Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/include/dbaccess/AsynchronousLink.hxx b/include/dbaccess/AsynchronousLink.hxx
new file mode 100644
index 000000000..0b63cbed9
--- /dev/null
+++ b/include/dbaccess/AsynchronousLink.hxx
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <osl/mutex.hxx>
+#include <tools/link.hxx>
+
+struct ImplSVEvent;
+
+namespace dbaui
+{
+
+    // a helper for multi-threaded handling of async events
+
+    /** handles asynchronous links which may be called in multi-threaded environments
+        If you use an instance of this class as member of your own class, it will handle
+        several crucial points for you (for instance the case that somebody posts the
+        event while another thread tries to delete this event in the _destructor_ of the
+        class).
+    */
+    class OAsynchronousLink final
+    {
+        Link<void*,void>    m_aHandler;
+        ::osl::Mutex        m_aEventSafety;
+        ::osl::Mutex        m_aDestructionSafety;
+        ImplSVEvent *       m_nEventId;
+        DECL_LINK(OnAsyncCall, void*, void);
+
+    public:
+        /** constructs the object
+            @param      _rHandler           The link to be called asynchronously
+        */
+        OAsynchronousLink( const Link<void*,void>& _rHandler );
+        ~OAsynchronousLink();
+
+        bool    IsRunning() const { return m_nEventId != nullptr; }
+
+        void Call( void* _pArgument = nullptr );
+        void CancelCall();
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */