--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/3rdparty/vmime/src/vmime/utility/sync/criticalSection.hpp	Tue Aug 17 11:19:54 2021 +0200
@@ -0,0 +1,65 @@
+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002-2013 Vincent Richard <vincent@vmime.org>
+//
+// This program 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 3 of
+// the License, or (at your option) any later version.
+//
+// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#ifndef VMIME_UTILITY_SYNC_CRITICALSECTION_HPP_INCLUDED
+#define VMIME_UTILITY_SYNC_CRITICALSECTION_HPP_INCLUDED
+
+
+#include "vmime/base.hpp"
+
+
+namespace vmime {
+namespace utility {
+namespace sync {
+
+
+/** Critical section class.
+  */
+
+class VMIME_EXPORT criticalSection : public object
+{
+public:
+
+	virtual ~criticalSection();
+
+	/** Enters the critical section.
+	  */
+	virtual void lock() = 0;
+
+	/** Leaves the critical section.
+	  */
+	virtual void unlock() = 0;
+
+protected:
+
+	criticalSection();
+	criticalSection(criticalSection&);
+};
+
+
+} // sync
+} // utility
+} // vmime
+
+
+#endif // VMIME_UTILITY_SYNC_CRITICALSECTION_HPP_INCLUDED