2 files changed, 76 insertions, 0 deletions
diff --git a/src/lib/atomicity_checker.cc b/src/lib/atomicity_checker.cc
new file mode 100644
index 000000000..922aa152a
--- /dev/null
+++ b/src/lib/atomicity_checker.cc
@@ -0,0 +1,43 @@
+/*
+    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 "atomicity_checker.h"
+#include "types.h"
+
+/** @return true if this change should be ignored */
+bool
+AtomicityChecker::send (ChangeType type, int property)
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	switch (type) {
+	case CHANGE_TYPE_PENDING:
+		_await.insert (property);
+		return false;
+	case CHANGE_TYPE_DONE:
+	case CHANGE_TYPE_CANCELLED:
+		if (_await.find(property) != _await.end()) {
+			_await.erase (property);
+			return false;
+		}
+		return true;
+	}
+
+	return false;
+}
diff --git a/src/lib/atomicity_checker.h b/src/lib/atomicity_checker.h
new file mode 100644
index 000000000..5a47235ad
--- /dev/null
+++ b/src/lib/atomicity_checker.h
@@ -0,0 +1,33 @@
+/*
+    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 "types.h"
+#include <boost/thread/mutex.hpp>
+#include <set>
+
+class AtomicityChecker
+{
+public:
+	bool send (ChangeType type, int property);
+
+private:
+	boost::mutex _mutex;
+	std::set<int> _await;
+};