swaroop: required monitors checks.

1 files changed, 102 insertions, 0 deletions

diff --git a/src/lib/monitor_checker.cc b/src/lib/monitor_checker.cc
new file mode 100644
index 000000000..c506cd09e
--- /dev/null
+++ b/src/lib/monitor_checker.cc
@@ -0,0 +1,102 @@
+/*
+    Copyright (C) 2018 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "monitor_checker.h"
+#include "config.h"
+#include "cross.h"
+
+using boost::bind;
+using boost::ref;
+
+MonitorChecker* MonitorChecker::_instance = 0;
+
+MonitorChecker::MonitorChecker ()
+	: _thread (0)
+	, _terminate (false)
+	, _ok (true)
+{
+
+}
+
+void
+MonitorChecker::run ()
+{
+	_thread = new boost::thread (boost::bind (&MonitorChecker::thread, this));
+}
+
+MonitorChecker::~MonitorChecker ()
+{
+	{
+		boost::mutex::scoped_lock lm (_mutex);
+		_terminate = true;
+	}
+
+	if (_thread) {
+		/* Ideally this would be a DCPOMATIC_ASSERT(_thread->joinable()) but we
+		   can't throw exceptions from a destructor.
+		*/
+		_thread->interrupt ();
+		try {
+			if (_thread->joinable ()) {
+				_thread->join ();
+			}
+		} catch (boost::thread_interrupted& e) {
+			/* No problem */
+		}
+	}
+	delete _thread;
+}
+
+void
+MonitorChecker::thread ()
+{
+	while (true) {
+		boost::mutex::scoped_lock lm (_mutex);
+		if (_terminate) {
+			break;
+		}
+
+		bool const was_ok = _ok;
+		_ok = Config::instance()->required_monitors().empty() || get_monitors() == Config::instance()->required_monitors();
+		if (was_ok != _ok) {
+			emit (bind(boost::ref(StateChanged)));
+		}
+
+		lm.unlock ();
+		dcpomatic_sleep (60);
+	}
+}
+
+bool
+MonitorChecker::ok () const
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	return _ok;
+}
+
+MonitorChecker *
+MonitorChecker::instance ()
+{
+	if (!_instance) {
+		_instance = new MonitorChecker ();
+	}
+
+	return _instance;
+}