-//$$CDS-header$$
+/*
+ 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_INTRUSIVE_MICHAEL_LIST_NOGC_H
#define CDSLIB_INTRUSIVE_MICHAEL_LIST_NOGC_H
#include <cds/gc/nogc.h>
#include <cds/details/make_const_type.h>
-
namespace cds { namespace intrusive {
namespace michael_list {
typedef typename get_node_traits< value_type, node_type, hook>::type node_traits ; ///< node traits
typedef typename michael_list::get_link_checker< node_type, traits::link_checker >::type link_checker; ///< link checker
- typedef typename traits::back_off back_off; ///< back-off strategy
- typedef typename traits::item_counter item_counter; ///< Item counting policy used
- typedef typename traits::memory_model memory_model; ///< Memory ordering. See cds::opt::memory_model option
+ typedef typename traits::back_off back_off; ///< back-off strategy
+ typedef typename traits::item_counter item_counter; ///< Item counting policy used
+ typedef typename traits::memory_model memory_model; ///< Memory ordering. See cds::opt::memory_model option
+ typedef typename traits::stat stat; ///< Internal statistics
//@cond
+ static_assert((std::is_same< gc, typename node_type::gc >::value), "GC and node_type::gc must be the same type");
+
// Rebind traits (split-list support)
template <typename... Options>
struct rebind_traits {
, typename cds::opt::make_options< traits, Options...>::type
> type;
};
+
+ // Stat selector
+ template <typename Stat>
+ using select_stat_wrapper = michael_list::select_stat_wrapper< Stat >;
//@endcond
protected:
atomic_node_ptr m_pHead; ///< Head pointer
item_counter m_ItemCounter; ///< Item counter
+ stat m_Stat; ///< Internal statistics
//@cond
/// Position pointer for item search
link_checker::is_empty( pNode );
pNode->m_pNext.store( pos.pCur, memory_model::memory_order_relaxed );
- return pos.pPrev->compare_exchange_strong( pos.pCur, pNode, memory_model::memory_order_release, atomics::memory_order_relaxed );
+ if ( cds_likely( pos.pPrev->compare_exchange_strong( pos.pCur, pNode, memory_model::memory_order_release, atomics::memory_order_relaxed )))
+ return true;
+
+ pNode->m_pNext.store( nullptr, memory_model::memory_order_relaxed );
+ return false;
}
//@endcond
*/
iterator begin()
{
- return iterator(m_pHead.load(memory_model::memory_order_relaxed) );
+ return iterator(m_pHead.load(memory_model::memory_order_relaxed));
}
/// Returns an iterator that addresses the location succeeding the last element in a list
/// Returns a forward const iterator addressing the first element in a list
const_iterator begin() const
{
- return const_iterator(m_pHead.load(memory_model::memory_order_relaxed) );
+ return const_iterator(m_pHead.load(memory_model::memory_order_relaxed));
}
/// Returns a forward const iterator addressing the first element in a list
const_iterator cbegin() const
{
- return const_iterator(m_pHead.load(memory_model::memory_order_relaxed) );
+ return const_iterator(m_pHead.load(memory_model::memory_order_relaxed));
}
/// Returns an const iterator that addresses the location succeeding the last element in a list
/// Default constructor initializes empty list
MichaelList()
: m_pHead( nullptr )
- {
- static_assert( (std::is_same< gc, typename node_type::gc >::value), "GC and node_type::gc must be the same type" );
- }
+ {}
+
+ //@cond
+ template <typename Stat, typename = std::enable_if<std::is_same<stat, michael_list::wrapped_stat<Stat>>::value >>
+ explicit MichaelList( Stat& st )
+ : m_pHead( nullptr )
+ , m_Stat( st )
+ {}
+ //@endcond
/// Destroys the list objects
~MichaelList()
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 \p true if operation is successfull,
+ Returns <tt> std::pair<bool, bool> </tt> 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 list.
*/
return update_at( m_pHead, val, func, bAllowInsert );
}
//@cond
- // Deprecated, use update()
template <typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
std::pair<bool, bool> ensure( value_type& val, Func func )
{
return update( val, func );
template <typename Q>
value_type * contains( Q const& key )
{
- return find_at( m_pHead, key, key_comparator() );
+ return find_at( m_pHead, key, key_comparator());
}
//@cond
- // Deprecated, use contains()
template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
value_type * find( Q const& key )
{
return contains( key );
return find_at( m_pHead, key, cds::opt::details::make_comparator_from_less<Less>());
}
//@cond
- // Deprecated, use contains()
template <typename Q, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
value_type * find_with( Q const& key, Less pred )
{
return contains( key, pred );
void clear( Disposer disp )
{
node_type * pHead = m_pHead.load(memory_model::memory_order_relaxed);
- do {} while ( !m_pHead.compare_exchange_weak( pHead, nullptr, memory_model::memory_order_relaxed ) );
+ do {} while ( cds_unlikely( !m_pHead.compare_exchange_weak( pHead, nullptr, memory_model::memory_order_relaxed )));
while ( pHead ) {
node_type * p = pHead->m_pNext.load(memory_model::memory_order_relaxed);
*/
void clear()
{
- clear( disposer() );
+ clear( disposer());
}
/// Checks if the list is empty
return m_ItemCounter.value();
}
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return m_Stat;
+ }
+
protected:
//@cond
// split-list support
// Hack: convert node_type to value_type.
// In principle, auxiliary node can be non-reducible to value_type
// We assume that comparator can correctly distinguish aux and regular node.
- return insert_at( refHead, *node_traits::to_value_ptr( pNode ) );
+ return insert_at( refHead, *node_traits::to_value_ptr( pNode ));
}
bool insert_at( atomic_node_ptr& refHead, value_type& val )
{
- link_checker::is_empty( node_traits::to_node_ptr( val ) );
position pos;
while ( true ) {
- if ( search( refHead, val, key_comparator(), pos ) )
+ if ( search( refHead, val, key_comparator(), pos )) {
+ m_Stat.onInsertFailed();
return false;
+ }
- if ( link_node( node_traits::to_node_ptr( val ), pos ) ) {
+ if ( link_node( node_traits::to_node_ptr( val ), pos )) {
++m_ItemCounter;
+ m_Stat.onInsertSuccess();
return true;
}
+
+ m_Stat.onInsertRetry();
}
}
position pos;
while ( true ) {
- if ( search( refHead, val, key_comparator(), pos ) ) {
- assert( key_comparator()( val, *node_traits::to_value_ptr( *pos.pCur ) ) == 0 );
+ if ( search( refHead, val, key_comparator(), pos )) {
+ assert( key_comparator()( val, *node_traits::to_value_ptr( *pos.pCur )) == 0 );
func( false, *node_traits::to_value_ptr( *pos.pCur ) , val );
+ m_Stat.onUpdateExisting();
return std::make_pair( iterator( pos.pCur ), false );
}
else {
- if ( !bAllowInsert )
+ if ( !bAllowInsert ) {
+ m_Stat.onUpdateFailed();
return std::make_pair( end(), false );
+ }
- link_checker::is_empty( node_traits::to_node_ptr( val ) );
-
- if ( link_node( node_traits::to_node_ptr( val ), pos ) ) {
+ if ( link_node( node_traits::to_node_ptr( val ), pos )) {
++m_ItemCounter;
func( true, val , val );
+ m_Stat.onUpdateNew();
return std::make_pair( iterator( node_traits::to_node_ptr( val )), true );
}
}
+
+ m_Stat.onUpdateRetry();
}
}
{
position pos;
- if ( search( refHead, val, cmp, pos ) ) {
+ if ( search( refHead, val, cmp, pos )) {
assert( pos.pCur != nullptr );
f( *node_traits::to_value_ptr( *pos.pCur ), val );
+ m_Stat.onFindSuccess();
return true;
}
+
+ m_Stat.onFindFailed();
return false;
}
value_type * find_at( atomic_node_ptr& refHead, Q const& val, Compare cmp )
{
iterator it = find_at_( refHead, val, cmp );
- if ( it != end() )
+ if ( it != end()) {
+ m_Stat.onFindSuccess();
return &*it;
+ }
+
+ m_Stat.onFindFailed();
return nullptr;
}
{
position pos;
- if ( search( refHead, val, cmp, pos ) ) {
+ if ( search( refHead, val, cmp, pos )) {
assert( pos.pCur != nullptr );
+ m_Stat.onFindSuccess();
return iterator( pos.pCur );
}
+
+ m_Stat.onFindFailed();
return end();
}
}
pNext = pCur->m_pNext.load(memory_model::memory_order_relaxed);
- if ( pCur->m_pNext.load(memory_model::memory_order_acquire) != pNext ) {
+ if ( cds_unlikely( pCur->m_pNext.load(memory_model::memory_order_acquire) != pNext )) {
bkoff();
goto try_again;
}
- if ( pPrev->load(memory_model::memory_order_acquire) != pCur ) {
+ if ( cds_unlikely( pPrev->load(memory_model::memory_order_acquire) != pCur )) {
bkoff();
goto try_again;
}
pCur = pNext;
}
}
+
+ // for split-list
+ template <typename Predicate>
+ void erase_for( Predicate pred )
+ {
+ node_type * pPred = nullptr;
+ node_type * pHead = m_pHead.load( memory_model::memory_order_relaxed );
+ while ( pHead ) {
+ node_type * p = pHead->m_pNext.load( memory_model::memory_order_relaxed );
+ if ( pred( *node_traits::to_value_ptr( pHead ))) {
+ assert( pPred != nullptr );
+ pPred->m_pNext.store( p, memory_model::memory_order_relaxed );
+ dispose_node( pHead, disposer());
+ }
+ else
+ pPred = pHead;
+ pHead = p;
+ }
+ }
//@endcond
};
projects / libcds.git / blobdiff