/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2012 University of Bonn. All rights reserved.
 * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
 */

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

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

#include "CodePatterns/MemDebug.hpp"

#include <signal.h>

#include "CodePatterns/Log.hpp"

#include "SignalHandler.hpp"
  
boost::function<void (int)> SignalHandler::signalhandler_fct = 0;

void signalhandler(int sig) {
  SignalHandler::signalhandler_fct(sig);
}

SignalHandler::SignalHandler(boost::function<void (int)> &_shutdownfunction, std::vector<size_t> &_signals) :
  shutdownfunction(_shutdownfunction),
  signals(_signals),
  NoSignalsReceived(0),
  MAX_NOSIGNALSRECEIVED(3)
{
  if (!signalhandler_fct)
    signalhandler_fct = boost::bind(&SignalHandler::operator(), this, _1);
  obtainAllHooks();
}

SignalHandler::~SignalHandler()
{
  releaseAllHooks();
}

void SignalHandler::operator()(int sig)
{
  // increment received signal counter
  ++NoSignalsReceived;

  // shutdown if we have handler
  if (shutdownfunction)
    shutdownfunction(sig);

  if (NoSignalsReceived >= MAX_NOSIGNALSRECEIVED)
    releaseAllHooks();
}

void SignalHandler::obtainAllHooks()
{
  for (std::vector<size_t>::const_iterator iter = signals.begin();
      iter != signals.end(); ++iter) {
    LOG(0, "STATUS: Catching signal " << *iter << " via signal handler.");
    signal(*iter, signalhandler);
  }
}

void SignalHandler::releaseAllHooks()
{
  // release signal hook again
  for (std::vector<size_t>::const_iterator iter = signals.begin();
      iter != signals.end(); ++iter)
    signal(*iter, NULL);
  signals.clear();
}