-//$$CDS-header$$
+/*
+ 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_ELLEN_BINTREE_SET_RCU_H
#define CDSLIB_CONTAINER_ELLEN_BINTREE_SET_RCU_H
the priority value plus some uniformly distributed random value.
@warning Recall the tree is <b>unbalanced</b>. The complexity of operations is <tt>O(log N)</tt>
- for uniformly distributed random keys, but in worst case the complexity is <tt>O(N)</tt>.
+ for uniformly distributed random keys, but in the worst case the complexity is <tt>O(N)</tt>.
@note In the current implementation we do not use helping technique described in original paper.
So, the current implementation is near to fine-grained lock-based tree.
static CDS_CONSTEXPR const bool c_bExtractLockExternal = base_class::c_bExtractLockExternal; ///< Group of \p extract_xxx functions do not require external locking
- //@cond
- typedef cds::container::ellen_bintree::implementation_tag implementation_tag;
- //@endcond
-
protected:
//@cond
typedef typename maker::cxx_leaf_node_allocator cxx_leaf_node_allocator;
bool insert( Q const& val )
{
scoped_node_ptr sp( cxx_leaf_node_allocator().New( val ));
- if ( base_class::insert( *sp.get() )) {
+ if ( base_class::insert( *sp.get())) {
sp.release();
return true;
}
bool insert( Q const& val, Func f )
{
scoped_node_ptr sp( cxx_leaf_node_allocator().New( val ));
- if ( base_class::insert( *sp.get(), [&f]( leaf_node& val ) { f( val.m_Value ); } )) {
+ if ( base_class::insert( *sp.get(), [&f]( leaf_node& v ) { f( v.m_Value ); } )) {
sp.release();
return true;
}
return false;
}
- /// Ensures that the item exists in the set
+ /// Updates the node
/**
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:
+ If the item \p val is not found in the set, then \p val is inserted into the set
+ iff \p bAllowInsert is \p true.
+ Otherwise, the functor \p func is called with item found.
+ The functor \p func signature is:
\code
- struct my_functor {
- void operator()( bool bNew, value_type& item, const Q& val );
- };
+ void func( bool bNew, value_type& item, value_type& val );
\endcode
-
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 key passed into the \p ensure function
+ - \p val - argument \p val passed into the \p %update() function
- The functor may change non-key fields of the \p item; however, \p func must guarantee
+ 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.
- RCU \p synchronize() can be called. RCU should not be locked.
+ RCU \p synchronize method can be called. RCU should not be locked.
- 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 std::pair<bool, bool> where \p first is \p true if operation is successful,
+ i.e. the node has been inserted or updated,
+ \p second is \p true if new item has been added or \p false if the item with \p key
+ 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( Q const& val, Func func, bool bAllowInsert = true )
{
scoped_node_ptr sp( cxx_leaf_node_allocator().New( val ));
- std::pair<bool, bool> bRes = base_class::ensure( *sp,
- [&func, &val](bool bNew, leaf_node& node, leaf_node&){ func( bNew, node.m_Value, val ); });
+ std::pair<bool, bool> bRes = base_class::update( *sp,
+ [&func, &val](bool bNew, leaf_node& node, leaf_node&){ func( bNew, node.m_Value, val ); },
+ bAllowInsert );
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 \p args
/**
template <typename... Args>
bool emplace( Args&&... args )
{
- scoped_node_ptr sp( cxx_leaf_node_allocator().New( std::forward<Args>(args)... ));
- if ( base_class::insert( *sp.get() )) {
+ scoped_node_ptr sp( cxx_leaf_node_allocator().
MoveNew( std::forward<Args>(args)... ));
+ if ( base_class::insert( *sp.get())) {
sp.release();
return true;
}
{
CDS_UNUSED( pred );
return exempt_ptr( base_class::extract_with_( key,
- cds::details::predicate_wrapper< leaf_node, Less, typename maker::value_accessor >() ));
+ cds::details::predicate_wrapper< leaf_node, Less, typename maker::value_accessor >()));
}
/// Find the key \p key
}
//@endcond
- /// Find the key \p key
- /** @anchor cds_nonintrusive_EllenBinTreeSet_rcu_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.
-
The function applies RCU lock internally.
*/
template <typename Q>
+ bool contains( Q const& key ) const
+ {
+ return base_class::contains( key );
+ }
+ //@cond
+ template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
bool find( Q const& key ) const
{
- return base_class::find( key );
+ return contains( key );
}
+ //@endcond
- /// Finds the key \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_EllenBinTreeSet_rcu_find_val "find(Q const&)"
- but \p pred is used for key comparing.
- \p Less functor has the interface like \p std::less.
+ 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 and should meet \ref cds_intrusive_EllenBinTree_rcu_less
+ "Predicate requirements".
\p Less must imply the same element order as the comparator used for building the set.
+ \p pred should accept arguments of type \p Q, \p key_type, \p value_type in any combination.
*/
template <typename Q, typename Less>
- bool find_with( Q const& key, Less pred ) const
+ bool contains( Q const& key, Less pred ) const
{
CDS_UNUSED( pred );
- return base_class::find_with( key, cds::details::predicate_wrapper< leaf_node, Less, typename maker::value_accessor >());
+ return base_class::contains( key, cds::details::predicate_wrapper< leaf_node, Less, typename maker::value_accessor >());
+ }
+ //@cond
+ template <typename Q, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ bool find_with( Q const& key, Less pred ) const
+ {
+ return contains( key, pred );
}
+ //@endcond
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_EllenBinTreeSet_rcu_get
this sequence
\code
set.clear();
- assert( set.empty() );
+ assert( set.empty());
\endcode
the assertion could be raised.
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