-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
-#ifndef _CDS_URCU_DETAILS_SIG_BUFFERED_H
-#define _CDS_URCU_DETAILS_SIG_BUFFERED_H
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
+
+ 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_URCU_DETAILS_SIG_BUFFERED_H
+#define CDSLIB_URCU_DETAILS_SIG_BUFFERED_H
#include <cds/urcu/details/sh.h>
#ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED
#include <mutex>
+#include <limits>
#include <cds/algo/backoff_strategy.h>
#include <cds/container/vyukov_mpmc_cycle_queue.h>
- \p Backoff - back-off schema, default is cds::backoff::Default
*/
template <
- class Buffer = cds::container::VyukovMPMCCycleQueue<
- epoch_retired_ptr
- ,cds::opt::buffer< cds::opt::v::dynamic_buffer< epoch_retired_ptr > >
- >
+ class Buffer = cds::container::VyukovMPMCCycleQueue< epoch_retired_ptr >
,class Lock = std::mutex
,class Backoff = cds::backoff::Default
>
protected:
//@cond
- buffer_type m_Buffer;
- CDS_ATOMIC::atomic<uint64_t> m_nCurEpoch;
- lock_type m_Lock;
- size_t const m_nCapacity;
+ buffer_type m_Buffer;
+ atomics::atomic<uint64_t> m_nCurEpoch;
+ lock_type m_Lock;
+ size_t const m_nCapacity;
//@endcond
public:
/// Returns singleton instance
static signal_buffered * instance()
{
- return static_cast<signal_buffered *>( base_class::instance() );
+ return static_cast<signal_buffered *>( base_class::instance());
}
/// Checks if the singleton is created and ready to use
static bool isUsed()
~signal_buffered()
{
- clear_buffer( (uint64_t) -1 );
+ clear_buffer( std::numeric_limits< uint64_t >::max());
}
void clear_buffer( uint64_t nEpoch )
{
epoch_retired_ptr p;
while ( m_Buffer.pop( p )) {
- if ( p.m_nEpoch <= nEpoch )
+ if ( p.m_nEpoch <= nEpoch ) {
p.free();
+ }
else {
- push_buffer( p );
+ push_buffer( std::move(p));
break;
}
}
}
- bool push_buffer( epoch_retired_ptr& ep )
+ bool push_buffer( epoch_retired_ptr&& ep )
{
bool bPushed = m_Buffer.push( ep );
- if ( !bPushed || m_Buffer.size() >= capacity() ) {
+ if ( !bPushed || m_Buffer.size() >= capacity()) {
synchronize();
- if ( !bPushed )
+ if ( !bPushed ) {
ep.free();
+ }
return true;
}
return false;
/// Destroys singleton object
static void Destruct( bool bDetachAll = false )
{
- if ( isUsed() ) {
- instance()->clear_buffer( (uint64_t) -1 );
+ if ( isUsed()) {
+ instance()->clear_buffer( std::numeric_limits< uint64_t >::max());
if ( bDetachAll )
instance()->m_ThreadList.detach_all();
delete instance();
*/
virtual void retire_ptr( retired_ptr& p )
{
- if ( p.m_p ) {
- epoch_retired_ptr ep( p, m_nCurEpoch.load( CDS_ATOMIC::memory_order_relaxed ));
- push_buffer( ep );
- }
+ if ( p.m_p )
+ push_buffer( epoch_retired_ptr( p, m_nCurEpoch.load( atomics::memory_order_relaxed )));
}
/// Retires the pointer chain [\p itFirst, \p itLast)
template <typename ForwardIterator>
void batch_retire( ForwardIterator itFirst, ForwardIterator itLast )
{
- uint64_t nEpoch = m_nCurEpoch.load( CDS_ATOMIC::memory_order_relaxed );
+ uint64_t nEpoch = m_nCurEpoch.load( atomics::memory_order_relaxed );
while ( itFirst != itLast ) {
epoch_retired_ptr ep( *itFirst, nEpoch );
++itFirst;
- push_buffer( ep );
+ push_buffer( std::move(ep));
+ }
+ }
+
+ /// Retires the pointer chain until \p Func returns \p nullptr retired pointer
+ template <typename Func>
+ void batch_retire( Func e )
+ {
+ uint64_t nEpoch = m_nCurEpoch.load( atomics::memory_order_relaxed );
+ for ( retired_ptr p{ e() }; p.m_p; ) {
+ epoch_retired_ptr ep( p, nEpoch );
+ p = e();
+ push_buffer( std::move(ep));
}
}
/// Wait to finish a grace period and then clear the buffer
void synchronize()
{
- epoch_retired_ptr ep( retired_ptr(), m_nCurEpoch.load( CDS_ATOMIC::memory_order_relaxed ));
+ epoch_retired_ptr ep( retired_ptr(), m_nCurEpoch.load( atomics::memory_order_relaxed ));
synchronize( ep );
}
bool synchronize( epoch_retired_ptr& ep )
{
uint64_t nEpoch;
- CDS_ATOMIC::atomic_thread_fence( CDS_ATOMIC::memory_order_acquire );
+ atomics::atomic_thread_fence( atomics::memory_order_acquire );
{
- cds::lock::scoped_lock<lock_type> sl( m_Lock );
+ std::unique_lock<lock_type> sl( m_Lock );
if ( ep.m_p && m_Buffer.push( ep ) && m_Buffer.size() < capacity())
return false;
- nEpoch = m_nCurEpoch.fetch_add( 1, CDS_ATOMIC::memory_order_relaxed );
+ nEpoch = m_nCurEpoch.fetch_add( 1, atomics::memory_order_relaxed );
back_off bkOff;
base_class::force_membar_all_threads( bkOff );
}
};
+
+ /// User-space signal-handled RCU with deferred (buffered) reclamation (stripped version)
+ /**
+ @headerfile cds/urcu/signal_buffered.h
+
+ This short version of \p signal_buffered is intended for stripping debug info.
+ If you use \p %signal_buffered with default template arguments you may use
+ this stripped version. All functionality of both classes are identical.
+ */
+ class signal_buffered_stripped: public signal_buffered<>
+ {};
+
}} // namespace cds::urcu
#endif // #ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED
-#endif // #ifndef _CDS_URCU_DETAILS_SIG_BUFFERED_H
+#endif // #ifndef CDSLIB_URCU_DETAILS_SIG_BUFFERED_H
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