PtrAccessSEGVHandler.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef CXXUTILS_PTRACCESSSEGVHANDLER_H
#define CXXUTILS_PTRACCESSSEGVHANDLER_H 1

 
#include <signal.h>   /* siginfo_t */
#include <vector>
 
class PageAccessControl;
 
class PtrAccessSEGVHandler {
public:
  typedef std::vector<void*> accessed_t;
  typedef accessed_t::const_iterator const_iterator;
  const accessed_t& accessedPtrs() const { return m_accessed; }
  const_iterator beginAccessedPtrs() const { return m_accessed.begin(); }
  const_iterator endAccessedPtrs() const { return m_accessed.end(); }
  void reset() { m_accessed.clear(); }
  
  PtrAccessSEGVHandler(PageAccessControl& pac, size_t reservedSize=65535) :
    m_pac(pac) 
  {
    //we must reserve enough elements, or we risk vector allocating in a protected page during handle()...
    m_accessed.reserve(reservedSize);
  }

  void handle(int signal_number,siginfo_t *sigi,void *unused);
 
private:
  PageAccessControl& m_pac;
  accessed_t m_accessed;
};
#endif