-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
-#ifndef __CDS_CONTAINER_SEGMENTED_QUEUE_H
-#define __CDS_CONTAINER_SEGMENTED_QUEUE_H
+ (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_CONTAINER_SEGMENTED_QUEUE_H
+#define CDSLIB_CONTAINER_SEGMENTED_QUEUE_H
#include <memory>
#include <functional> // ref
enum { alignment = opt::cache_line_alignment };
/// Padding of segment data, default is no special padding
- /** @copydetails cds::intrusive::segmented_queue::traits::padding
+ /**
+ The segment is just an array of atomic data pointers,
+ so, the high load leads to false sharing and performance degradation.
+ A padding of segment data can eliminate false sharing issue.
+ On the other hand, the padding leads to increase segment size.
*/
enum { padding = cds::intrusive::segmented_queue::traits::padding };
typedef CDS_DEFAULT_ALLOCATOR allocator;
/// Lock type used to maintain an internal list of allocated segments
- typedef cds::lock::Spin lock_type;
+ typedef cds::sync::spin lock_type;
/// Random \ref cds::opt::permutation_generator "permutation generator" for sequence [0, quasi_factor)
typedef cds::opt::v::random2_permutation<int> permutation_generator;
typedef typename base_class::lock_type lock_type ; ///< Type of mutex for maintaining an internal list of allocated segments.
typedef typename base_class::permutation_generator permutation_generator; ///< Random permutation generator for sequence [0, quasi-factor)
- static const size_t m_nHazardPtrCount = base_class::m_nHazardPtrCount ; ///< Count of hazard pointer required for the algorithm
+ static const size_t c_nHazardPtrCount = base_class::c_nHazardPtrCount ; ///< Count of hazard pointer required for the algorithm
protected:
//@cond
*/
bool enqueue( value_type const& val )
{
- scoped_node_ptr p( alloc_node(val) );
- if ( base_class::enqueue( *p ) ) {
+ scoped_node_ptr p( alloc_node(val));
+ if ( base_class::enqueue( *p )) {
+ p.release();
+ return true;
+ }
+ return false;
+ }
+
+ /// Inserts a new element at last segment of the queue, move semantics
+ bool enqueue( value_type&& val )
+ {
+ scoped_node_ptr p( alloc_node_move( std::move( val )));
+ if ( base_class::enqueue( *p )) {
p.release();
return true;
}
template <typename Func>
bool enqueue_with( Func f )
{
- scoped_node_ptr p( alloc_node() );
+ scoped_node_ptr p( alloc_node());
f( *p );
- if ( base_class::enqueue( *p ) ) {
+ if ( base_class::enqueue( *p )) {
p.release();
return true;
}
}
- /// Synonym for \p enqueue() member function
+ /// Synonym for \p enqueue( value_type const& ) member function
bool push( value_type const& val )
{
return enqueue( val );
}
+ /// Synonym for \p enqueue( value_type&& ) member function
+ bool push( value_type&& val )
+ {
+ return enqueue( std::move( val ));
+ }
+
/// Synonym for \p enqueue_with() member function
template <typename Func>
bool push_with( Func f )
template <typename... Args>
bool emplace( Args&&... args )
{
- scoped_node_ptr p( alloc_node_move( std::forward<Args>(args)... ) );
+ scoped_node_ptr p( alloc_node_move( std::forward<Args>(args)... ));
if ( base_class::enqueue( *p )) {
p.release();
return true;
*/
bool dequeue( value_type& dest )
{
- return dequeue_with( [&dest]( value_type& src ) { dest = src; });
+ return dequeue_with( [&dest]( value_type& src ) { dest = std::move( src );});
}
/// Dequeues a value using a functor
/// Clear the queue
/**
- The function repeatedly calls \ref dequeue until it returns \p nullptr.
+ The function repeatedly calls \p dequeue() until it returns \p nullptr.
The disposer specified in \p Traits template argument is called for each removed item.
*/
void clear()
}} // namespace cds::container
-#endif // #ifndef __CDS_CONTAINER_SEGMENTED_QUEUE_H
+#endif // #ifndef CDSLIB_CONTAINER_SEGMENTED_QUEUE_H
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