89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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Copyright (C) 2009 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_event_loop_h__
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#define __pbd_event_loop_h__
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#include <boost/function.hpp>
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#include <boost/bind.hpp> /* we don't need this here, but anything calling call_slot() probably will, so this is convenient */
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#include <glibmm/threads.h>
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#include "pbd/libpbd_visibility.h"
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namespace PBD
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{
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/** An EventLoop is as basic abstraction designed to be used with any "user
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* interface" (not necessarily graphical) that needs to wait on
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* events/requests and dispatch/process them as they arrive.
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*
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* This is a very basic class that doesn't by itself provide an actual
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* event loop or thread. See BaseUI for the "real" object to be used
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* when something like this is needed (it inherits from EventLoop).
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*/
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class LIBPBD_API EventLoop
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{
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public:
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EventLoop() {}
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virtual ~EventLoop() {}
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enum RequestType {
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range_guarantee = ~0
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};
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struct BaseRequestObject;
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struct InvalidationRecord {
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std::list<BaseRequestObject*> requests;
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PBD::EventLoop* event_loop;
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const char* file;
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int line;
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InvalidationRecord() : event_loop (0) {}
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};
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static void* invalidate_request (void* data);
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struct BaseRequestObject {
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RequestType type;
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bool valid;
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InvalidationRecord* invalidation;
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boost::function<void()> the_slot;
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BaseRequestObject() : valid (true), invalidation (0) {}
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};
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virtual void call_slot (InvalidationRecord*, const boost::function<void()>&) = 0;
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virtual Glib::Threads::Mutex& slot_invalidation_mutex() = 0;
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static EventLoop* get_event_loop_for_thread();
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static void set_event_loop_for_thread (EventLoop* ui);
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private:
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static Glib::Threads::Private<EventLoop> thread_event_loop;
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};
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}
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#define MISSING_INVALIDATOR 0 // used to mark places where we fail to provide an invalidator
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#endif /* __pbd_event_loop_h__ */
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