method)(void)) {
        Task * task = new ContinuousTask(object, method);
        return add_task(task);
      }

      template<typename T> unsigned int create_periodic_task(T* object, void (T::*method)(void), float period_seconds) {
        Task * task = new PeriodicTask(object, method, period_seconds);
        return add_task(task);
      }

    private:
      unsigned int add_task(Task * task);
  };

};