main.cpp

#include <mbed.h>


DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);

// Interrupt Handler
InterruptIn theButton(BUTTON1);

//Create an empty thread object ready to attach a function
Thread thread;
Thread thread2;

//Function to deal with blinking the second LED
void led2_thread() {
	//Loop forever
	while (true) {
		led2 = !led2;
		thread_sleep_for(5000);

	// Set a Signal to blink LED3
    thread2.flags_set(0x42);
	}
}

void led3_thread() {
	//Loop forever.
  while (1){
	//With for the Signal before continuing
	ThisThread::flags_wait_any(0x42);
	  for (int x=0; x<5; x++) {
		  led3 = !led3;
		  thread_sleep_for(100);
	  }
  }
}

void buttonHandler(){
	// Button handler interrupt, also sets flags.
	thread2.flags_set(0x42);
}

//Main Program
int main() {

	//Bind the interupt to a function
	theButton.rise(&buttonHandler);

	//Attach the function to the Thread then Start it
  	thread.start(led2_thread);
  	thread2.start(led3_thread);
		while (true) {
		led1 = !led1;
		thread_sleep_for(500);
		}
}