167 lines
3.4 KiB
C++
167 lines
3.4 KiB
C++
/*
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Copyright (C) 2009-2012 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __pbd_signals_h__
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#define __pbd_signals_h__
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#include <list>
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#include <map>
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#ifdef nil
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#undef nil
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#endif
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#include <glibmm/threads.h>
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#include <boost/noncopyable.hpp>
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#include <boost/bind.hpp>
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#include <boost/bind/protect.hpp>
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#include <boost/function.hpp>
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#include <boost/enable_shared_from_this.hpp>
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#include <boost/optional.hpp>
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#include "pbd/libpbd_visibility.h"
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#include "pbd/event_loop.h"
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namespace PBD {
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class LIBPBD_API Connection;
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class LIBPBD_API SignalBase
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{
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public:
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virtual ~SignalBase () {}
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virtual void disconnect (boost::shared_ptr<Connection>) = 0;
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protected:
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Glib::Threads::Mutex _mutex;
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};
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class LIBPBD_API Connection : public boost::enable_shared_from_this<Connection>
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{
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public:
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Connection (SignalBase* b) : _signal (b) {}
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void disconnect ()
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{
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Glib::Threads::Mutex::Lock lm (_mutex);
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if (_signal) {
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_signal->disconnect (shared_from_this ());
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_signal = 0;
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}
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}
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void signal_going_away ()
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{
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Glib::Threads::Mutex::Lock lm (_mutex);
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_signal = 0;
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}
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private:
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Glib::Threads::Mutex _mutex;
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SignalBase* _signal;
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};
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template<typename R>
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class /*LIBPBD_API*/ OptionalLastValue
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{
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public:
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typedef boost::optional<R> result_type;
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template <typename Iter>
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result_type operator() (Iter first, Iter last) const {
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result_type r;
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while (first != last) {
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r = *first;
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++first;
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}
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return r;
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}
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};
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typedef boost::shared_ptr<Connection> UnscopedConnection;
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class LIBPBD_API ScopedConnection
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{
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public:
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ScopedConnection () {}
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ScopedConnection (UnscopedConnection c) : _c (c) {}
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~ScopedConnection () {
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disconnect ();
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}
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void disconnect ()
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{
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if (_c) {
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_c->disconnect ();
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}
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}
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ScopedConnection& operator= (UnscopedConnection const & o)
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{
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if (_c == o) {
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return *this;
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}
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disconnect ();
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_c = o;
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return *this;
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}
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private:
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UnscopedConnection _c;
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};
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class LIBPBD_API ScopedConnectionList : public boost::noncopyable
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{
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public:
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ScopedConnectionList();
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virtual ~ScopedConnectionList ();
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void add_connection (const UnscopedConnection& c);
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void drop_connections ();
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private:
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/* this class is not copyable */
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ScopedConnectionList(const ScopedConnectionList&);
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/* Even though our signals code is thread-safe, this additional list of
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scoped connections needs to be protected in 2 cases:
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(1) (unlikely) we make a connection involving a callback on the
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same object from 2 threads. (wouldn't that just be appalling
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programming style?)
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(2) where we are dropping connections in one thread and adding
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one from another.
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*/
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Glib::Threads::Mutex _lock;
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typedef std::list<ScopedConnection*> ConnectionList;
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ConnectionList _list;
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};
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#include "pbd/signals_generated.h"
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} /* namespace */
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#endif /* __pbd_signals_h__ */
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