2 Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <boost/signals2.hpp>
21 #include <boost/thread/mutex.hpp>
22 #include <curl/curl.h>
40 boost::mutex::scoped_lock lm (_data_mutex);
44 std::string stable () {
45 boost::mutex::scoped_lock lm (_data_mutex);
49 /** @return true if this check was run at startup, otherwise false */
50 bool startup () const {
51 boost::mutex::scoped_lock lm (_data_mutex);
55 size_t write_callback (void *, size_t, size_t);
57 boost::signals2::signal<void (void)> StateChanged;
59 static UpdateChecker* instance ();
62 static UpdateChecker* _instance;
64 void set_state (State);
70 /** mutex to protect _state, _stable and _startup */
71 mutable boost::mutex _data_mutex;
74 /** true if this check was run at startup, otherwise false */
77 /** mutex to ensure that only one query runs at once */
78 boost::mutex _single_thread_mutex;