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+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file progress.h Functions related to modal progress. */
+
+#ifndef PROGRESS_H
+#define PROGRESS_H
+
+static const uint MODAL_PROGRESS_REDRAW_TIMEOUT = 200; ///< Timeout between redraws
+
+/**
+ * Check if we are currently in a modal progress state.
+ * @return Are we in the modal state?
+ */
+static inline bool HasModalProgress()
+{
+ extern bool _in_modal_progress;
+ return _in_modal_progress;
+}
+
+/**
+ * Set the modal progress state.
+ * @param state The new state; are we modal or not?
+ */
+void SetModalProgress(bool state);
+
+extern class ThreadMutex *_modal_progress_work_mutex;
+extern class ThreadMutex *_modal_progress_paint_mutex;
+
+#endif /* PROGRESS_H */