2 Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 /** @file src/job_manager.h
22 * @brief A simple scheduler for jobs.
25 #include "signaller.h"
26 #include <boost/thread/mutex.hpp>
27 #include <boost/thread.hpp>
28 #include <boost/signals2.hpp>
29 #include <boost/thread/condition.hpp>
36 extern bool wait_for_jobs ();
39 * @brief A simple scheduler for jobs.
41 class JobManager : public Signaller, public boost::noncopyable
44 boost::shared_ptr<Job> add (boost::shared_ptr<Job>);
45 boost::shared_ptr<Job> add_after (boost::shared_ptr<Job> after, boost::shared_ptr<Job> j);
46 std::list<boost::shared_ptr<Job> > get () const;
47 bool work_to_do () const;
49 void increase_priority (boost::shared_ptr<Job>);
50 void decrease_priority (boost::shared_ptr<Job>);
53 bool paused () const {
54 boost::mutex::scoped_lock lm (_mutex);
59 boost::shared_ptr<const Film> film,
60 boost::shared_ptr<const Playlist> playlist,
62 boost::signals2::connection& connection,
63 boost::function<void()> ready
66 boost::signals2::signal<void (boost::weak_ptr<Job>)> JobAdded;
67 boost::signals2::signal<void ()> JobsReordered;
68 boost::signals2::signal<void (boost::optional<std::string>, boost::optional<std::string>)> ActiveJobsChanged;
70 static JobManager* instance ();
74 /* This function is part of the test suite */
75 friend bool ::wait_for_jobs ();
81 void priority_changed ();
84 mutable boost::mutex _mutex;
85 boost::condition _empty_condition;
86 /** List of jobs in the order that they will be executed */
87 std::list<boost::shared_ptr<Job> > _jobs;
88 std::list<boost::signals2::connection> _connections;
91 boost::shared_ptr<Job> _paused_job;
93 boost::optional<std::string> _last_active_job;
94 boost::thread* _scheduler;
96 static JobManager* _instance;