#include<mutex>
#include<stdio.h>
#include<thread>
#include<unistd.h>
#include<signal.h>
using namespace std;

mutex mutex_a;

void function_that_does_stuff(){
	for(;;){
		sleep(1);
		mutex_a.lock();
		// We want all this to happen together
		printf("beep  ");
		printf("beep  ");
		printf("beep  ");
		printf("beep  ");
		usleep(1);
		printf("beep\n");
		mutex_a.unlock();
	}
}

void function_that_clicks(){
	for(;;){
		sleep(1);
		mutex_a.lock();
		printf("click  ");
		printf("click  ");
		printf("click  ");
		printf("click  ");
		usleep(1);
		printf("click\n");
		mutex_a.unlock();
	}
}

void unlock(int signal){
	if(mutex_a.try_lock())
		printf("Mutex was not locked! \n");
	else
		printf("Mutex was locked, unlocking it now\n");
	mutex_a.unlock();
}

int main(){
	struct sigaction handler;
	handler.sa_handler = unlock;
	sigaction(2, &handler, 0);

	thread t_a(function_that_does_stuff);
	thread t_b(function_that_clicks);

	for(;;)
		sleep(100);
	return 0;
}