-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
-#ifndef __CDS_INTRUSIVE_SKIP_LIST_NOGC_H
-#define __CDS_INTRUSIVE_SKIP_LIST_NOGC_H
+ (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_INTRUSIVE_SKIP_LIST_NOGC_H
+#define CDSLIB_INTRUSIVE_SKIP_LIST_NOGC_H
#include <type_traits>
#include <memory>
/// Access to element of next pointer array
atomic_ptr& next( unsigned int nLevel )
{
- assert( nLevel < height() );
- assert( nLevel == 0 || (nLevel > 0 && m_arrNext != nullptr) );
+ assert( nLevel < height());
+ assert( nLevel == 0 || (nLevel > 0 && m_arrNext != nullptr));
return nLevel ? m_arrNext[ nLevel - 1] : m_pNext;
}
/// Access to element of next pointer array (const version)
atomic_ptr const& next( unsigned int nLevel ) const
{
- assert( nLevel < height() );
+ assert( nLevel < height());
assert( nLevel == 0 || nLevel > 0 && m_arrNext != nullptr );
return nLevel ? m_arrNext[ nLevel - 1] : m_pNext;
public: // for internal use only!!!
iterator( node_type& refHead )
- : m_pNode( refHead[0].load( atomics::memory_order_relaxed ) )
+ : m_pNode( refHead[0].load( atomics::memory_order_relaxed ))
{}
static iterator from_node( node_type * pNode )
- \p T - type to be stored in the set. The type must be based on \p skip_list::node (for \p skip_list::base_hook)
or it must have a member of type \p skip_list::node (for \p skip_list::member_hook).
- \p Traits - type traits, default is \p skip_list::traits.
- It is possible to declare option-based list with \p cds::intrusive::skip_list::make_traits metafunction
+ It is possible to declare option-based list with \p cds::intrusive::skip_list::make_traits metafunction
istead of \p Traits template argument.
<b>Iterators</b>
protected:
head_node m_Head; ///< head tower (max height)
- item_counter m_ItemCounter; ///< item counter
random_level_generator m_RandomLevelGen; ///< random level generator instance
atomics::atomic<unsigned int> m_nHeight; ///< estimated high level
+ item_counter m_ItemCounter; ///< item counter
mutable stat m_Stat; ///< internal statistics
protected:
{
node_type * p = pos.pSucc[0];
pNode->next( 0 ).store( pos.pSucc[ 0 ], memory_model::memory_order_release );
- if ( !pos.pPrev[0]->next(0).compare_exchange_strong( p, pNode, memory_model::memory_order_release, memory_model::memory_order_relaxed ) ) {
+ if ( !pos.pPrev[0]->next(0).compare_exchange_strong( p, pNode, memory_model::memory_order_release, memory_model::memory_order_relaxed )) {
return false;
}
f( val );
if ( pNode->next( nLevel ).compare_exchange_strong( p, q, memory_model::memory_order_release, memory_model::memory_order_relaxed )) {
p = q;
- if ( pos.pPrev[nLevel]->next(nLevel).compare_exchange_strong( q, pNode, memory_model::memory_order_release, memory_model::memory_order_relaxed ) )
+ if ( pos.pPrev[nLevel]->next(nLevel).compare_exchange_strong( q, pNode, memory_model::memory_order_release, memory_model::memory_order_relaxed ))
break;
}
void increase_height( unsigned int nHeight )
{
unsigned int nCur = m_nHeight.load( memory_model::memory_order_relaxed );
- while ( nCur < nHeight && !m_nHeight.compare_exchange_weak( nCur, nHeight, memory_model::memory_order_acquire, atomics::memory_order_relaxed ) );
+ while ( nCur < nHeight && !m_nHeight.compare_exchange_weak( nCur, nHeight, memory_model::memory_order_acquire, atomics::memory_order_relaxed ));
}
//@endcond
}
public:
- /// Iterator type
+ ///@name Forward iterators
+ //@{
+ /// Forward iterator
+ /**
+ The forward iterator for a split-list has some features:
+ - it has no post-increment operator
+ - it depends on iterator of underlying \p OrderedList
+ */
typedef skip_list::details::iterator< gc, node_traits, back_off, false > iterator;
/// Const iterator type
/// Returns a forward iterator addressing the first element in a set
iterator begin()
{
- return iterator( *m_Head.head() );
+ return iterator( *m_Head.head());
}
/// Returns a forward const iterator addressing the first element in a set
const_iterator begin() const
{
- return const_iterator( *m_Head.head() );
+ return const_iterator( *m_Head.head());
}
/// Returns a forward const iterator addressing the first element in a set
const_iterator cbegin() const
{
- return const_iterator( *m_Head.head() );
+ return const_iterator( *m_Head.head());
}
/// Returns a forward iterator that addresses the location succeeding the last element in a set.
{
return const_iterator();
}
+ //@}
protected:
//@cond
}
}
- /// Ensures that the \p val exists in the set
+ /// Updates the node
/**
The operation performs inserting or changing data with lock-free manner.
- If the item \p val is not found in the set, then \p val is inserted into the set.
+ If the item \p val is not found in the set, then \p val is inserted into the set
+ iff \p bInsert is \p true.
Otherwise, the functor \p func is called with item found.
The functor signature is:
\code
with arguments:
- \p bNew - \p true if the item has been inserted, \p false otherwise
- \p item - item of the set
- - \p val - argument \p val passed into the \p ensure function
+ - \p val - argument \p val passed into the \p %update() function
If new item has been inserted (i.e. \p bNew is \p true) then \p item and \p val arguments
refer to the same thing.
The functor can 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 std::pair<bool, bool> where \p first is \p true if operation is successfull,
+ Returns std::pair<bool, bool> where \p first is \p true if operation is successful,
\p second is \p true if new item has been added or \p false if the item with \p key
already is in the set.
@warning See \ref cds_intrusive_item_creating "insert item troubleshooting"
*/
template <typename Func>
- std::pair<bool, bool> ensure( value_type& val, Func func )
+ std::pair<bool, bool> update( value_type& val, Func func, bool bInsert = true )
{
node_type * pNode = node_traits::to_node_ptr( val );
scoped_node_ptr scp( pNode );
scp.release();
func( false, *node_traits::to_value_ptr(pos.pCur), val );
- m_Stat.onEnsureExist();
+ m_Stat.onUpdateExist();
return std::make_pair( true, false );
}
+ if ( !bInsert ) {
+ scp.release();
+ return std::make_pair( false, false );
+ }
+
if ( !bTowerOk ) {
build_node( pNode );
nHeight = pNode->height();
++m_ItemCounter;
scp.release();
m_Stat.onAddNode( nHeight );
- m_Stat.onEnsureNew();
+ m_Stat.onUpdateNew();
return std::make_pair( true, true );
}
}
+ //@cond
+ template <typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<bool, bool> ensure( value_type& val, Func func )
+ {
+ return update( val, func, true );
+ }
+ //@endcond
/// Finds \p key
/** \anchor cds_intrusive_SkipListSet_nogc_find_func
}
//@endcond
- /// Finds \p key
- /** \anchor cds_intrusive_SkipListSet_nogc_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 can be not the same as \p value_type.
+ and returns pointer to item found or \p nullptr.
*/
template <typename Q>
- value_type * find( Q const& key ) const
+ value_type * contains( Q const& key ) const
{
node_type * pNode = find_with_( key, key_comparator(), [](value_type& , Q const& ) {} );
if ( pNode )
return node_traits::to_value_ptr( pNode );
return nullptr;
}
+ //@cond
+ template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
+ value_type * find( Q const& key ) const
+ {
+ return contains( key );
+ }
+ //@endcond
- /// Finds \p key using \p pred predicate for comparing
+ /// Checks whether the set contains \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_intrusive_SkipListSet_nogc_find_val "find(Q const&)"
- but \p pred predicate is used for key compare.
- \p Less has the interface like \p std::less.
- \p pred must imply the same element order as the comparator used for building the set.
+ 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>
- value_type * find_with( Q const& key, Less pred ) const
+ value_type * contains( Q const& key, Less pred ) const
{
CDS_UNUSED( pred );
node_type * pNode = find_with_( key, cds::opt::details::make_comparator_from_less<Less>(), [](value_type& , Q const& ) {} );
return node_traits::to_value_ptr( pNode );
return nullptr;
}
+ //@cond
+ template <typename Q, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ value_type * find_with( Q const& key, Less pred ) const
+ {
+ return contains( key, pred );
+ }
+ //@endcond
/// Gets minimum key from the set
/**
}} // namespace cds::intrusive
-#endif // #ifndef __CDS_INTRUSIVE_SKIP_LIST_IMPL_H
+#endif // #ifndef CDSLIB_INTRUSIVE_SKIP_LIST_IMPL_H
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