- \p GC - Garbage collector used
- \p Key - key type of an item stored in the map. It should be copy-constructible
- \p Value - value type stored in the map
- - \p Traits - type traits, default is split_list::type_traits. Instead of declaring split_list::type_traits -based
- struct you may apply option-based notation with split_list::make_traits metafunction.
+ - \p Traits - map traits, default is \p split_list::traits. Instead of declaring \p %split_list::traits -based
+ struct you may apply option-based notation with \p split_list::make_traits metafunction.
There are the specializations:
- for \ref cds_urcu_desc "RCU" - declared in <tt>cd/container/split_list_map_rcu.h</tt>,
\par Usage
You should decide what garbage collector you want, and what ordered list you want to use. Split-ordered list
- is original data structure based on an ordered list. Suppose, you want construct split-list map based on gc::HP GC
- and MichaelList as ordered list implementation. Your map should map \p int key to <tt>std::string</tt> value.
+ is original data structure based on an ordered list. Suppose, you want construct split-list map based on \p gc::HP GC
+ and \p MichaelList as ordered list implementation. Your map should map \p int key to \p std::string value.
So, you beginning your program with following include:
\code
#include <cds/container/michael_list_hp.h>
The inclusion order is important: first, include file for ordered-list implementation (for this example, <tt>cds/container/michael_list_hp.h</tt>),
then the header for split-list map <tt>cds/container/split_list_map.h</tt>.
- Now, you should declare traits for split-list map. The main parts of traits are a hash functor for the map key and a comparing functor for ordered list.
+ Now, you should declare traits for split-list map. The main parts of traits are a hash functor and a comparing functor for the ordered list.
We use <tt>std::hash<int></tt> as hash functor and <tt>std::less<int></tt> predicate as comparing functor.
- The second attention: instead of using \p %MichaelList in \p %SplitListMap traits we use a tag <tt>cds::contaner::michael_list_tag</tt> for the Michael's list.
+ The second attention: instead of using \p %MichaelList in \p %SplitListMap traits we use a tag \p cds::contaner::michael_list_tag for the Michael's list.
The split-list requires significant support from underlying ordered list class and it is not good idea to dive you
into deep implementation details of split-list and ordered list interrelations. The tag paradigm simplifies split-list interface.
\code
// SplitListMap traits
- struct foo_set_traits: public cc::split_list::type_traits
+ struct foo_set_traits: public cc::split_list::traits
{
typedef cc::michael_list_tag ordered_list ; // what type of ordered list we want to use
typedef std::hash<int> hash ; // hash functor for the key stored in split-list map
// Type traits for our MichaelList class
- struct ordered_list_traits: public cc::michael_list::type_traits
+ struct ordered_list_traits: public cc::michael_list::traits
{
typedef std::less<int> less ; // use our std::less predicate as comparator to order list nodes
};
};
\endcode
- Now you are ready to declare our map class based on SplitListMap:
+ Now you are ready to declare our map class based on \p %SplitListMap:
\code
- typedef cc::SplitListMap< cds::gc::PTB, int, std::string, foo_set_traits > int_string_map;
+ typedef cc::SplitListMap< cds::gc::DHP, int, std::string, foo_set_traits > int_string_map;
\endcode
You may use the modern option-based declaration instead of classic type-traits-based one:
\code
typedef cc:SplitListMap<
- cs::gc::PTB // GC used
+ cs::gc::DHP // GC used
,int // key type
,std::string // value type
,cc::split_list::make_traits< // metafunction to build split-list traits
>::type
> int_string_map;
\endcode
- In case of option-based declaration using split_list::make_traits metafunction the struct \p foo_set_traits is not required.
+ In case of option-based declaration with \p split_list::make_traits metafunction the struct \p foo_set_traits is not required.
Now, the map of type \p int_string_map is ready to use in your program.
- Note that in this example we show only mandatory type_traits parts, optional ones is the default and they are inherited
- from cds::container::split_list::type_traits.
- The <b>cds</b> library contains many other options for deep tuning of behavior of the split-list and
+ Note that in this example we show only mandatory \p traits parts, optional ones is the default and they are inherited
+ from \p container::split_list::traits. There are many other options for deep tuning of the split-list and
ordered-list containers.
*/
template <
typename Key,
typename Value,
#ifdef CDS_DOXYGEN_INVOKED
- class Traits = split_list::type_traits
+ class Traits = split_list::traits
#else
class Traits
#endif
//@endcond
public:
- typedef typename base_class::gc gc ; ///< Garbage collector
- typedef Key key_type ; ///< key type
- typedef Value mapped_type ; ///< type of value stored in the map
- typedef Traits options ; ///< \p Traits template argument
+ typedef GC gc; ///< Garbage collector
+ typedef Key key_type; ///< key type
+ typedef Value mapped_type; ///< type of value to be stored in the map
+ typedef Traits options; ///< Map traits
typedef std::pair<key_type const, mapped_type> value_type ; ///< key-value pair type
typedef typename base_class::ordered_list ordered_list; ///< Underlying ordered list class
- typedef typename base_class::key_comparator key_comparator ; ///< key compare functor
+ typedef typename base_class::key_comparator key_comparator; ///< key compare functor
- typedef typename base_class::hash hash ; ///< Hash functor for \ref key_type
- typedef typename base_class::item_counter item_counter ; ///< Item counter type
+ typedef typename base_class::hash hash; ///< Hash functor for \ref key_type
+ typedef typename base_class::item_counter item_counter; ///< Item counter type
+ typedef typename base_class::stat stat; ///< Internal statistics
protected:
//@cond
- typedef typename base_class::maker::type_traits::key_accessor key_accessor;
+ typedef typename base_class::maker::traits::key_accessor key_accessor;
typedef typename base_class::node_type node_type;
+ //@endcond
public:
/// Guarded pointer
- typedef cds::gc::guarded_ptr< gc, node_type, value_type, details::guarded_ptr_cast_set<node_type, value_type> > guarded_ptr;
-
-
-# ifndef CDS_CXX11_LAMBDA_SUPPORT
- template <typename Func>
- class ensure_functor_wrapper: protected cds::details::functor_wrapper<Func>
- {
- typedef cds::details::functor_wrapper<Func> base_class;
- public:
- ensure_functor_wrapper() {}
- ensure_functor_wrapper( Func f ): base_class(f) {}
-
- template <typename Q>
- void operator()( bool bNew, value_type& item, const Q& /*val*/ )
- {
- base_class::get()( bNew, item );
- }
- };
-
- template <typename Func>
- class find_functor_wrapper: protected cds::details::functor_wrapper<Func>
- {
- typedef cds::details::functor_wrapper<Func> base_class;
- public:
- find_functor_wrapper() {}
- find_functor_wrapper( Func f ): base_class(f) {}
-
- template <typename Q>
- void operator()( value_type& pair, Q const& /*val*/ )
- {
- base_class::get()( pair );
- }
- };
-# endif // ifndef CDS_CXX11_LAMBDA_SUPPORT
- //@endcond
+ typedef typename gc::template guarded_ptr< node_type, value_type, details::guarded_ptr_cast_set<node_type, value_type> > guarded_ptr;
public:
- /// Forward iterator (see SplitListSet::iterator)
+ /// Forward iterator (see \p SplitListSet::iterator)
/**
Remember, the iterator <tt>operator -> </tt> and <tt>operator *</tt> returns \ref value_type pointer and reference.
To access item key and value use <tt>it->first</tt> and <tt>it->second</tt> respectively.
{
return base_class::begin();
}
- const_iterator cbegin()
+ const_iterator cbegin() const
{
return base_class::cbegin();
}
{
return base_class::end();
}
- const_iterator cend()
+ const_iterator cend() const
{
return base_class::cend();
}
/// Initializes split-ordered map of default capacity
/**
The default capacity is defined in bucket table constructor.
- See intrusive::split_list::expandable_bucket_table, intrusive::split_list::static_bucket_table
- which selects by intrusive::split_list::dynamic_bucket_table option.
+ See \p intrusive::split_list::expandable_bucket_table, \p intrusive::split_list::static_bucket_table
+ which selects by \p intrusive::split_list::traits::dynamic_bucket_table.
*/
SplitListMap()
: base_class()
/// Initializes split-ordered map
SplitListMap(
- size_t nItemCount ///< estimate average item count
+ size_t nItemCount ///< estimated average item count
, size_t nLoadFactor = 1 ///< load factor - average item count per bucket. Small integer up to 10, default is 1.
)
: base_class( nItemCount, nLoadFactor )
- <tt>item.second</tt> is a reference to item's value that may be changed.
It should be keep in mind that concurrent modifications of \p <tt>item.second</tt> may be possible.
- User-defined functor \p func should guarantee that during changing item's value no any other changes
- could be made on this \p item by concurrent threads.
-
- The user-defined functor can be passed by reference using <tt>boost::ref</tt>
- and it is called only if inserting is successful.
The key_type should be constructible from value of type \p K.
This can be useful if complete initialization of object of \p mapped_type is heavyweight and
it is preferable that the initialization should be completed only if inserting is successful.
+
+ @warning For \ref cds_nonintrusive_MichaelKVList_gc "MichaelKVList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ \ref cds_nonintrusive_LazyKVList_gc "LazyKVList" provides exclusive access to inserted item and does not require any node-level
+ synchronization.
*/
template <typename K, typename Func>
- bool insert_key( K const& key, Func func )
+ bool insert_with( K const& key, Func func )
{
//TODO: pass arguments by reference (make_pair makes copy)
return base_class::insert( std::make_pair( key, mapped_type() ), func );
}
- /// For key \p key inserts data of type \ref mapped_type constructed with <tt>std::forward<Args>(args)...</tt>
+ /// For key \p key inserts data of type \p mapped_type created from \p args
/**
\p key_type should be constructible from type \p K
- \p bNew - \p true if the item has been inserted, \p false otherwise
- \p item - item of the list
- The functor may change any fields of the \p item.second that is \ref mapped_type;
- however, \p func must guarantee that during changing no any other modifications
- could be made on this item by concurrent threads.
-
- You may pass \p func argument by reference using <tt>boost::ref</tt>.
-
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 list.
+
+ @warning For \ref cds_nonintrusive_MichaelKVList_gc "MichaelKVList" as the ordered list see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ \ref cds_nonintrusive_LazyKVList_gc "LazyKVList" provides exclusive access to inserted item and does not require any node-level
+ synchronization.
*/
template <typename K, typename Func>
std::pair<bool, bool> ensure( K const& key, Func func )
{
//TODO: pass arguments by reference (make_pair makes copy)
-# ifdef CDS_CXX11_LAMBDA_SUPPORT
return base_class::ensure( std::make_pair( key, mapped_type() ),
[&func](bool bNew, value_type& item, value_type const& /*val*/) {
- cds::unref(func)( bNew, item );
+ func( bNew, item );
} );
-# else
- ensure_functor_wrapper<Func> fw( func );
- return base_class::ensure( std::make_pair( key, mapped_type() ), cds::ref(fw) );
-# endif
}
/// Deletes \p key from the map
template <typename K, typename Less>
bool erase_with( K const& key, Less pred )
{
+ CDS_UNUSED( pred );
return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
}
void operator()(value_type& item) { ... }
};
\endcode
- The functor may be passed by reference using <tt>boost:ref</tt>
Return \p true if key is found and deleted, \p false otherwise
*/
template <typename K, typename Less, typename Func>
bool erase_with( K const& key, Less pred, Func f )
{
+ CDS_UNUSED( pred );
return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>(), f );
}
/// Extracts the item with specified \p key
/** \anchor cds_nonintrusive_SplitListMap_hp_extract
The function searches an item with key equal to \p key,
- unlinks it from the map, and returns it in \p dest parameter.
- If the item with key equal to \p key is not found the function returns \p false.
+ unlinks it from the map, and returns it as \p guarded_ptr.
+ If \p key is not found the function returns an empty guarded pointer.
Note the compare functor should accept a parameter of type \p K that may be not the same as \p value_type.
- The extracted item is freed automatically when returned \ref guarded_ptr object will be destroyed or released.
+ The extracted item is freed automatically when returned \p guarded_ptr object will be destroyed or released.
@note Each \p guarded_ptr object uses the GC's guard that can be limited resource.
Usage:
splitlist_map theMap;
// ...
{
- splitlist_map::guarded_ptr gp;
- theMap.extract( gp, 5 );
- // Deal with gp
- // ...
-
+ splitlist_map::guarded_ptr gp(theMap.extract( 5 ));
+ if ( gp ) {
+ // Deal with gp
+ // ...
+ }
// Destructor of gp releases internal HP guard
}
\endcode
*/
template <typename K>
- bool extract( guarded_ptr& dest, K const& key )
+ guarded_ptr extract( K const& key )
{
- return base_class::extract_( dest.guard(), key );
+ guarded_ptr gp;
+ base_class::extract_( gp.guard(), key );
+ return gp;
}
/// Extracts the item using compare functor \p pred
/**
- The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_extract "extract(guarded_ptr&, K const&)"
+ The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_extract "extract(K const&)"
but \p pred predicate is used for key comparing.
\p Less functor has the semantics like \p std::less but should take arguments of type \ref value_type and \p K
\p pred must imply the same element order as the comparator used for building the map.
*/
template <typename K, typename Less>
- bool extract_with( guarded_ptr& dest, K const& key, Less pred )
+ guarded_ptr extract_with( K const& key, Less pred )
{
- return base_class::extract_with_( dest.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ guarded_ptr gp;
+ base_class::extract_with_( gp.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ return gp;
}
/// Finds the key \p key
\endcode
where \p item is the item found.
- You may pass \p f argument by reference using <tt>boost::ref</tt> or cds::ref.
-
The functor may change \p item.second. Note that the functor is only guarantee
that \p item cannot be disposed during functor is executing.
The functor does not serialize simultaneous access to the map's \p item. If such access is
template <typename K, typename Func>
bool find( K const& key, Func f )
{
-# ifdef CDS_CXX11_LAMBDA_SUPPORT
- return base_class::find( key, [&f](value_type& pair, K const&){ cds::unref(f)( pair ); } );
-# else
- find_functor_wrapper<Func> fw(f);
- return base_class::find( key, cds::ref(fw) );
-# endif
+ return base_class::find( key, [&f](value_type& pair, K const&){ f( pair ); } );
}
/// Finds the key \p val using \p pred predicate for searching
template <typename K, typename Less, typename Func>
bool find_with( K const& key, Less pred, Func f )
{
-# ifdef CDS_CXX11_LAMBDA_SUPPORT
+ CDS_UNUSED( pred );
return base_class::find_with( key,
cds::details::predicate_wrapper<value_type, Less, key_accessor>(),
- [&f](value_type& pair, K const&){ cds::unref(f)( pair ); } );
-# else
- find_functor_wrapper<Func> fw(f);
- return base_class::find_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>(), cds::ref(fw) );
-# endif
+ [&f](value_type& pair, K const&){ f( pair ); } );
}
/// Finds the key \p key
template <typename K, typename Less>
bool find_with( K const& key, Less pred )
{
+ CDS_UNUSED( pred );
return base_class::find( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
}
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_SplitListMap_hp_get
The function searches the item with key equal to \p key
- and assigns the item found to guarded pointer \p ptr.
- The function returns \p true if \p key is found, and \p false otherwise.
- If \p key is not found the \p ptr parameter is not changed.
+ and returns the item found as a guarded pointer.
+ If \p key is not found the function returns an empty guarded pointer.
@note Each \p guarded_ptr object uses one GC's guard which can be limited resource.
splitlist_map theMap;
// ...
{
- splitlist_map::guarded_ptr gp;
- if ( theMap.get( gp, 5 )) {
+ splitlist_map::guarded_ptr gp(theMap.get( 5 ));
+ if ( gp ) {
// Deal with gp
//...
}
should accept a parameter of type \p K that can be not the same as \p value_type.
*/
template <typename K>
- bool get( guarded_ptr& ptr, K const& key )
+ guarded_ptr get( K const& key )
{
- return base_class::get_( ptr.guard(), key );
+ guarded_ptr gp;
+ base_class::get_( gp.guard(), key );
+ return gp;
}
/// Finds \p key and return the item found
/**
- The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_get "get( guarded_ptr&, K const&)"
+ The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_get "get( K const&)"
but \p pred is used for comparing the keys.
\p Less functor has the semantics like \p std::less but should take arguments of type \ref value_type and \p K
\p pred must imply the same element order as the comparator used for building the map.
*/
template <typename K, typename Less>
- bool get_with( guarded_ptr& ptr, K const& key, Less pred )
+ guarded_ptr get_with( K const& key, Less pred )
{
- return base_class::get_with_( ptr.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ guarded_ptr gp;
+ base_class::get_with_( gp.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ return gp;
}
- /// Clears the map (non-atomic)
- /**
- The function unlink all items from the map.
- The function is not atomic and not lock-free and should be used for debugging only.
- */
+ /// Clears the map (not atomic)
void clear()
{
base_class::clear();
{
return base_class::size();
}
+
+ /// Returns internal statistics
+ stat const& statistics() const
+ {
+ return base_class::statistics();
+ }
};
projects / libcds.git / blobdiff