-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
+
+ Source code repo: http://github.com/khizmax/libcds/
+ Download: http://sourceforge.net/projects/libcds/files/
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
#ifndef CDSLIB_CONTAINER_IMPL_SKIP_LIST_SET_H
#define CDSLIB_CONTAINER_IMPL_SKIP_LIST_SET_H
typedef typename traits::random_level_generator random_level_generator; ///< random level generator
typedef typename traits::stat stat; ///< internal statistics type
- //@cond
- typedef cds::container::skip_list::implementation_tag implementation_tag;
- //@endcond
+ static size_t const c_nHazardPtrCount = base_class::c_nHazardPtrCount; ///< Count of hazard pointer required for the skip-list
protected:
//@cond
{}
public:
+ ///@name Forward iterators (only for debugging purpose)
+ //@{
/// Iterator type
+ /**
+ The forward iterator has some features:
+ - it has no post-increment operator
+ - to protect the value, the iterator contains a GC-specific guard + another guard is required locally for increment operator.
+ For some GC (like as \p gc::HP), a guard is a limited resource per thread, so an exception (or assertion) "no free guard"
+ may be thrown if the limit of guard count per thread is exceeded.
+ - The iterator cannot be moved across thread boundary because it contains thread-private GC's guard.
+ - Iterator ensures thread-safety even if you delete the item the iterator points to. However, in case of concurrent
+ deleting operations there is no guarantee that you iterate all item in the list.
+ Moreover, a crash is possible when you try to iterate the next element that has been deleted by concurrent thread.
+
+ @warning Use this iterator on the concurrent container for debugging purpose only.
+
+ The iterator interface:
+ \code
+ class iterator {
+ public:
+ // Default constructor
+ iterator();
+
+ // Copy construtor
+ iterator( iterator const& src );
+
+ // Dereference operator
+ value_type * operator ->() const;
+
+ // Dereference operator
+ value_type& operator *() const;
+
+ // Preincrement operator
+ iterator& operator ++();
+
+ // Assignment operator
+ iterator& operator = (iterator const& src);
+
+ // Equality operators
+ bool operator ==(iterator const& i ) const;
+ bool operator !=(iterator const& i ) const;
+ };
+ \endcode
+ */
typedef skip_list::details::iterator< typename base_class::iterator > iterator;
/// Const iterator type
/// Returns a forward iterator addressing the first element in a set
iterator begin()
{
- return iterator( base_class::begin() );
+ return iterator( base_class::begin());
}
/// Returns a forward const iterator addressing the first element in a set
const_iterator begin() const
{
- return const_iterator( base_class::begin() );
+ return const_iterator( base_class::begin());
}
/// Returns a forward const iterator addressing the first element in a set
const_iterator cbegin() const
{
- return const_iterator( base_class::cbegin() );
+ return const_iterator( base_class::cbegin());
}
/// Returns a forward iterator that addresses the location succeeding the last element in a set.
iterator end()
{
- return iterator( base_class::end() );
+ return iterator( base_class::end());
}
/// Returns a forward const iterator that addresses the location succeeding the last element in a set.
const_iterator end() const
{
- return const_iterator( base_class::end() );
+ return const_iterator( base_class::end());
}
/// Returns a forward const iterator that addresses the location succeeding the last element in a set.
const_iterator cend() const
{
- return const_iterator( base_class::cend() );
+ return const_iterator( base_class::cend());
}
+ //@}
public:
/// Inserts new node
bool insert( Q const& val )
{
scoped_node_ptr sp( node_allocator().New( random_level(), val ));
- if ( base_class::insert( *sp.get() )) {
+ if ( base_class::insert( *sp.get())) {
sp.release();
return true;
}
return false;
}
- /// Ensures that the item exists in the set
+ /// Updates the item
/**
The operation performs inserting or changing data with lock-free manner.
If the \p val key not found in the set, then the new item created from \p val
- is inserted into the set. Otherwise, the functor \p func is called with the item found.
- The functor \p Func should be a function with signature:
- \code
- void func( bool bNew, value_type& item, const Q& val );
- \endcode
- or a functor:
+ will be inserted into the set iff \p bInsert is \p true.
+ Otherwise, if \p val is found, the functor \p func will be called with the item found.
+
+ The functor \p Func signature:
\code
struct my_functor {
void operator()( bool bNew, value_type& item, const Q& val );
};
\endcode
-
- with arguments:
+ where:
- \p bNew - \p true if the item has been inserted, \p false otherwise
- \p item - item of the set
- - \p val - argument \p key passed into the \p %ensure() function
+ - \p val - argument \p key passed into the \p %update() function
The functor may change non-key fields of the \p item; however, \p func must guarantee
that during changing no any other modifications could be made on this item by concurrent threads.
- Returns <tt> std::pair<bool, bool> </tt> where \p first is true if operation is successfull,
- \p second is true if new item has been added or \p false if the item with \p key
- already is in the set.
+ Returns <tt> std::pair<bool, bool> </tt> where \p first is \p true if operation is successful,
+ i.e. the item has been inserted or updated,
+ \p second is \p true if new item has been added or \p false if the item with key equal to \p val
+ already exists.
@warning See \ref cds_intrusive_item_creating "insert item troubleshooting"
*/
template <typename Q, typename Func>
- std::pair<bool, bool> ensure( const Q& val, Func func )
+ std::pair<bool, bool> update( const Q& val, Func func, bool bInsert = true )
{
scoped_node_ptr sp( node_allocator().New( random_level(), val ));
- std::pair<bool, bool> bRes = base_class::ensure( *sp,
- [&func, &val](bool bNew, node_type& node, node_type&){ func( bNew, node.m_Value, val ); });
+ std::pair<bool, bool> bRes = base_class::update( *sp,
+ [&func, &val](bool bNew, node_type& node, node_type&){ func( bNew, node.m_Value, val ); },
+ bInsert );
if ( bRes.first && bRes.second )
sp.release();
return bRes;
}
+ //@cond
+ template <typename Q, typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<bool, bool> ensure( const Q& val, Func func )
+ {
+ return update( val, func, true );
+ }
+ //@endcond
/// Inserts data of type \p value_type created in-place from <tt>std::forward<Args>(args)...</tt>
/**
bool emplace( Args&&... args )
{
scoped_node_ptr sp( node_allocator().New( random_level(), std::forward<Args>(args)... ));
- if ( base_class::insert( *sp.get() )) {
+ if ( base_class::insert( *sp.get())) {
sp.release();
return true;
}
bool erase_with( Q const& key, Less pred )
{
CDS_UNUSED( pred );
- return base_class::erase_with( key, cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor >() );
+ return base_class::erase_with( key, cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor >());
}
/// Delete \p key from the set
template <typename Q>
guarded_ptr extract( Q const& key )
{
- guarded_ptr gp;
- base_class::extract_( gp.guard(), key, typename base_class::key_comparator() );
- return gp;
+ return base_class::extract_( key, typename base_class::key_comparator());
}
/// Extracts the item from the set with comparing functor \p pred
{
CDS_UNUSED( pred );
typedef cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor > wrapped_less;
- guarded_ptr gp;
- base_class::extract_( gp.guard(), key, cds::opt::details::make_comparator_from_less<wrapped_less>() );
- return gp;
+ return base_class::extract_( key, cds::opt::details::make_comparator_from_less<wrapped_less>());
}
/// Extracts an item with minimal key from the set
*/
guarded_ptr extract_min()
{
- guarded_ptr gp;
- base_class::extract_min_( gp.guard() );
- return gp;
+ return base_class::extract_min_();
}
/// Extracts an item with maximal key from the set
*/
guarded_ptr extract_max()
{
- guarded_ptr gp;
- base_class::extract_max_( gp.guard() );
- return gp;
+ return base_class::extract_max_();
}
/// Find the \p key
{
CDS_UNUSED( pred );
return base_class::find_with( key, cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor >(),
- [&f]( node_type& node, Q& v ) { f( node.m_Value, v ); } );
+ [&f]( node_type& node, Q const& v ) { f( node.m_Value, v ); } );
}
//@endcond
- /// Find \p key
- /** \anchor cds_nonintrusive_SkipListSet_find_val
-
+ /// Checks whether the set contains \p key
+ /**
The function searches the item with key equal to \p key
and returns \p true if it is found, and \p false otherwise.
-
- Note the hash functor specified for class \p Traits template parameter
- should accept a parameter of type \p Q that may be not the same as \ref value_type.
*/
template <typename Q>
+ bool contains( Q const& key )
+ {
+ return base_class::contains( key );
+ }
+ //@cond
+ template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
bool find( Q const& key )
{
- return base_class::find( key );
+ return contains( key );
}
+ //@endcond
- /// Finds \p key using \p pred predicate for searching
+ /// Checks whether the set contains \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_nonintrusive_SkipListSet_find_val "find(Q const&)"
- but \p pred is used for key comparing.
+ The function is similar to <tt>contains( key )</tt> but \p pred is used for key comparing.
\p Less functor has the interface like \p std::less.
\p Less must imply the same element order as the comparator used for building the set.
*/
template <typename Q, typename Less>
- bool find_with( Q const& key, Less pred )
+ bool contains( Q const& key, Less pred )
{
CDS_UNUSED( pred );
- return base_class::find_with( key, cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor >());
+ return base_class::contains( key, cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor >());
}
+ //@cond
+ template <typename Q, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ bool find_with( Q const& key, Less pred )
+ {
+ return contains( key, pred );
+ }
+ //@endcond
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_SkipListSet_hp_get
template <typename Q>
guarded_ptr get( Q const& key )
{
- guarded_ptr gp;
- base_class::get_with_( gp.guard(), key, typename base_class::key_comparator() );
- return gp;
+ return base_class::get_with_( key, typename base_class::key_comparator());
}
/// Finds \p key and return the item found
{
CDS_UNUSED( pred );
typedef cds::details::predicate_wrapper< node_type, Less, typename maker::value_accessor > wrapped_less;
- guarded_ptr gp;
- base_class::get_with_( gp.guard(), key, cds::opt::details::make_comparator_from_less< wrapped_less >());
- return gp;
+ return base_class::get_with_( key, cds::opt::details::make_comparator_from_less< wrapped_less >());
}
/// Clears the set (not atomic).
this sequence
\code
set.clear();
- assert( set.empty() );
+ assert( set.empty());
\endcode
the assertion could be raised.
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