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-rw-r--r--ingen/client/ThreadedSigClientInterface.hpp95
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-/*
- This file is part of Ingen.
- Copyright 2007-2015 David Robillard <http://drobilla.net/>
-
- Ingen is free software: you can redistribute it and/or modify it under the
- terms of the GNU Affero General Public License as published by the Free
- Software Foundation, either version 3 of the License, or any later version.
-
- Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU Affero General Public License for details.
-
- You should have received a copy of the GNU Affero General Public License
- along with Ingen. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef INGEN_CLIENT_THREADEDSIGCLIENTINTERFACE_HPP
-#define INGEN_CLIENT_THREADEDSIGCLIENTINTERFACE_HPP
-
-#include <cstdint>
-#include <mutex>
-#include <string>
-#include <vector>
-
-#undef nil
-#include <sigc++/sigc++.h>
-
-#include "ingen/Atom.hpp"
-#include "ingen/Interface.hpp"
-#include "ingen/client/SigClientInterface.hpp"
-#include "ingen/ingen.h"
-
-/** Returns nothing and takes no parameters (because they have all been bound) */
-typedef sigc::slot<void> Closure;
-
-namespace Ingen {
-
-class Interface;
-
-namespace Client {
-
-/** A LibSigC++ signal emitting interface for clients to use.
- *
- * This emits signals (possibly) in a different thread than the ClientInterface
- * functions are called. It must be explicitly driven with the emit_signals()
- * function, which fires all enqueued signals up until the present. You can
- * use this in a GTK idle callback for receiving thread safe engine signals.
- *
- * @ingroup IngenClient
- */
-class INGEN_API ThreadedSigClientInterface : public SigClientInterface
-{
-public:
- ThreadedSigClientInterface()
- : message_slot(_signal_message.make_slot())
- {}
-
- URI uri() const override { return URI("ingen:/clients/sig_queue"); }
-
- void message(const Message& msg) override {
- std::lock_guard<std::mutex> lock(_mutex);
- _sigs.push_back(sigc::bind(message_slot, msg));
- }
-
- /** Process all queued events - Called from GTK thread to emit signals. */
- bool emit_signals() override {
- // Get pending signals
- std::vector<Closure> sigs;
- {
- std::lock_guard<std::mutex> lock(_mutex);
- std::swap(sigs, _sigs);
- }
-
- for (auto& ev : sigs) {
- ev();
- ev.disconnect();
- }
-
- return true;
- }
-
-private:
- std::mutex _mutex;
- std::vector<Closure> _sigs;
-
- using Graph = Resource::Graph;
- using Path = Raul::Path;
-
- sigc::slot<void, Message> message_slot;
-};
-
-} // namespace Client
-} // namespace Ingen
-
-#endif