375 lines
12 KiB
C++
375 lines
12 KiB
C++
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/*
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boost::signals2::connection provides a handle to a signal/slot connection.
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Author: Frank Mori Hess <fmhess@users.sourceforge.net>
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Begin: 2007-01-23
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*/
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// Copyright Frank Mori Hess 2007-2008.
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// Distributed under the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/signals2 for library home page.
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#ifndef BOOST_SIGNALS2_CONNECTION_HPP
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#define BOOST_SIGNALS2_CONNECTION_HPP
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#include <boost/function.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/signals2/detail/auto_buffer.hpp>
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#include <boost/signals2/detail/null_output_iterator.hpp>
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#include <boost/signals2/detail/unique_lock.hpp>
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#include <boost/signals2/slot.hpp>
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#include <boost/weak_ptr.hpp>
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namespace boost
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{
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namespace signals2
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{
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inline void null_deleter(const void*) {}
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namespace detail
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{
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// This lock maintains a list of shared_ptr<void>
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// which will be destroyed only after the lock
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// has released its mutex. Used to garbage
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// collect disconnected slots
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template<typename Mutex>
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class garbage_collecting_lock: public noncopyable
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{
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public:
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garbage_collecting_lock(Mutex &m):
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lock(m)
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{}
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void add_trash(const shared_ptr<void> &piece_of_trash)
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{
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garbage.push_back(piece_of_trash);
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}
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private:
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// garbage must be declared before lock
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// to insure it is destroyed after lock is
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// destroyed.
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auto_buffer<shared_ptr<void>, store_n_objects<10> > garbage;
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unique_lock<Mutex> lock;
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};
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class connection_body_base
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{
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public:
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connection_body_base():
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_connected(true), m_slot_refcount(1)
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{
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}
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virtual ~connection_body_base() {}
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void disconnect()
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{
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garbage_collecting_lock<connection_body_base> local_lock(*this);
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nolock_disconnect(local_lock);
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}
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template<typename Mutex>
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void nolock_disconnect(garbage_collecting_lock<Mutex> &lock_arg) const
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{
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if(_connected)
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{
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_connected = false;
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dec_slot_refcount(lock_arg);
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}
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}
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virtual bool connected() const = 0;
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shared_ptr<void> get_blocker()
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{
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unique_lock<connection_body_base> local_lock(*this);
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shared_ptr<void> blocker = _weak_blocker.lock();
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if(blocker == shared_ptr<void>())
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{
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blocker.reset(this, &null_deleter);
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_weak_blocker = blocker;
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}
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return blocker;
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}
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bool blocked() const
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{
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return !_weak_blocker.expired();
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}
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bool nolock_nograb_blocked() const
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{
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return nolock_nograb_connected() == false || blocked();
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}
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bool nolock_nograb_connected() const {return _connected;}
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// expose part of Lockable concept of mutex
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virtual void lock() = 0;
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virtual void unlock() = 0;
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// Slot refcount should be incremented while
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// a signal invocation is using the slot, in order
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// to prevent slot from being destroyed mid-invocation.
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// garbage_collecting_lock parameter enforces
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// the existance of a lock before this
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// method is called
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template<typename Mutex>
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void inc_slot_refcount(const garbage_collecting_lock<Mutex> &)
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{
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BOOST_ASSERT(m_slot_refcount != 0);
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++m_slot_refcount;
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}
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// if slot refcount decrements to zero due to this call,
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// it puts a
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// shared_ptr to the slot in the garbage collecting lock,
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// which will destroy the slot only after it unlocks.
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template<typename Mutex>
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void dec_slot_refcount(garbage_collecting_lock<Mutex> &lock_arg) const
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{
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BOOST_ASSERT(m_slot_refcount != 0);
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if(--m_slot_refcount == 0)
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{
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lock_arg.add_trash(release_slot());
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}
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}
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protected:
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virtual shared_ptr<void> release_slot() const = 0;
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weak_ptr<void> _weak_blocker;
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private:
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mutable bool _connected;
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mutable unsigned m_slot_refcount;
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};
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template<typename GroupKey, typename SlotType, typename Mutex>
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class connection_body: public connection_body_base
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{
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public:
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typedef Mutex mutex_type;
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connection_body(const SlotType &slot_in, const boost::shared_ptr<mutex_type> &signal_mutex):
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m_slot(new SlotType(slot_in)), _mutex(signal_mutex)
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{
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}
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virtual ~connection_body() {}
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virtual bool connected() const
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{
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garbage_collecting_lock<mutex_type> local_lock(*_mutex);
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nolock_grab_tracked_objects(local_lock, detail::null_output_iterator());
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return nolock_nograb_connected();
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}
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const GroupKey& group_key() const {return _group_key;}
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void set_group_key(const GroupKey &key) {_group_key = key;}
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template<typename M>
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void disconnect_expired_slot(garbage_collecting_lock<M> &lock_arg)
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{
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if(!m_slot) return;
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bool expired = slot().expired();
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if(expired == true)
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{
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nolock_disconnect(lock_arg);
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}
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}
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template<typename M, typename OutputIterator>
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void nolock_grab_tracked_objects(garbage_collecting_lock<M> &lock_arg,
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OutputIterator inserter) const
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{
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if(!m_slot) return;
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slot_base::tracked_container_type::const_iterator it;
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for(it = slot().tracked_objects().begin();
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it != slot().tracked_objects().end();
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++it)
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{
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void_shared_ptr_variant locked_object
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(
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apply_visitor
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(
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detail::lock_weak_ptr_visitor(),
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*it
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)
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);
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if(apply_visitor(detail::expired_weak_ptr_visitor(), *it))
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{
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nolock_disconnect(lock_arg);
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return;
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}
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*inserter++ = locked_object;
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}
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}
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// expose Lockable concept of mutex
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virtual void lock()
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{
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_mutex->lock();
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}
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virtual void unlock()
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{
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_mutex->unlock();
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}
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SlotType &slot()
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{
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return *m_slot;
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}
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const SlotType &slot() const
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{
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return *m_slot;
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}
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protected:
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virtual shared_ptr<void> release_slot() const
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{
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shared_ptr<void> released_slot = m_slot;
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m_slot.reset();
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return released_slot;
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}
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private:
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mutable boost::shared_ptr<SlotType> m_slot;
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const boost::shared_ptr<mutex_type> _mutex;
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GroupKey _group_key;
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};
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}
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class shared_connection_block;
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class connection
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{
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public:
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friend class shared_connection_block;
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connection() {}
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connection(const connection &other): _weak_connection_body(other._weak_connection_body)
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{}
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connection(const boost::weak_ptr<detail::connection_body_base> &connectionBody):
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_weak_connection_body(connectionBody)
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{}
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// move support
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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connection(connection && other): _weak_connection_body(std::move(other._weak_connection_body))
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{
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// make sure other is reset, in case it is a scoped_connection (so it
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// won't disconnect on destruction after being moved away from).
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other._weak_connection_body.reset();
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}
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connection & operator=(connection && other)
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{
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if(&other == this) return *this;
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_weak_connection_body = std::move(other._weak_connection_body);
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// make sure other is reset, in case it is a scoped_connection (so it
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// won't disconnect on destruction after being moved away from).
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other._weak_connection_body.reset();
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return *this;
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}
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#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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connection & operator=(const connection & other)
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{
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if(&other == this) return *this;
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_weak_connection_body = other._weak_connection_body;
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return *this;
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}
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~connection() {}
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void disconnect() const
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{
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boost::shared_ptr<detail::connection_body_base> connectionBody(_weak_connection_body.lock());
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if(connectionBody == 0) return;
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connectionBody->disconnect();
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}
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bool connected() const
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{
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boost::shared_ptr<detail::connection_body_base> connectionBody(_weak_connection_body.lock());
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if(connectionBody == 0) return false;
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return connectionBody->connected();
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}
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bool blocked() const
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{
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boost::shared_ptr<detail::connection_body_base> connectionBody(_weak_connection_body.lock());
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if(connectionBody == 0) return true;
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return connectionBody->blocked();
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}
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bool operator==(const connection& other) const
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{
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boost::shared_ptr<detail::connection_body_base> connectionBody(_weak_connection_body.lock());
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boost::shared_ptr<detail::connection_body_base> otherConnectionBody(other._weak_connection_body.lock());
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return connectionBody == otherConnectionBody;
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}
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bool operator!=(const connection& other) const
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{
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return !(*this == other);
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}
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bool operator<(const connection& other) const
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{
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boost::shared_ptr<detail::connection_body_base> connectionBody(_weak_connection_body.lock());
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boost::shared_ptr<detail::connection_body_base> otherConnectionBody(other._weak_connection_body.lock());
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return connectionBody < otherConnectionBody;
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}
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void swap(connection &other)
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{
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using std::swap;
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swap(_weak_connection_body, other._weak_connection_body);
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}
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protected:
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boost::weak_ptr<detail::connection_body_base> _weak_connection_body;
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};
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inline void swap(connection &conn1, connection &conn2)
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{
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conn1.swap(conn2);
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}
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class scoped_connection: public connection
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{
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public:
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scoped_connection() {}
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scoped_connection(const connection &other):
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connection(other)
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{}
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~scoped_connection()
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{
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disconnect();
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}
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scoped_connection& operator=(const connection &rhs)
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{
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disconnect();
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connection::operator=(rhs);
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return *this;
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}
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// move support
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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scoped_connection(scoped_connection && other): connection(std::move(other))
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{
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}
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scoped_connection(connection && other): connection(std::move(other))
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{
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}
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scoped_connection & operator=(scoped_connection && other)
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{
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if(&other == this) return *this;
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disconnect();
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connection::operator=(std::move(other));
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return *this;
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}
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scoped_connection & operator=(connection && other)
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{
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if(&other == this) return *this;
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disconnect();
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connection::operator=(std::move(other));
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return *this;
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}
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#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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connection release()
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{
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connection conn(_weak_connection_body);
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_weak_connection_body.reset();
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return conn;
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}
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private:
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scoped_connection(const scoped_connection &other);
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scoped_connection& operator=(const scoped_connection &rhs);
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};
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// Sun 5.9 compiler doesn't find the swap for base connection class when
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// arguments are scoped_connection, so we provide this explicitly.
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inline void swap(scoped_connection &conn1, scoped_connection &conn2)
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{
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conn1.swap(conn2);
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}
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}
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}
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#endif // BOOST_SIGNALS2_CONNECTION_HPP
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