/*
 * SignalHandler.hpp
 *
 *  Created on: 01.06.2012
 *      Author: heber
 */

#ifndef SIGNALHANDLER_HPP_
#define SIGNALHANDLER_HPP_

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <boost/function.hpp>
#include <vector>

struct SignalHandler
{
  /** Constructor for class SignalHandler.
   *
   * \param _shutdownfunction function to call when signal has been received.
   * \param _signals vector of all signals to catch
   */
  SignalHandler(boost::function<void (int)> &_shutdownfunction, std::vector<size_t> &_signals);
  /** Destructor for class SignalHandler.
   *
   */
  ~SignalHandler();

private:
  /** Obtains all signals in \a signals.
   *
   */
  void obtainAllHooks();

  /** Releases all signal hooks.
   *
   */
  void releaseAllHooks();

  /** Internal signal handler for a  \a sig
   *
   * \param sig signal to catch
   */
  void operator()(int sig);

private:
  //!> shutdown function to call on signal
  boost::function<void (int)> shutdownfunction;
  //!> signal vector for later releasing
  std::vector<size_t> signals;
  //!> counter for the number of received signals
  size_t NoSignalsReceived;
  //!> maximum number of received signals after which the handlers are released
  const size_t MAX_NOSIGNALSRECEIVED;

  //!> grant global function signalhandler access to private signalhandler function
  friend void signalhandler(int sig);
  //!> static function to be called by global function signalhandler
  static boost::function<void (int)> signalhandler_fct;
};


#endif /* SIGNALHANDLER_HPP_ */