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_CONTAINER_MICHAEL_SET_RCU_H
{
public:
typedef cds::urcu::gc< RCU > gc; ///< RCU used as garbage collector
- typedef OrderedList bucket_type; ///< type of ordered list to be used as a bucket implementation
+ typedef OrderedList ordered_list; ///< type of ordered list to be used as a bucket implementation
typedef Traits traits; ///< Set traits
- typedef typename bucket_type::value_type value_type; ///< type of value to be stored in the list
- typedef typename bucket_type::key_comparator key_comparator; ///< key comparing functor
+ typedef typename ordered_list::value_type value_type; ///< type of value to be stored in the list
+ typedef typename ordered_list::key_comparator key_comparator; ///< key comparing functor
+ typedef typename ordered_list::stat stat; ///< Internal statistics
/// Hash functor for \ref value_type and all its derivatives that you use
typedef typename cds::opt::v::hash_selector< typename traits::hash >::type hash;
- typedef typename traits::item_counter item_counter; ///< Item counter type
+ typedef typename traits::item_counter item_counter; ///< Item counter type
+ typedef typename traits::allocator allocator; ///< Bucket table allocator
- typedef typename bucket_type::rcu_lock rcu_lock; ///< RCU scoped lock
- typedef typename bucket_type::exempt_ptr exempt_ptr; ///< pointer to extracted node
- typedef typename bucket_type::raw_ptr raw_ptr; ///< Return type of \p get() member function and its derivatives
+ typedef typename ordered_list::rcu_lock rcu_lock; ///< RCU scoped lock
/// Group of \p extract_xxx functions require external locking if underlying ordered list requires that
- static CDS_CONSTEXPR const bool c_bExtractLockExternal = bucket_type::c_bExtractLockExternal;
+ static CDS_CONSTEXPR const bool c_bExtractLockExternal = ordered_list::c_bExtractLockExternal;
- protected:
- //@cond
- class internal_bucket_type: public bucket_type
+ // GC and OrderedList::gc must be the same
+ static_assert(std::is_same<gc, typename ordered_list::gc>::value, "GC and OrderedList::gc must be the same");
+
+ static_assert(!std::is_same<item_counter, atomicity::empty_item_counter>::value,
+ "atomicity::empty_item_counter is not allowed as a item counter");
+
+#ifdef CDS_DOXYGEN_INVOKED
+ /// Wrapped internal statistics for \p ordered_list
+ typedef implementatin_specific bucket_stat;
+
+ /// Internal bucket type - rebind \p ordered_list with empty item counter and wrapped internal statistics
+ typedef modified_ordered_list internal_bucket_type;
+#else
+ typedef typename ordered_list::template select_stat_wrapper< typename ordered_list::stat > bucket_stat;
+
+ typedef typename ordered_list::template rebind_traits<
+ cds::opt::item_counter< cds::atomicity::empty_item_counter >
+ , cds::opt::stat< typename bucket_stat::wrapped_stat >
+ >::type internal_bucket_type_;
+
+ class internal_bucket_type: public internal_bucket_type_
{
- typedef bucket_type base_class;
+ typedef internal_bucket_type_ base_class;
public:
+ using base_class::base_class;
using base_class::node_type;
using base_class::alloc_node;
using base_class::insert_node;
using base_class::node_to_value;
};
+#endif
- /// Bucket table allocator
- typedef cds::details::Allocator< internal_bucket_type, typename traits::allocator > bucket_table_allocator;
-
- //@endcond
-
- protected:
- item_counter m_ItemCounter; ///< Item counter
- hash m_HashFunctor; ///< Hash functor
- internal_bucket_type * m_Buckets; ///< bucket table
-
- private:
- //@cond
- const size_t m_nHashBitmask;
- //@endcond
+ typedef typename internal_bucket_type::exempt_ptr exempt_ptr; ///< pointer to extracted node
+ typedef typename internal_bucket_type::raw_ptr raw_ptr; ///< Return type of \p get() member function and its derivatives
protected:
//@cond
- /// Calculates hash value of \p key
- template <typename Q>
- size_t hash_value( Q const& key ) const
- {
- return m_HashFunctor( key ) & m_nHashBitmask;
- }
+ /// Bucket table allocator
+ typedef typename allocator::template rebind< internal_bucket_type >::other bucket_table_allocator;
- /// Returns the bucket (ordered list) for \p key
- template <typename Q>
- internal_bucket_type& bucket( Q const& key )
- {
- return m_Buckets[ hash_value( key ) ];
- }
- template <typename Q>
- internal_bucket_type const& bucket( Q const& key ) const
- {
- return m_Buckets[ hash_value( key ) ];
- }
+ const size_t m_nHashBitmask;
+ item_counter m_ItemCounter; ///< Item counter
+ hash m_HashFunctor; ///< Hash functor
+ internal_bucket_type* m_Buckets; ///< bucket table
+ typename bucket_stat::stat m_Stat; ///< Internal statistics
//@endcond
+
public:
///@name Forward iterators (thread-safe under RCU lock)
//@{
};
\endcode
*/
- typedef michael_set::details::iterator< bucket_type, false > iterator;
+ typedef michael_set::details::iterator< internal_bucket_type, false > iterator;
/// Const forward iterator
- typedef michael_set::details::iterator< bucket_type, true > const_iterator;
+ typedef michael_set::details::iterator< internal_bucket_type, true > const_iterator;
/// Returns a forward iterator addressing the first element in a set
/**
}
//@}
- private:
- //@cond
- const_iterator get_const_begin() const
- {
- return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[0]).begin(), m_Buckets, m_Buckets + bucket_count() );
- }
- const_iterator get_const_end() const
- {
- return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[bucket_count() - 1]).end(), m_Buckets + bucket_count() - 1, m_Buckets + bucket_count() );
- }
- //@endcond
-
public:
/// Initialize hash set
/**
size_t nMaxItemCount, ///< estimation of max item count in the hash set
size_t nLoadFactor ///< load factor: estimation of max number of items in the bucket
) : m_nHashBitmask( michael_set::details::init_hash_bitmask( nMaxItemCount, nLoadFactor ))
+ , m_Buckets( bucket_table_allocator().allocate( bucket_count() ) )
{
- // GC and OrderedList::gc must be the same
- static_assert( std::is_same<gc, typename bucket_type::gc>::value, "GC and OrderedList::gc must be the same");
-
- static_assert( !std::is_same<item_counter, atomicity::empty_item_counter>::value,
- "atomicity::empty_item_counter is not allowed as a item counter");
-
- m_Buckets = bucket_table_allocator().NewArray( bucket_count() );
+ for ( auto it = m_Buckets, itEnd = m_Buckets + bucket_count(); it != itEnd; ++it )
+ construct_bucket<bucket_stat>( it );
}
/// Clears hash set and destroys it
~MichaelHashSet()
{
clear();
- bucket_table_allocator().Delete( m_Buckets, bucket_count() );
+
+ for ( auto it = m_Buckets, itEnd = m_Buckets + bucket_count(); it != itEnd; ++it )
+ it->~internal_bucket_type();
+ bucket_table_allocator().deallocate( m_Buckets, bucket_count() );
+
}
/// Inserts new node
Returns \p true if \p val is inserted into the set, \p false otherwise.
*/
template <typename Q>
- bool insert( Q const& val )
+ bool insert( Q&& val )
{
- const bool bRet = bucket( val ).insert( val );
+ const bool bRet = bucket( val ).insert( std::forward<Q>( val ));
if ( bRet )
++m_ItemCounter;
return bRet;
synchronization.
*/
template <typename Q, typename Func>
- bool insert( Q const& val, Func f )
+ bool insert( Q&& val, Func f )
{
- const bool bRet = bucket( val ).insert( val, f );
+ const bool bRet = bucket( val ).insert( std::forward<Q>( val ), f );
if ( bRet )
++m_ItemCounter;
return bRet;
}
-
/// Updates the element
/**
The operation performs inserting or changing data with lock-free manner.
synchronization.
*/
template <typename Q, typename Func>
- std::pair<bool, bool> update( const Q& val, Func func, bool bAllowInsert = true )
+ std::pair<bool, bool> update( Q const& val, Func func, bool bAllowInsert = true )
{
std::pair<bool, bool> bRet = bucket( val ).update( val, func, bAllowInsert );
if ( bRet.second )
If the item with the key equal to \p key is not found the function return an empty \p exempt_ptr.
The function just excludes the item from the set and returns a pointer to item found.
- Depends on \p bucket_type you should or should not lock RCU before calling of this function:
+ Depends on \p ordered_list you should or should not lock RCU before calling of this function:
- for the set based on \ref cds_nonintrusive_MichaelList_rcu "MichaelList" RCU should not be locked
- for the set based on \ref cds_nonintrusive_LazyList_rcu "LazyList" RCU should be locked
See ordered list implementation for details.
/** \anchor cds_nonintrusive_MichaelHashSet_rcu_get
The function searches the item with key equal to \p key and returns the pointer to item found.
If \p key is not found it returns \p nullptr.
- Note the type of returned value depends on underlying \p bucket_type.
+ Note the type of returned value depends on underlying \p ordered_list.
For details, see documentation of ordered list you use.
Note the compare functor should accept a parameter of type \p Q that can be not the same as \p value_type.
return m_ItemCounter;
}
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return m_Stat;
+ }
+
/// Returns the size of hash table
/**
Since \p %MichaelHashSet cannot dynamically extend the hash table size,
{
return m_nHashBitmask + 1;
}
+
+ protected:
+ //@cond
+ /// Calculates hash value of \p key
+ template <typename Q>
+ size_t hash_value( Q const& key ) const
+ {
+ return m_HashFunctor( key ) & m_nHashBitmask;
+ }
+
+ /// Returns the bucket (ordered list) for \p key
+ template <typename Q>
+ internal_bucket_type& bucket( Q const& key )
+ {
+ return m_Buckets[hash_value( key )];
+ }
+ template <typename Q>
+ internal_bucket_type const& bucket( Q const& key ) const
+ {
+ return m_Buckets[hash_value( key )];
+ }
+
+ template <typename Stat>
+ typename std::enable_if< Stat::empty >::type construct_bucket( internal_bucket_type* bucket )
+ {
+ new (bucket) internal_bucket_type;
+ }
+
+ template <typename Stat>
+ typename std::enable_if< !Stat::empty >::type construct_bucket( internal_bucket_type* bucket )
+ {
+ new (bucket) internal_bucket_type( m_Stat );
+ }
+
+ const_iterator get_const_begin() const
+ {
+ return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[0]).begin(), m_Buckets, m_Buckets + bucket_count() );
+ }
+ const_iterator get_const_end() const
+ {
+ return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[bucket_count() - 1]).end(), m_Buckets + bucket_count() - 1, m_Buckets + bucket_count() );
+ }
+ //@endcond
};
}} // namespace cds::container
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