-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
+
+ 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_LAZY_LIST_RCU_H
#define CDSLIB_INTRUSIVE_LAZY_LIST_RCU_H
}
};
- class auto_lock_position {
- position& m_pos;
- public:
- auto_lock_position( position& pos )
- : m_pos(pos)
- {
- pos.lock();
- }
- ~auto_lock_position()
- {
- m_pos.unlock();
- }
- };
+ typedef std::unique_lock< position > scoped_position_lock;
- typedef cds::urcu::details::check_deadlock_policy< gc, rcu_check_deadlock> check_deadlock_policy;
+ typedef cds::urcu::details::check_deadlock_policy< gc, rcu_check_deadlock> deadlock_policy;
//@endcond
protected:
static void dispose_node( node_type * pNode )
{
assert( pNode );
- assert( !gc::is_locked() );
+ assert( !gc::is_locked());
- gc::template retire_ptr<clear_and_dispose>( node_traits::to_value_ptr( *pNode ) );
+ gc::template retire_ptr<clear_and_dispose>( node_traits::to_value_ptr( *pNode ));
}
- void link_node( node_type * pNode, node_type * pPred, node_type * pCur )
+ static void link_node( node_type * pNode, node_type * pPred, node_type * pCur )
{
assert( pPred->m_pNext.load(memory_model::memory_order_relaxed).ptr() == pCur );
+ link_checker::is_empty( pNode );
- pNode->m_pNext.store( marked_node_ptr(pCur), memory_model::memory_order_release );
+ pNode->m_pNext.store( marked_node_ptr(pCur), memory_model::memory_order_relaxed );
pPred->m_pNext.store( marked_node_ptr(pNode), memory_model::memory_order_release );
}
node_type * pNext = pCur->m_pNext.load(memory_model::memory_order_relaxed).ptr();
pCur->m_pNext.store( marked_node_ptr( pHead, 1 ), memory_model::memory_order_relaxed ); // logical deletion + back-link for search
- pPred->m_pNext.store( marked_node_ptr( pNext ), memory_model::memory_order_relaxed); // physically deleting
+ pPred->m_pNext.store( marked_node_ptr( pNext ), memory_model::memory_order_release); // physically deleting
}
//@endcond
public:
/// pointer to extracted node
using exempt_ptr = cds::urcu::exempt_ptr< gc, value_type, value_type, clear_and_dispose, void >;
+ /// Type of \p get() member function return value
+ typedef value_type * raw_ptr;
protected:
//@cond
assert( m_pNode != nullptr );
node_type * pNode = node_traits::to_node_ptr( m_pNode );
- node_type * pNext = pNode->m_pNext.load(memory_model::memory_order_relaxed).ptr();
+ node_type * pNext = pNode->m_pNext.load(memory_model::memory_order_acquire).ptr();
if ( pNext != nullptr )
m_pNode = node_traits::to_value_ptr( pNext );
}
node_type * pNode = node_traits::to_node_ptr( m_pNode );
// Dummy tail node could not be marked
- while ( pNode->is_marked() )
- pNode = pNode->m_pNext.load(memory_model::memory_order_relaxed).ptr();
+ while ( pNode->is_marked())
+ pNode = pNode->m_pNext.load(memory_model::memory_order_acquire).ptr();
- if ( pNode != node_traits::to_node_ptr( m_pNode ) )
+ if ( pNode != node_traits::to_node_ptr( m_pNode ))
m_pNode = node_traits::to_value_ptr( pNode );
}
}
//@endcond
public:
+ ///@name Forward iterators (thread-safe only under RCU lock)
+ //@{
/// Forward iterator
+ /**
+ You may safely use iterators in multi-threaded environment only under RCU lock.
+ Otherwise, a crash is possible if another thread deletes the item the iterator points to.
+ */
typedef iterator_type<false> iterator;
+
/// Const forward iterator
typedef iterator_type<true> const_iterator;
}
/// Returns a forward const iterator addressing the first element in a list
- //@{
const_iterator begin() const
{
return get_const_begin();
}
+
+ /// Returns a forward const iterator addressing the first element in a list
const_iterator cbegin() const
{
return get_const_begin();
}
- //@}
/// Returns an const iterator that addresses the location succeeding the last element in a list
- //@{
const_iterator end() const
{
return get_const_end();
}
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a list
const_iterator cend() const
{
return get_const_end();
}
- //@}
+ //@}
private:
//@cond
return insert_at( &m_Head, val, f );
}
- /// Ensures that the \p item exists in the list
+ /// Updates the item
/**
The operation performs inserting or changing data with lock-free manner.
- If the item \p val not found in the list, then \p val is inserted into the list.
+ If the item \p val not found in the list, then \p val is inserted into the list
+ iff \p bAllowInsert 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 list
- - \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
- refers to the same thing.
+ refer to the same thing.
The functor may change non-key fields of the \p item.
While the functor \p f is calling the item \p item is 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
+ 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.
- */
+ The function makes RCU lock internally.
+ */
template <typename Func>
+ std::pair<bool, bool> update( value_type& val, Func func, bool bAllowInsert = true )
+ {
+ return update_at( &m_Head, val, func, bAllowInsert );
+ }
+ //@cond
+ template <typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
std::pair<bool, bool> ensure( value_type& val, Func func )
{
- return ensure_at( &m_Head, val, func );
+ return update( val, func, true );
}
+ //@endcond
/// Unlinks the item \p val from the list
/**
The function searches the item \p val in the list and unlink it from the list
if it is found and it is equal to \p val.
- Difference between \ref erase and \p unlink functions: \p erase finds <i>a key</i>
- and deletes the item found. \p unlink finds an item by key and deletes it
+ Difference between \p erase() and \p %unlink() functions: \p %erase() finds <i>a key</i>
+ and deletes the item found. \p %unlink() finds an item by key and deletes it
only if \p val is an item of that list, i.e. the pointer to item found
is equal to <tt> &val </tt>.
The function returns \p true if success and \p false otherwise.
- RCU \p synchronize method can be called.
+ RCU \p synchronize method can be called. The RCU should not be locked.
Note that depending on RCU type used the \ref disposer call can be deferred.
- The function can throw cds::urcu::rcu_deadlock exception if deadlock is encountered and
- deadlock checking policy is opt::v::rcu_throw_deadlock.
+ \p disposer specified in \p Traits is called for unlinked item.
+
+ The function can throw \p cds::urcu::rcu_deadlock exception if deadlock is encountered and
+ deadlock checking policy is \p opt::v::rcu_throw_deadlock.
*/
bool unlink( value_type& val )
{
}
/// Deletes the item from the list
- /** \anchor cds_intrusive_LazyList_rcu_find_erase
+ /**
The function searches an item with key equal to \p key in the list,
unlinks it from the list, and returns \p true.
If the item with the key equal to \p key is not found the function return \p false.
- RCU \p synchronize method can be called.
+ RCU \p synchronize method can be called. The RCU should not be locked.
Note that depending on RCU type used the \ref disposer call can be deferred.
+ \p disposer specified in \p Traits is called for deleted item.
+
The function can throw \ref cds_urcu_rcu_deadlock "cds::urcu::rcu_deadlock" exception if deadlock is encountered and
- deadlock checking policy is opt::v::rcu_throw_deadlock.
+ deadlock checking policy is \p opt::v::rcu_throw_deadlock.
*/
template <typename Q>
bool erase( Q const& key )
{
- return erase_at( &m_Head, key, key_comparator() );
+ return erase_at( &m_Head, key, key_comparator());
}
/// Deletes the item from the list using \p pred predicate for searching
/**
- The function is an analog of \ref cds_intrusive_LazyList_rcu_find_erase "erase(Q const&)"
+ The function is an analog of \p erase(Q const&)
but \p pred is used for key comparing.
\p Less functor has the interface like \p std::less.
\p pred must imply the same element order as the comparator used for building the list.
+
+ \p disposer specified in \p Traits is called for deleted item.
*/
template <typename Q, typename Less>
bool erase_with( Q const& key, Less pred )
}
/// Deletes the item from the list
- /** \anchor cds_intrusive_LazyList_rcu_find_erase_func
+ /**
The function searches an item with key equal to \p key in the list,
call \p func functor with item found, unlinks it from the list, and returns \p true.
The \p Func interface is
If the item with the key equal to \p key is not found the function return \p false.
- RCU \p synchronize method can be called.
+ RCU \p synchronize method can be called. The RCU should not be locked.
Note that depending on RCU type used the \ref disposer call can be deferred.
+ \p disposer specified in \p Traits is called for deleted item.
+
The function can throw \ref cds_urcu_rcu_deadlock "cds::urcu::rcu_deadlock" exception if deadlock is encountered and
- deadlock checking policy is opt::v::rcu_throw_deadlock.
+ deadlock checking policy is \p opt::v::rcu_throw_deadlock.
*/
template <typename Q, typename Func>
bool erase( Q const& key, Func func )
/// Deletes the item from the list using \p pred predicate for searching
/**
- The function is an analog of \ref cds_intrusive_LazyList_rcu_find_erase_func "erase(Q const&, Func)"
+ The function is an analog of \p erase(Q const&, Func)
but \p pred is used for key comparing.
\p Less functor has the interface like \p std::less.
\p pred must imply the same element order as the comparator used for building the list.
+
+ \p disposer specified in \p Traits is called for deleted item.
*/
template <typename Q, typename Less, typename Func>
bool erase_with( Q const& key, Less pred, Func func )
/// Extracts an item from the list
/**
- \anchor cds_intrusive_LazyList_rcu_extract
The function searches an item with key equal to \p key in the list,
unlinks it from the list, and returns \ref cds::urcu::exempt_ptr "exempt_ptr" pointer to an item found.
If the item is not found the function returns empty \p exempt_ptr.
@note The function does NOT call RCU read-side lock or synchronization,
- and does NOT dispose the item found. It just excludes the item from the list
+ and does NOT dispose the item found. It just unlinks the item from the list
and returns a pointer to it.
- You should manually lock RCU before calling this function, and you should manually synchronize RCU
- outside the RCU lock region before reusing returned pointer.
+ You should manually lock RCU before calling this function, and you should manually release
+ the returned exempt pointer outside the RCU lock region before reusing returned pointer.
\code
#include <cds/urcu/general_buffered.h>
template <typename Q>
exempt_ptr extract( Q const& key )
{
- return exempt_ptr( extract_at( &m_Head, key, key_comparator() ));
+ return exempt_ptr( extract_at( &m_Head, key, key_comparator()));
}
/// Extracts an item from the list using \p pred predicate for searching
exempt_ptr extract_with( Q const& key, Less pred )
{
CDS_UNUSED( pred );
- return exempt_ptr( extract_at( &m_Head, key, cds::opt::details::make_comparator_from_less<Less>() ));
+ return exempt_ptr( extract_at( &m_Head, key, cds::opt::details::make_comparator_from_less<Less>()));
}
/// Finds the key \p key
- /** \anchor cds_intrusive_LazyList_rcu_find_func
+ /**
The function searches the item with key equal to \p key
and calls the functor \p f for item found.
The interface of \p Func functor is:
/// Finds the key \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_intrusive_LazyList_rcu_find_func "find(Q&, Func)"
- but \p pred is used for key comparing.
+ The function is an analog of \p find( Q&, Func ) but \p pred is used for key comparing.
\p Less functor has the interface like \p std::less.
\p pred must imply the same element order as the comparator used for building the list.
*/
}
//@endcond
- /// Finds the key \p key
- /** \anchor cds_intrusive_LazyList_rcu_find_val
+ /// Checks whether the list contains \p key
+ /**
The function searches the item with key equal to \p key
- and returns \p true if \p key found or \p false otherwise.
+ and returns \p true if it is found, and \p false otherwise.
*/
template <typename Q>
+ bool contains( Q const& key ) const
+ {
+ return find_at( const_cast<node_type *>( &m_Head ), key, key_comparator());
+ }
+ //@cond
+ template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
bool find( Q const& key ) const
{
- return find_at( const_cast<node_type *>( &m_Head ), key, key_comparator() );
+ return contains( key );
}
+ //@endcond
- /// Finds the key \p key using \p pred predicate for searching
+ /// Checks whether the map contains \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_intrusive_LazyList_rcu_find_val "find(Q const&)"
- but \p pred is used for key comparing.
+ The function is an analog of \p contains( Q const& ) but \p pred is used for key comparing.
\p Less functor has the interface like \p std::less.
- \p pred must imply the same element order as the comparator used for building the list.
+ \p Less must imply the same element order as the comparator used for building the list.
*/
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 find_at( const_cast<node_type *>( &m_Head ), key, cds::opt::details::make_comparator_from_less<Less>() );
+ return find_at( const_cast<node_type *>( &m_Head ), key, cds::opt::details::make_comparator_from_less<Less>());
+ }
+ //@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 the key \p key and return the item found
/** \anchor cds_intrusive_LazyList_rcu_get
// ...
{
// Lock RCU
- ord_list::rcu_lock lock;
+ typename ord_list::rcu_lock lock;
foo * pVal = theList.get( 5 );
if ( pVal ) {
RCU \p synchronize method can be called.
Note that depending on RCU type used the \ref disposer call can be deferred.
- The function can throw cds::urcu::rcu_deadlock exception if deadlock is encountered and
- deadlock checking policy is opt::v::rcu_throw_deadlock.
+ The function can throw \p cds::urcu::rcu_deadlock exception if deadlock is encountered and
+ deadlock checking policy is \p opt::v::rcu_throw_deadlock.
*/
void clear()
{
- if( !empty() ) {
- check_deadlock_policy::check();
+ if( !empty()) {
+ deadlock_policy::check();
node_type * pHead;
for (;;) {
assert( pNode != nullptr );
// Hack: convert node_type to value_type.
- // In principle, auxiliary node can be non-reducible to value_type
+ // Actually, an auxiliary node should not be converted to value_type
// We assume that comparator can correctly distinguish aux and regular node.
- return insert_at( pHead, *node_traits::to_value_ptr( pNode ) );
+ return insert_at( pHead, *node_traits::to_value_ptr( pNode ));
}
- bool insert_at( node_type * pHead, value_type& val, bool bLock = true )
+ bool insert_at( node_type * pHead, value_type& val )
{
- link_checker::is_empty( node_traits::to_node_ptr( val ) );
- position pos;
- key_comparator cmp;
-
- rcu_lock l( bLock );
- while ( true ) {
- search( pHead, val, pos );
- {
- auto_lock_position alp( pos );
- if ( validate( pos.pPred, pos.pCur )) {
- if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
- // failed: key already in list
- return false;
- }
- else {
- link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
- ++m_ItemCounter;
- return true;
- }
- }
- }
- }
+ rcu_lock l;
+ return insert_at_locked( pHead, val );
}
template <typename Func>
bool insert_at( node_type * pHead, value_type& val, Func f )
{
- link_checker::is_empty( node_traits::to_node_ptr( val ) );
position pos;
key_comparator cmp;
while ( true ) {
search( pHead, val, pos );
{
- auto_lock_position alp( pos );
+ scoped_position_lock sl( pos );
if ( validate( pos.pPred, pos.pCur )) {
if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
// failed: key already in list
return false;
}
- else {
- link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
- f( val );
- ++m_ItemCounter;
- return true;
- }
+
+ f( val );
+ link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
+ ++m_ItemCounter;
+ return true;
}
}
}
}
- iterator insert_at_( node_type * pHead, value_type& val, bool bLock = true )
+ iterator insert_at_( node_type * pHead, value_type& val )
{
- rcu_lock l( bLock );
- if ( insert_at( pHead, val, false ))
+ rcu_lock l;
+ if ( insert_at_locked( pHead, val ))
return iterator( node_traits::to_node_ptr( val ));
return end();
}
template <typename Func>
- std::pair<iterator, bool> ensure_at_( node_type * pHead, value_type& val, Func func, bool bLock = true )
+ std::pair<iterator, bool> update_at_( node_type * pHead, value_type& val, Func func, bool bAllowInsert )
{
- position pos;
- key_comparator cmp;
-
- rcu_lock l( bLock );
- while ( true ) {
- search( pHead, val, pos );
- {
- auto_lock_position alp( pos );
- if ( validate( pos.pPred, pos.pCur )) {
- if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
- // key already in the list
-
- func( false, *node_traits::to_value_ptr( *pos.pCur ) , val );
- return std::make_pair( iterator( pos.pCur ), false );
- }
- else {
- // new key
- link_checker::is_empty( node_traits::to_node_ptr( val ) );
-
- link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
- func( true, val, val );
- ++m_ItemCounter;
- return std::make_pair( iterator( node_traits::to_node_ptr( val )), true );
- }
- }
- }
- }
+ rcu_lock l;
+ return update_at_locked( pHead, val, func, bAllowInsert );
}
template <typename Func>
- std::pair<bool, bool> ensure_at( node_type * pHead, value_type& val, Func func, bool bLock = true )
+ std::pair<bool, bool> update_at( node_type * pHead, value_type& val, Func func, bool bAllowInsert )
{
- rcu_lock l( bLock );
- std::pair<iterator, bool> ret = ensure_at_( pHead, val, func, false );
+ rcu_lock l;
+ std::pair<iterator, bool> ret = update_at_locked( pHead, val, func, bAllowInsert );
return std::make_pair( ret.first != end(), ret.second );
}
{
position pos;
key_comparator cmp;
- check_deadlock_policy::check();
+ deadlock_policy::check();
while ( true ) {
int nResult = 0;
rcu_lock l;
search( pHead, val, pos );
{
- auto_lock_position alp( pos );
- if ( validate( pos.pPred, pos.pCur ) ) {
+ scoped_position_lock alp( pos );
+ if ( validate( pos.pPred, pos.pCur )) {
if ( pos.pCur != &m_Tail
&& cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0
&& node_traits::to_value_ptr( pos.pCur ) == &val )
}
template <typename Q, typename Compare, typename Func>
- bool erase_at( node_type * pHead, Q const& val, Compare cmp, Func f, position& pos )
+ bool erase_at( node_type * const pHead, Q const& val, Compare cmp, Func f, position& pos )
{
- check_deadlock_policy::check();
+ deadlock_policy::check();
while ( true ) {
int nResult = 0;
rcu_lock l;
search( pHead, val, pos, cmp );
{
- auto_lock_position alp( pos );
+ scoped_position_lock alp( pos );
if ( validate( pos.pPred, pos.pCur )) {
if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
// key found
unlink_node( pos.pPred, pos.pCur, pHead );
- f( *node_traits::to_value_ptr( *pos.pCur ) );
+ f( *node_traits::to_value_ptr( *pos.pCur ));
--m_ItemCounter;
nResult = 1;
}
- else {
+ else
nResult = -1;
- }
}
}
}
bool erase_at( node_type * pHead, Q const& val, Compare cmp )
{
position pos;
- return erase_at( pHead, val, cmp, [](value_type const &){}, pos );
+ return erase_at( pHead, val, cmp, [](value_type const&){}, pos );
}
template <typename Q, typename Compare>
- value_type * extract_at( node_type * pHead, Q const& val, Compare cmp )
+ value_type * extract_at( node_type * const pHead, Q const& val, Compare cmp )
{
position pos;
- assert( gc::is_locked() ) ; // RCU must be locked!!!
+ assert( gc::is_locked()) ; // RCU must be locked
while ( true ) {
search( pHead, val, pos, cmp );
int nResult = 0;
{
- auto_lock_position alp( pos );
+ scoped_position_lock alp( pos );
if ( validate( pos.pPred, pos.pCur )) {
if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
// key found
}
template <typename Q, typename Compare, typename Func>
- bool find_at( node_type * pHead, Q& val, Compare cmp, Func f, bool bLock = true ) const
+ bool find_at( node_type * pHead, Q& val, Compare cmp, Func f ) const
{
position pos;
- rcu_lock l( bLock );
+ rcu_lock l;
search( pHead, val, pos, cmp );
if ( pos.pCur != &m_Tail ) {
std::unique_lock< typename node_type::lock_type> al( pos.pCur->m_Lock );
template <typename Q, typename Compare>
const_iterator find_at_( node_type * pHead, Q& val, Compare cmp ) const
{
- assert( gc::is_locked() );
+ assert( gc::is_locked());
position pos;
protected:
//@cond
template <typename Q>
- void search( node_type * pHead, Q const& key, position& pos ) const
+ void search( node_type * const pHead, Q const& key, position& pos ) const
{
- search( pHead, key, pos, key_comparator() );
+ search( pHead, key, pos, key_comparator());
}
template <typename Q, typename Compare>
- void search( node_type * pHead, Q const& key, position& pos, Compare cmp ) const
+ void search( node_type * const pHead, Q const& key, position& pos, Compare cmp ) const
{
- // RCU should be locked!!!
- assert( gc::is_locked() );
+ // RCU should be locked
+ assert( gc::is_locked());
node_type const* pTail = &m_Tail;
marked_node_ptr pCur(pHead);
marked_node_ptr pPrev(pHead);
- while ( pCur.ptr() != pTail && ( pCur.ptr() == pHead || cmp( *node_traits::to_value_ptr( *pCur.ptr() ), key ) < 0 )) {
+ while ( pCur != pTail && ( pCur == pHead || cmp( *node_traits::to_value_ptr( *pCur.ptr()), key ) < 0 )) {
pPrev = pCur;
pCur = pCur->m_pNext.load(memory_model::memory_order_acquire);
+ if ( pCur.bits())
+ pPrev = pCur = pHead;
}
pos.pCur = pCur.ptr();
pos.pPred = pPrev.ptr();
}
- static bool validate( node_type * pPred, node_type * pCur )
+ static bool validate( node_type * pPred, node_type * pCur ) CDS_NOEXCEPT
{
- // RCU lock should be locked!!!
- assert( gc::is_locked() );
+ // RCU lock should be locked
+ assert( gc::is_locked());
return !pPred->is_marked()
&& !pCur->is_marked()
}
//@endcond
+
+ private:
+ //@cond
+ bool insert_at_locked( node_type * pHead, value_type& val )
+ {
+ // RCU lock should be locked
+ assert( gc::is_locked());
+
+ position pos;
+ key_comparator cmp;
+
+ while ( true ) {
+ search( pHead, val, pos );
+ {
+ scoped_position_lock alp( pos );
+ if ( validate( pos.pPred, pos.pCur )) {
+ if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
+ // failed: key already in list
+ return false;
+ }
+
+ link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
+ ++m_ItemCounter;
+ return true;
+ }
+ }
+ }
+ }
+
+ template <typename Func>
+ std::pair<iterator, bool> update_at_locked( node_type * pHead, value_type& val, Func func, bool bAllowInsert )
+ {
+ // RCU lock should be locked
+ assert( gc::is_locked());
+
+ position pos;
+ key_comparator cmp;
+
+ while ( true ) {
+ search( pHead, val, pos );
+ {
+ scoped_position_lock alp( pos );
+ if ( validate( pos.pPred, pos.pCur )) {
+ if ( pos.pCur != &m_Tail && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
+ // key already in the list
+
+ func( false, *node_traits::to_value_ptr( *pos.pCur ), val );
+ return std::make_pair( iterator( pos.pCur ), false );
+ }
+ else {
+ // new key
+ if ( !bAllowInsert )
+ return std::make_pair( end(), false );
+
+ func( true, val, val );
+ link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
+ ++m_ItemCounter;
+ return std::make_pair( iterator( node_traits::to_node_ptr( val )), true );
+ }
+ }
+ }
+ }
+ }
+ //@endcond
};
}} // namespace cds::intrusive
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