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.
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CDSLIB_INTRUSIVE_IMPL_LAZY_LIST_H
- \p T - type to be stored in the list. The type must be based on lazy_list::node (for lazy_list::base_hook)
or it must have a member of type lazy_list::node (for lazy_list::member_hook).
- \p Traits - type traits. See lazy_list::traits for explanation.
- It is possible to declare option-based list with cds::intrusive::lazy_list::make_traits metafunction istead of \p Traits template
+ It is possible to declare option-based list with cds::intrusive::lazy_list::make_traits metafunction instead of \p Traits template
argument. For example, the following traits-based declaration of \p gc::HP lazy list
\code
#include <cds/intrusive/lazy_list_hp.h>
typedef typename get_node_traits< value_type, node_type, hook>::type node_traits; ///< node traits
typedef typename lazy_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::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; ///< C++ memory ordering (see \p lazy_list::traits::memory_model)
+ typedef typename traits::memory_model memory_model; ///< C++ memory ordering (see \p lazy_list::traits::memory_model)
+ typedef typename traits::stat stat; ///< Internal statistics
+
+ static_assert((std::is_same< gc, typename node_type::gc >::value), "GC and node_type::gc must be the same type");
typedef typename gc::template guarded_ptr< value_type > guarded_ptr; ///< Guarded pointer
, typename cds::opt::make_options< traits, Options...>::type
> type;
};
+
+ // Stat selector
+ template <typename Stat>
+ using select_stat_wrapper = lazy_list::select_stat_wrapper< Stat >;
//@endcond
protected:
node_type m_Tail;
item_counter m_ItemCounter;
+ stat m_Stat; ///< Internal statistics
- //@cond
struct clean_disposer {
void operator()( value_type * p )
{
//@endcond
public:
+ ///@name Forward iterators (only for debugging purpose)
+ //@{
/// Forward iterator
/**
The forward iterator for lazy list has some features:
- The iterator cannot be moved across thread boundary since it contains GC's guard that is thread-private GC data.
- Iterator ensures thread-safety even if you delete the item that iterator points to. However, in case of concurrent
deleting operations it 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.
- Therefore, the use of iterators in concurrent environment is not good idea. Use the iterator on the concurrent container
- for debug purpose only.
+ @warning Use this iterator on the concurrent container for debugging purpose only.
*/
typedef iterator_type<false> iterator;
/// Const forward 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
/// Default constructor initializes empty list
LazyList()
{
- static_assert( (std::is_same< gc, typename node_type::gc >::value), "GC and node_type::gc must be the same type" );
m_Head.m_pNext.store( marked_node_ptr( &m_Tail ), memory_model::memory_order_relaxed );
}
+ //@cond
+ template <typename Stat, typename = std::enable_if<std::is_same<stat, lazy_list::wrapped_stat<Stat>>::value >>
+ explicit LazyList( Stat& st )
+ : m_Stat( st )
+ {
+ m_Head.m_pNext.store( marked_node_ptr( &m_Tail ), memory_model::memory_order_relaxed );
+ }
+ //@endcond
+
/// Destroys the list object
~LazyList()
{
While the functor \p f is working the item \p item is locked,
so \p func has exclusive access to the item.
- 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.
this function always returns 0.
@note Even if you use real item counter and it returns 0, this fact does not mean that the list
- is empty. To check list emptyness use \p empty() method.
+ is empty. To check list emptiness use \p empty() method.
*/
size_t size() const
{
return m_ItemCounter.value();
}
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return m_Stat;
+ }
+
protected:
//@cond
// split-list support
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
+ m_Stat.onInsertFailed();
return false;
}
else {
link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
- ++m_ItemCounter;
- return true;
+ break;
}
}
}
+
+ m_Stat.onInsertRetry();
}
+
+ ++m_ItemCounter;
+ m_Stat.onInsertSuccess();
+ return true;
}
template <typename Func>
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
+ m_Stat.onInsertFailed();
return false;
}
else {
link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
f( val );
- ++m_ItemCounter;
- return true;
+ break;
}
}
}
+
+ m_Stat.onInsertRetry();
}
+
+ ++m_ItemCounter;
+ m_Stat.onInsertSuccess();
+ return true;
}
template <typename Func>
// key already in the list
func( false, *node_traits::to_value_ptr( *pos.pCur ) , val );
+ m_Stat.onUpdateExisting();
return std::make_pair( true, false );
}
else {
// new key
- if ( !bAllowInsert )
+ if ( !bAllowInsert ) {
+ m_Stat.onUpdateFailed();
return std::make_pair( false, false );
+ }
link_node( node_traits::to_node_ptr( val ), pos.pPred, pos.pCur );
func( true, val, val );
- ++m_ItemCounter;
- return std::make_pair( true, true );
+ break;
}
}
}
+
+ m_Stat.onUpdateRetry();
}
+
+ ++m_ItemCounter;
+ m_Stat.onUpdateNew();
+ return std::make_pair( true, true );
}
bool unlink_at( node_type * pHead, value_type& val )
{
// item found
unlink_node( pos.pPred, pos.pCur, pHead );
- --m_ItemCounter;
nResult = 1;
}
else
nResult = -1;
}
}
+
if ( nResult ) {
if ( nResult > 0 ) {
+ --m_ItemCounter;
retire_node( pos.pCur );
+ m_Stat.onEraseSuccess();
return true;
}
+
+ m_Stat.onEraseFailed();
return false;
}
}
+
+ m_Stat.onEraseRetry();
}
}
// key found
unlink_node( pos.pPred, pos.pCur, pHead );
f( *node_traits::to_value_ptr( *pos.pCur ));
- --m_ItemCounter;
nResult = 1;
}
else {
}
if ( nResult ) {
if ( nResult > 0 ) {
+ --m_ItemCounter;
retire_node( pos.pCur );
+ m_Stat.onEraseSuccess();
return true;
}
+
+ m_Stat.onEraseFailed();
return false;
}
}
+
+ m_Stat.onEraseRetry();
}
}
&& cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 )
{
f( *node_traits::to_value_ptr( *pos.pCur ), val );
+ m_Stat.onFindSuccess();
return true;
}
}
+
+ m_Stat.onFindFailed();
return false;
}
position pos;
search( pHead, val, pos, cmp );
- return pos.pCur != &m_Tail
- && !pos.pCur->is_marked()
- && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0;
+ if ( pos.pCur != &m_Tail && !pos.pCur->is_marked() && cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 ) {
+ m_Stat.onFindSuccess();
+ return true;
+ }
+
+ m_Stat.onFindFailed();
+ return false;
}
template <typename Q, typename Compare>
&& cmp( *node_traits::to_value_ptr( *pos.pCur ), val ) == 0 )
{
gp.set( pos.guards.template get<value_type>( position::guard_current_item ));
+ m_Stat.onFindSuccess();
return true;
}
+
+ m_Stat.onFindFailed();
return false;
}
pos.pPred = pPrev.ptr();
}
- static bool validate( node_type * pPred, node_type * pCur )
+ bool validate( node_type * pPred, node_type * pCur ) CDS_NOEXCEPT
+ {
+ if ( validate_link( pPred, pCur )) {
+ m_Stat.onValidationSuccess();
+ return true;
+ }
+
+ m_Stat.onValidationFailed();
+ return false;
+ }
+
+ static bool validate_link( node_type * pPred, node_type * pCur ) CDS_NOEXCEPT
{
return !pPred->is_marked()
&& !pCur->is_marked()
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