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The Windows Access Control Model: Part 2

, 27 Jun 2005
This second part of the Access Control series will program with the basic Access Control structures.
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/*
 *
 * Copyright (c) 1998-2002
 * Dr John Maddock
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Dr John Maddock makes no representations
 * about the suitability of this software for any purpose.
 * It is provided "as is" without express or implied warranty.
 *
 */

 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE         regex_synch.hpp
  *   VERSION      see <boost/version.hpp>
  *   DESCRIPTION: Thread synchronisation for regex code.
  *                Note this is an internal header file included
  *                by regex.hpp, do not include on its own.
  */

#ifndef BOOST_REGEX_SYNCH_HPP
#define BOOST_REGEX_SYNCH_HPP

#ifndef BOOST_REGEX_CONFIG_HPP
#include <boost/regex/config.hpp>
#endif

#if defined(BOOST_HAS_THREADS)
#  if defined(BOOST_HAS_WINTHREADS)
#     include <windows.h>
#  elif defined(BOOST_HAS_BETHREADS)
#     include <OS.h>
#     include <cassert>
#  elif defined(BOOST_HAS_PTHREADS)
#     include <pthread.h>
#  else
#     error "Unknown threading API"
#  endif
#endif


namespace boost{
   namespace re_detail{

#ifdef __BORLANDC__
   #pragma option push -a8 -b -Vx -Ve -pc
#endif

void BOOST_REGEX_CALL re_init_threads();
void BOOST_REGEX_CALL re_free_threads();

#ifdef BOOST_HAS_THREADS

#  ifdef BOOST_HAS_BETHREADS

typedef sem_id CRITICAL_SECTION;

inline void BOOST_REGEX_CALL InitializeCriticalSection(CRITICAL_SECTION* ps)
{
    *ps = create_sem(1, "regex++");
    assert(*ps > 0);
}

inline void BOOST_REGEX_CALL DeleteCriticalSection(CRITICAL_SECTION* ps)
{
    int t = delete_sem(*ps);
    assert(t == B_NO_ERROR);
}

inline void BOOST_REGEX_CALL EnterCriticalSection(CRITICAL_SECTION* ps)
{
   status_t t = acquire_sem(*ps);
   assert(t == B_NO_ERROR);
}

inline void BOOST_REGEX_CALL LeaveCriticalSection(CRITICAL_SECTION* ps)
{
    status_t t = release_sem(*ps);
    assert(t == B_NO_ERROR);
}

#  elif defined(BOOST_HAS_PTHREADS)

typedef pthread_mutex_t CRITICAL_SECTION;

inline void BOOST_REGEX_CALL InitializeCriticalSection(CRITICAL_SECTION* ps)
{
   pthread_mutex_init(ps, 0);
}

inline void BOOST_REGEX_CALL DeleteCriticalSection(CRITICAL_SECTION* ps)
{
   pthread_mutex_destroy(ps);
}

inline void BOOST_REGEX_CALL EnterCriticalSection(CRITICAL_SECTION* ps)
{
   pthread_mutex_lock(ps);
}

inline void BOOST_REGEX_CALL LeaveCriticalSection(CRITICAL_SECTION* ps)
{
   pthread_mutex_unlock(ps);
}

#  elif !defined(BOOST_HAS_WINTHREADS)
#    error "Unknown threading API"
#  endif

template <class Lock>
class lock_guard
{
   typedef Lock lock_type;
public:
   lock_guard(lock_type& m, bool aq = true)
      : mut(m), owned(false){ acquire(aq); }

   ~lock_guard()
   { acquire(false); }

   void BOOST_REGEX_CALL acquire(bool aq = true)
   {
      if(aq && !owned)
      {
         mut.acquire(true);
         owned = true;
      }
      else if(!aq && owned)
      {
         mut.acquire(false);
         owned = false;
      }
   }
private:
   lock_type& mut;
   bool owned;
   // VC6 warning suppression:
   lock_guard& operator=(const lock_guard&);
};


class critical_section
{
public:
   critical_section()
   { InitializeCriticalSection(&hmutex);}

   critical_section(const critical_section&)
   { InitializeCriticalSection(&hmutex);}

   const critical_section& BOOST_REGEX_CALL operator=(const critical_section&)
   {return *this;}

   ~critical_section()
   {DeleteCriticalSection(&hmutex);}

private:

   void BOOST_REGEX_CALL acquire(bool aq)
   { if(aq) EnterCriticalSection(&hmutex);
      else LeaveCriticalSection(&hmutex);
   }

   CRITICAL_SECTION hmutex;

public:
   typedef lock_guard<critical_section> ro_guard;
   typedef lock_guard<critical_section> rw_guard;

   friend class lock_guard<critical_section>;
};

inline bool BOOST_REGEX_CALL operator==(const critical_section&, const critical_section&)
{
   return false;
}

inline bool BOOST_REGEX_CALL operator<(const critical_section&, const critical_section&)
{
   return true;
}

typedef lock_guard<critical_section> cs_guard;

BOOST_REGEX_DECL extern critical_section* p_re_lock;
BOOST_REGEX_DECL extern unsigned int re_lock_count;

#define BOOST_REGEX_GUARD(inst) boost::re_detail::critical_section::rw_guard g(inst);

#else  // BOOST_HAS_THREADS

#define BOOST_REGEX_GUARD(inst)

#endif // BOOST_HAS_THREADS

#ifdef __BORLANDC__
  #pragma option pop
#endif

} // namespace re_detail
} // namespace boost

#endif // sentry






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About the Author

oshah
Web Developer
United States United States
Mr. Shah is a reclusive C++/C# developer lurking somewhere in the depths of the city of London. He learnt physics at Kings' College London and obtained a Master in Science there. Having earned an MCAD, he teeters on the brink of transitioning from C++ to C#, unsure of which language to jump to. Fortunately, he also knows how to use .NET interop to merge code between the two languages (which means he won't have to make the choice anytime soon).
 
His interests (apart from programming) are walking, football (the real one!), philosophy, history, retro-gaming, strategy gaming, and any good game in general.
 
He maintains a website / blog / FAQ / junk at shexec32.serveftp.net, where he places the best answers he's written to the questions you've asked. If you can find him, maybe you can hire Mr. Shah to help you with anything C++[/CLI]/C#/.NET related Smile | :) .

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