sig_handler.h

#ifndef SIG_HANDLER_H
#define SIG_HANDLER_H
 
#include <atomic>
#include <condition_variable>
#include <csignal>
#include <functional>
#include <mutex>
 
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
 
class SigHandler {
 public:
  static SigHandler& get();
 
  SigHandler(const SigHandler&) = delete;
  SigHandler& operator=(const SigHandler&) = delete;
 
  // set an handler for signals and start the handling thread
  void start(const std::function<void()>& on_signal);
  // add hook on signal `sig`
  static void signal(int sig);
 
  bool masked();
  void mask(int secs);  // send 0 to unmask
 
 private:
  SigHandler() = default;
  ~SigHandler();
  static void signal_handler(int sig);
 
  boost::thread polling_thread_;
  static std::atomic<bool> signal_marker_;
 
  static std::mutex exit_m_;
  static std::condition_variable exit_cv_;
  static bool exit_flag_;
};
 
void signal_handler(int sig);
 
#endif /* SIG_HANDLER_H */