Getting and processing system signals as tasks

When writing some server application (especially for Linux OS), catching and processing the signals is required. Usually, all the signal handlers are set up at server start and do not change during the application's execution.

The goal of this recipe is to make our tasks_processor class capable of processing signals.

Getting ready

We will need code from the first recipe of this chapter. A sound knowledge of Boost.Function is also required.

This recipe requires linking with the boost_system and boost_thread libraries.

How to do it...

This recipe is similar to the recipes from 2 to 4 of this chapter: we have async signal waiting functions, some async signal handlers, and some support code.

1. Let's start by including the following headers:

#include <boost/asio/signal_set.hpp> 
#include <boost/function.hpp> 

2. Now, we add a member for signals processing to the tasks_processor class:

protected:
    static boost::asio::signal_set& signals() {
 ...