-//$$CDS-header$$1
+/*
+ This file is a part of libcds - Concurrent Data Structures library
-#ifndef _CDS_URCU_DETAILS_SIG_THREADED_H
-#define _CDS_URCU_DETAILS_SIG_THREADED_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_URCU_DETAILS_SIG_THREADED_H
+#define CDSLIB_URCU_DETAILS_SIG_THREADED_H
#include <cds/urcu/details/sh.h>
#ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED
+#include <mutex> //unique_lock
+#include <limits>
#include <cds/urcu/dispose_thread.h>
-#include <cds/backoff_strategy.h>
+#include <cds/algo/backoff_strategy.h>
#include <cds/container/vyukov_mpmc_cycle_queue.h>
namespace cds { namespace urcu {
that provides unified RCU interface. You should use this wrapper class instead \p %signal_threaded
Template arguments:
- - \p Buffer - buffer type with FIFO semantics. Default is cds::container::VyukovMPMCCycleQueue. See \ref signal_buffered
+ - \p Buffer - buffer type with FIFO semantics. Default is \p cds::container::VyukovMPSCCycleQueue. See \ref signal_buffered
for description of buffer's interface. The buffer contains the objects of \ref epoch_retired_ptr
type that contains additional \p m_nEpoch field. This field specifies an epoch when the object
has been placed into the buffer. The \p %signal_threaded object has a global epoch counter
- that is incremented on each \p synchronize call. The epoch is used internally to prevent early deletion.
+ that is incremented on each \p synchronize() call. The epoch is used internally to prevent early deletion.
- \p Lock - mutex type, default is \p std::mutex
- \p DisposerThread - the reclamation thread class. Default is \ref cds::urcu::dispose_thread,
see the description of this class for required interface.
- \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 Lock = cds_std::mutex
+ class Buffer = cds::container::VyukovMPSCCycleQueue< epoch_retired_ptr >
+ ,class Lock = std::mutex
,class DisposerThread = dispose_thread<Buffer>
,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;
- disposer_thread m_DisposerThread;
+ buffer_type m_Buffer;
+ atomics::atomic<uint64_t> m_nCurEpoch;
+ lock_type m_Lock;
+ size_t const m_nCapacity;
+ disposer_thread m_DisposerThread;
//@endcond
public:
/// Returns singleton instance
static signal_threaded * instance()
{
- return static_cast<signal_threaded *>( base_class::instance() );
+ return static_cast<signal_threaded *>( base_class::instance());
}
/// Checks if the singleton is created and ready to use
static bool isUsed()
{}
// Return: true - synchronize has been called, false - otherwise
- bool push_buffer( epoch_retired_ptr& p )
+ bool push_buffer( epoch_retired_ptr&& p )
{
bool bPushed = m_Buffer.push( p );
- if ( !bPushed || m_Buffer.size() >= capacity() ) {
+ if ( !bPushed || m_Buffer.size() >= capacity()) {
synchronize();
- if ( !bPushed )
+ if ( !bPushed ) {
p.free();
+ }
return true;
}
return false;
static void Construct( size_t nBufferCapacity = 256, int nSignal = SIGUSR1 )
{
if ( !singleton_ptr::s_pRCU ) {
- std::unique_ptr< signal_threaded, scoped_disposer > pRCU( new signal_threaded( nBufferCapacity, nSignal ) );
+ std::unique_ptr< signal_threaded, scoped_disposer > pRCU( new signal_threaded( nBufferCapacity, nSignal ));
pRCU->m_DisposerThread.start();
singleton_ptr::s_pRCU = pRCU.release();
/// Destroys singleton object and terminates internal reclamation thread
static void Destruct( bool bDetachAll = false )
{
- if ( isUsed() ) {
+ if ( isUsed()) {
signal_threaded * pThis = instance();
if ( bDetachAll )
pThis->m_ThreadList.detach_all();
- pThis->m_DisposerThread.stop( pThis->m_Buffer, pThis->m_nCurEpoch.load( CDS_ATOMIC::memory_order_acquire ));
+ pThis->m_DisposerThread.stop( pThis->m_Buffer, std::numeric_limits< uint64_t >::max());
delete pThis;
singleton_ptr::s_pRCU = nullptr;
*/
virtual void retire_ptr( retired_ptr& p )
{
- if ( p.m_p ) {
- epoch_retired_ptr ep( p, m_nCurEpoch.load( CDS_ATOMIC::memory_order_acquire ) );
- push_buffer( ep );
- }
+ if ( p.m_p )
+ push_buffer( epoch_retired_ptr( p, m_nCurEpoch.load( atomics::memory_order_acquire )));
}
/// 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 p( *itFirst, nEpoch );
+ epoch_retired_ptr ep( *itFirst, nEpoch );
++itFirst;
- push_buffer( p );
+ 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));
+ }
+ }
+
+
/// Waits to finish a grace period and calls disposing thread
void synchronize()
{
//@cond
void synchronize( bool bSync )
{
- uint64_t nPrevEpoch = m_nCurEpoch.fetch_add( 1, CDS_ATOMIC::memory_order_release );
+ uint64_t nPrevEpoch = m_nCurEpoch.fetch_add( 1, atomics::memory_order_release );
- CDS_ATOMIC::atomic_thread_fence( CDS_ATOMIC::memory_order_acquire );
{
- cds::lock::scoped_lock<lock_type> sl( m_Lock );
+ std::unique_lock<lock_type> sl( m_Lock );
back_off bkOff;
base_class::force_membar_all_threads( bkOff );
return base_class::signal_no();
}
};
+
+
+ /// User-space signal-handled RCU with deferred threaded reclamation (stripped version)
+ /**
+ @headerfile cds/urcu/signal_threaded.h
+
+ This short version of \p signal_threaded is intended for stripping debug info.
+ If you use \p %signal_threaded with default template arguments you may use
+ this stripped version. All functionality of both classes are identical.
+ */
+ class signal_threaded_stripped: public signal_threaded<>
+ {};
+
}} // namespace cds::urcu
#endif // #ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED
-#endif // #ifndef _CDS_URCU_DETAILS_SIG_THREADED_H
+#endif // #ifndef CDSLIB_URCU_DETAILS_SIG_THREADED_H
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