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();
    }
}

Diff: task_scheduler.h

Revision:
0:ba0870ec8714
Child:
2:1d20f2b3c788
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task_scheduler.h	Mon Jul 11 14:58:22 2016 +0000
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <vector>
+#include "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);
+
+    public:
+      template<typename T> int create_continuous_task(T* object, void (T::*method)(void)) {
+        Task * task = new Task(object, method);
+        return add_task(task);
+      }
+
+      template<typename T> int create_periodic_task(T* object, void (T::*method)(void), int period_seconds) {
+        Task * task = new PeriodicTask(object, method, period_seconds);
+        return add_task(task);
+      }
+
+    private:
+      int add_task(Task * task);
+  };
+
+};