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 // Safe sequence/iterator base implementation  -*- C++ -*-

 // Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010
 // Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
 // terms of the GNU General Public License as published by the
 // Free Software Foundation; either version 3, or (at your option)
 // any later version.

 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 // GNU General Public License for more details.

 // Under Section 7 of GPL version 3, you are granted additional
 // permissions described in the GCC Runtime Library Exception, version
 // 3.1, as published by the Free Software Foundation.

 // You should have received a copy of the GNU General Public License and
 // a copy of the GCC Runtime Library Exception along with this program;
 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.

 /** @file debug/safe_base.h
  *  This file is a GNU debug extension to the Standard C++ Library.
  */

 #ifndef _GLIBCXX_DEBUG_SAFE_BASE_H
 #define _GLIBCXX_DEBUG_SAFE_BASE_H 1

 #include <ext/concurrence.h>

 namespace __gnu_debug
 {
   class _Safe_sequence_base;

   /** \brief Basic functionality for a @a safe iterator.
    *
    *  The %_Safe_iterator_base base class implements the functionality
    *  of a safe iterator that is not specific to a particular iterator
    *  type. It contains a pointer back to the sequence it references
    *  along with iterator version information and pointers to form a
    *  doubly-linked list of iterators referenced by the container.
    *
    *  This class must not perform any operations that can throw an
    *  exception, or the exception guarantees of derived iterators will
    *  be broken.
    */
   class _Safe_iterator_base
   {
   public:
     /** The sequence this iterator references; may be NULL to indicate
 	a singular iterator. */
     _Safe_sequence_base* _M_sequence;

     /** The version number of this iterator. The sentinel value 0 is
      *  used to indicate an invalidated iterator (i.e., one that is
      *  singular because of an operation on the container). This
      *  version number must equal the version number in the sequence
      *  referenced by _M_sequence for the iterator to be
      *  non-singular.
      */
     unsigned int         _M_version;

     /** Pointer to the previous iterator in the sequence's list of
 	iterators. Only valid when _M_sequence != NULL. */
     _Safe_iterator_base* _M_prior;

     /** Pointer to the next iterator in the sequence's list of
 	iterators. Only valid when _M_sequence != NULL. */
     _Safe_iterator_base* _M_next;

   protected:
     /** Initializes the iterator and makes it singular. */
     _Safe_iterator_base()
     : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
     { }

     /** Initialize the iterator to reference the sequence pointed to
      *  by @p__seq. @p __constant is true when we are initializing a
      *  constant iterator, and false if it is a mutable iterator. Note
      *  that @p __seq may be NULL, in which case the iterator will be
      *  singular. Otherwise, the iterator will reference @p __seq and
      *  be nonsingular.
      */
     _Safe_iterator_base(const _Safe_sequence_base* __seq, bool __constant)
     : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
     { this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); }

     /** Initializes the iterator to reference the same sequence that
 	@p __x does. @p __constant is true if this is a constant
 	iterator, and false if it is mutable. */
     _Safe_iterator_base(const _Safe_iterator_base& __x, bool __constant)
     : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
     { this->_M_attach(__x._M_sequence, __constant); }

     _Safe_iterator_base&
     operator=(const _Safe_iterator_base&);

     explicit
     _Safe_iterator_base(const _Safe_iterator_base&);

     ~_Safe_iterator_base() { this->_M_detach(); }

     /** For use in _Safe_iterator. */
     __gnu_cxx::__mutex& _M_get_mutex() throw ();

   public:
     /** Attaches this iterator to the given sequence, detaching it
      *	from whatever sequence it was attached to originally. If the
      *	new sequence is the NULL pointer, the iterator is left
      *	unattached.
      */
     void _M_attach(_Safe_sequence_base* __seq, bool __constant);

     /** Likewise, but not thread-safe. */
     void _M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw ();

     /** Detach the iterator for whatever sequence it is attached to,
      *	if any.
     */
     void _M_detach();

     /** Likewise, but not thread-safe. */
     void _M_detach_single() throw ();

     /** Determines if we are attached to the given sequence. */
     bool _M_attached_to(const _Safe_sequence_base* __seq) const
     { return _M_sequence == __seq; }

     /** Is this iterator singular? */
     _GLIBCXX_PURE bool _M_singular() const throw ();

     /** Can we compare this iterator to the given iterator @p __x?
 	Returns true if both iterators are nonsingular and reference
 	the same sequence. */
     _GLIBCXX_PURE bool _M_can_compare(const _Safe_iterator_base& __x) const throw ();

     /** Invalidate the iterator, making it singular. */
     void
     _M_invalidate()
     { _M_version = 0; }

     /** Reset all member variables */
     void
     _M_reset() throw ();

     /** Unlink itself */
     void
     _M_unlink() throw ()
     {
       if (_M_prior)
 	_M_prior->_M_next = _M_next;
       if (_M_next)
 	_M_next->_M_prior = _M_prior;
     }
   };

   /**
    * @brief Base class that supports tracking of iterators that
    * reference a sequence.
    *
    * The %_Safe_sequence_base class provides basic support for
    * tracking iterators into a sequence. Sequences that track
    * iterators must derived from %_Safe_sequence_base publicly, so
    * that safe iterators (which inherit _Safe_iterator_base) can
    * attach to them. This class contains two linked lists of
    * iterators, one for constant iterators and one for mutable
    * iterators, and a version number that allows very fast
    * invalidation of all iterators that reference the container.
    *
    * This class must ensure that no operation on it may throw an
    * exception, otherwise @a safe sequences may fail to provide the
    * exception-safety guarantees required by the C++ standard.
    */
   class _Safe_sequence_base
   {
   public:
     /// The list of mutable iterators that reference this container
     _Safe_iterator_base* _M_iterators;

     /// The list of constant iterators that reference this container
     _Safe_iterator_base* _M_const_iterators;

     /// The container version number. This number may never be 0.
     mutable unsigned int _M_version;

   protected:
     // Initialize with a version number of 1 and no iterators
     _Safe_sequence_base()
     : _M_iterators(0), _M_const_iterators(0), _M_version(1)
     { }

     /** Notify all iterators that reference this sequence that the
 	sequence is being destroyed. */
     ~_Safe_sequence_base()
     { this->_M_detach_all(); }

     /** Detach all iterators, leaving them singular. */
     void
     _M_detach_all();

     /** Detach all singular iterators.
      *  @post for all iterators i attached to this sequence,
      *   i->_M_version == _M_version.
      */
     void
     _M_detach_singular();

     /** Revalidates all attached singular iterators.  This method may
      *  be used to validate iterators that were invalidated before
      *  (but for some reason, such as an exception, need to become
      *  valid again).
      */
     void
     _M_revalidate_singular();

     /** Swap this sequence with the given sequence. This operation
      *  also swaps ownership of the iterators, so that when the
      *  operation is complete all iterators that originally referenced
      *  one container now reference the other container.
      */
     void
     _M_swap(_Safe_sequence_base& __x);

     /** For use in _Safe_sequence. */
     __gnu_cxx::__mutex& _M_get_mutex() throw ();

   public:
     /** Invalidates all iterators. */
     void
     _M_invalidate_all() const
     { if (++_M_version == 0) _M_version = 1; }

     /** Attach an iterator to this sequence. */
     void
     _M_attach(_Safe_iterator_base* __it, bool __constant);

     /** Likewise but not thread safe. */
     void
     _M_attach_single(_Safe_iterator_base* __it, bool __constant) throw ();

     /** Detach an iterator from this sequence */
     void
     _M_detach(_Safe_iterator_base* __it);

     /** Likewise but not thread safe. */
     void
     _M_detach_single(_Safe_iterator_base* __it) throw ();
   };
 } // namespace __gnu_debug

 #endif
	// Safe sequence/iterator base implementation -- C++ --

	// Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010
	// Free Software Foundation, Inc.
	//
	// This file is part of the GNU ISO C++ Library. This library is free
	// software; you can redistribute it and/or modify it under the
	// terms of the GNU General Public License as published by the
	// Free Software Foundation; either version 3, or (at your option)
	// any later version.

	// This library is distributed in the hope that it will be useful,
	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	// GNU General Public License for more details.

	// Under Section 7 of GPL version 3, you are granted additional
	// permissions described in the GCC Runtime Library Exception, version
	// 3.1, as published by the Free Software Foundation.

	// You should have received a copy of the GNU General Public License and
	// a copy of the GCC Runtime Library Exception along with this program;
	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	// <http://www.gnu.org/licenses/>.

	/** @file debug/safe_base.h
	* This file is a GNU debug extension to the Standard C++ Library.
	*/

	#ifndef _GLIBCXX_DEBUG_SAFE_BASE_H
	#define _GLIBCXX_DEBUG_SAFE_BASE_H 1

	#include <ext/concurrence.h>

	namespace __gnu_debug
	{
	class _Safe_sequence_base;

	/** \brief Basic functionality for a @a safe iterator.
	*
	* The %_Safe_iterator_base base class implements the functionality
	* of a safe iterator that is not specific to a particular iterator
	* type. It contains a pointer back to the sequence it references
	* along with iterator version information and pointers to form a
	* doubly-linked list of iterators referenced by the container.
	*
	* This class must not perform any operations that can throw an
	* exception, or the exception guarantees of derived iterators will
	* be broken.
	*/
	class _Safe_iterator_base
	{
	public:
	/** The sequence this iterator references; may be NULL to indicate
	a singular iterator. */
	_Safe_sequence_base* _M_sequence;

	/** The version number of this iterator. The sentinel value 0 is
	* used to indicate an invalidated iterator (i.e., one that is
	* singular because of an operation on the container). This
	* version number must equal the version number in the sequence
	* referenced by _M_sequence for the iterator to be
	* non-singular.
	*/
	unsigned int _M_version;

	/** Pointer to the previous iterator in the sequence's list of
	iterators. Only valid when _M_sequence != NULL. */
	_Safe_iterator_base* _M_prior;

	/** Pointer to the next iterator in the sequence's list of
	iterators. Only valid when _M_sequence != NULL. */
	_Safe_iterator_base* _M_next;

	protected:
	/** Initializes the iterator and makes it singular. */
	_Safe_iterator_base()
	: _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
	{ }

	/** Initialize the iterator to reference the sequence pointed to
	* by @p__seq. @p __constant is true when we are initializing a
	* constant iterator, and false if it is a mutable iterator. Note
	* that @p __seq may be NULL, in which case the iterator will be
	* singular. Otherwise, the iterator will reference @p __seq and
	* be nonsingular.
	*/
	_Safe_iterator_base(const _Safe_sequence_base* __seq, bool __constant)
	: _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
	{ this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); }

	/** Initializes the iterator to reference the same sequence that
	@p __x does. @p __constant is true if this is a constant
	iterator, and false if it is mutable. */
	_Safe_iterator_base(const _Safe_iterator_base& __x, bool __constant)
	: _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
	{ this->_M_attach(__x._M_sequence, __constant); }

	_Safe_iterator_base&
	operator=(const _Safe_iterator_base&);

	explicit
	_Safe_iterator_base(const _Safe_iterator_base&);

	~_Safe_iterator_base() { this->_M_detach(); }

	/** For use in _Safe_iterator. */
	__gnu_cxx::__mutex& _M_get_mutex() throw ();

	public:
	/** Attaches this iterator to the given sequence, detaching it
	* from whatever sequence it was attached to originally. If the
	* new sequence is the NULL pointer, the iterator is left
	* unattached.
	*/
	void _M_attach(_Safe_sequence_base* __seq, bool __constant);

	/** Likewise, but not thread-safe. */
	void _M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw ();

	/** Detach the iterator for whatever sequence it is attached to,
	* if any.
	*/
	void _M_detach();

	/** Likewise, but not thread-safe. */
	void _M_detach_single() throw ();

	/** Determines if we are attached to the given sequence. */
	bool _M_attached_to(const _Safe_sequence_base* __seq) const
	{ return _M_sequence == __seq; }

	/** Is this iterator singular? */
	_GLIBCXX_PURE bool _M_singular() const throw ();

	/** Can we compare this iterator to the given iterator @p __x?
	Returns true if both iterators are nonsingular and reference
	the same sequence. */
	_GLIBCXX_PURE bool _M_can_compare(const _Safe_iterator_base& __x) const throw ();

	/** Invalidate the iterator, making it singular. */
	void
	_M_invalidate()
	{ _M_version = 0; }

	/** Reset all member variables */
	void
	_M_reset() throw ();

	/** Unlink itself */
	void
	_M_unlink() throw ()
	{
	if (_M_prior)
	_M_prior->_M_next = _M_next;
	if (_M_next)
	_M_next->_M_prior = _M_prior;
	}
	};

	/**
	* @brief Base class that supports tracking of iterators that
	* reference a sequence.
	*
	* The %_Safe_sequence_base class provides basic support for
	* tracking iterators into a sequence. Sequences that track
	* iterators must derived from %_Safe_sequence_base publicly, so
	* that safe iterators (which inherit _Safe_iterator_base) can
	* attach to them. This class contains two linked lists of
	* iterators, one for constant iterators and one for mutable
	* iterators, and a version number that allows very fast
	* invalidation of all iterators that reference the container.
	*
	* This class must ensure that no operation on it may throw an
	* exception, otherwise @a safe sequences may fail to provide the
	* exception-safety guarantees required by the C++ standard.
	*/
	class _Safe_sequence_base
	{
	public:
	/// The list of mutable iterators that reference this container
	_Safe_iterator_base* _M_iterators;

	/// The list of constant iterators that reference this container
	_Safe_iterator_base* _M_const_iterators;

	/// The container version number. This number may never be 0.
	mutable unsigned int _M_version;

	protected:
	// Initialize with a version number of 1 and no iterators
	_Safe_sequence_base()
	: _M_iterators(0), _M_const_iterators(0), _M_version(1)
	{ }

	/** Notify all iterators that reference this sequence that the
	sequence is being destroyed. */
	~_Safe_sequence_base()
	{ this->_M_detach_all(); }

	/** Detach all iterators, leaving them singular. */
	void
	_M_detach_all();

	/** Detach all singular iterators.
	* @post for all iterators i attached to this sequence,
	* i->_M_version == _M_version.
	*/
	void
	_M_detach_singular();

	/** Revalidates all attached singular iterators. This method may
	* be used to validate iterators that were invalidated before
	* (but for some reason, such as an exception, need to become
	* valid again).
	*/
	void
	_M_revalidate_singular();

	/** Swap this sequence with the given sequence. This operation
	* also swaps ownership of the iterators, so that when the
	* operation is complete all iterators that originally referenced
	* one container now reference the other container.
	*/
	void
	_M_swap(_Safe_sequence_base& __x);

	/** For use in _Safe_sequence. */
	__gnu_cxx::__mutex& _M_get_mutex() throw ();

	public:
	/** Invalidates all iterators. */
	void
	_M_invalidate_all() const
	{ if (++_M_version == 0) _M_version = 1; }

	/** Attach an iterator to this sequence. */
	void
	_M_attach(_Safe_iterator_base* __it, bool __constant);

	/** Likewise but not thread safe. */
	void
	_M_attach_single(_Safe_iterator_base* __it, bool __constant) throw ();

	/** Detach an iterator from this sequence */
	void
	_M_detach(_Safe_iterator_base* __it);

	/** Likewise but not thread safe. */
	void
	_M_detach_single(_Safe_iterator_base* __it) throw ();
	};
	} // namespace __gnu_debug

	#endif