-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (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_FCQUEUE_H
#define CDSLIB_CONTAINER_FCQUEUE_H
/// Metafunction converting option list to traits
/**
\p Options are:
- - \p opt::lock_type - mutex type, default is \p cds::sync::spin
- - \p opt::back_off - back-off strategy, defalt is \p cds::backoff::delay_of<2>
- - \p opt::allocator - allocator type, default is \ref CDS_DEFAULT_ALLOCATOR
+ - any \p cds::algo::flat_combining::make_traits options
- \p opt::stat - internal statistics, possible type: \p fcqueue::stat, \p fcqueue::empty_stat (the default)
- - \p opt::memory_model - C++ memory ordering model.
- List of all available memory ordering see \p opt::memory_model.
- Default is \p cds::opt::v:relaxed_ordering
- \p opt::enable_elimination - enable/disable operation \ref cds_elimination_description "elimination"
By default, the elimination is disabled. For queue, the elimination is possible if the queue
is empty.
op_enq = cds::algo::flat_combining::req_Operation, ///< Enqueue
op_enq_move, ///< Enqueue (move semantics)
op_deq, ///< Dequeue
- op_clear, ///< Clear
- op_empty ///< Empty
+ op_clear ///< Clear
};
/// Flat combining publication list record
protected:
//@cond
- fc_kernel m_FlatCombining;
- queue_type m_Queue;
+ mutable fc_kernel m_FlatCombining;
+ queue_type m_Queue;
//@endcond
public:
*/
bool enqueue( value_type const& val )
{
- fc_record * pRec = m_FlatCombining.acquire_record();
+ auto pRec = m_FlatCombining.acquire_record();
pRec->pValEnq = &val;
if ( c_bEliminationEnabled )
else
m_FlatCombining.combine( op_enq, pRec, *this );
- assert( pRec->is_done() );
+ assert( pRec->is_done());
m_FlatCombining.release_record( pRec );
m_FlatCombining.internal_statistics().onEnqueue();
return true;
*/
bool enqueue( value_type&& val )
{
- fc_record * pRec = m_FlatCombining.acquire_record();
+ auto pRec = m_FlatCombining.acquire_record();
pRec->pValEnq = &val;
if ( c_bEliminationEnabled )
else
m_FlatCombining.combine( op_enq_move, pRec, *this );
- assert( pRec->is_done() );
+ assert( pRec->is_done());
m_FlatCombining.release_record( pRec );
m_FlatCombining.internal_statistics().onEnqMove();
*/
bool dequeue( value_type& val )
{
- fc_record * pRec = m_FlatCombining.acquire_record();
+ auto pRec = m_FlatCombining.acquire_record();
pRec->pValDeq = &val;
if ( c_bEliminationEnabled )
else
m_FlatCombining.combine( op_deq, pRec, *this );
- assert( pRec->is_done() );
+ assert( pRec->is_done());
m_FlatCombining.release_record( pRec );
m_FlatCombining.internal_statistics().onDequeue( pRec->bEmpty );
/// Clears the queue
void clear()
{
- fc_record * pRec = m_FlatCombining.acquire_record();
+ auto pRec = m_FlatCombining.acquire_record();
if ( c_bEliminationEnabled )
m_FlatCombining.batch_combine( op_clear, pRec, *this );
else
m_FlatCombining.combine( op_clear, pRec, *this );
- assert( pRec->is_done() );
+ assert( pRec->is_done());
m_FlatCombining.release_record( pRec );
}
/**
If the combining is in process the function waits while combining done.
*/
- bool empty()
+ bool empty() const
{
- fc_record * pRec = m_FlatCombining.acquire_record();
-
- if ( c_bEliminationEnabled )
- m_FlatCombining.batch_combine( op_empty, pRec, *this );
- else
- m_FlatCombining.combine( op_empty, pRec, *this );
-
- assert( pRec->is_done() );
- m_FlatCombining.release_record( pRec );
- return pRec->bEmpty;
+ bool bRet = false;
+ auto const& queue = m_Queue;
+ m_FlatCombining.invoke_exclusive( [&queue, &bRet]() { bRet = queue.empty(); } );
+ return bRet;
}
/// Internal statistics
{
assert( pRec );
- // this function is called under FC mutex, so switch TSan off
- CDS_TSAN_ANNOTATE_IGNORE_RW_BEGIN;
-
- switch ( pRec->op() ) {
+ switch ( pRec->op()) {
case op_enq:
assert( pRec->pValEnq );
- m_Queue.push( *(pRec->pValEnq ) );
+ m_Queue.push( *(pRec->pValEnq ));
break;
case op_enq_move:
assert( pRec->pValEnq );
- m_Queue.push( std::move( *(pRec->pValEnq )) );
+ m_Queue.push( std::move( *(pRec->pValEnq )));
break;
case op_deq:
assert( pRec->pValDeq );
pRec->bEmpty = m_Queue.empty();
if ( !pRec->bEmpty ) {
- *(pRec->pValDeq) = m_Queue.front();
+ *(pRec->pValDeq) = std::move( m_Queue.front());
m_Queue.pop();
}
break;
case op_clear:
- while ( !m_Queue.empty() )
+ while ( !m_Queue.empty())
m_Queue.pop();
break;
- case op_empty:
- pRec->bEmpty = m_Queue.empty();
- break;
default:
assert(false);
break;
}
- CDS_TSAN_ANNOTATE_IGNORE_RW_END;
}
/// Batch-processing flat combining
{
typedef typename fc_kernel::iterator fc_iterator;
- // this function is called under FC mutex, so switch TSan off
- CDS_TSAN_ANNOTATE_IGNORE_RW_BEGIN;
-
for ( fc_iterator it = itBegin, itPrev = itEnd; it != itEnd; ++it ) {
- switch ( it->op() ) {
+ switch ( it->op( atomics::memory_order_acquire )) {
case op_enq:
case op_enq_move:
case op_deq:
- if ( m_Queue.empty() ) {
+ if ( m_Queue.empty()) {
if ( itPrev != itEnd && collide( *itPrev, *it ))
itPrev = itEnd;
else
break;
}
}
- CDS_TSAN_ANNOTATE_IGNORE_RW_END;
}
//@endcond
//@cond
bool collide( fc_record& rec1, fc_record& rec2 )
{
- switch ( rec1.op() ) {
+ switch ( rec1.op()) {
case op_enq:
if ( rec2.op() == op_deq ) {
assert(rec1.pValEnq);
}
break;
case op_deq:
- switch ( rec2.op() ) {
+ switch ( rec2.op()) {
case op_enq:
case op_enq_move:
return collide( rec2, rec1 );
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