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+/* -*- 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 .
+ */
+
+#include <dbaccess/AsynchronousLink.hxx>
+#include <vcl/svapp.hxx>
+
+// OAsynchronousLink
+using namespace dbaui;
+OAsynchronousLink::OAsynchronousLink( const Link<void*,void>& _rHandler )
+ :m_aHandler(_rHandler)
+ ,m_aEventSafety()
+ ,m_aDestructionSafety()
+ ,m_nEventId(nullptr)
+{
+}
+
+OAsynchronousLink::~OAsynchronousLink()
+{
+ {
+ ::osl::MutexGuard aEventGuard( m_aEventSafety );
+ if ( m_nEventId )
+ Application::RemoveUserEvent(m_nEventId);
+ m_nEventId = nullptr;
+ }
+
+ {
+ ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
+ // this is just for the case we're deleted while another thread just handled the event :
+ // if this other thread called our link while we were deleting the event here, the
+ // link handler blocked. With leaving the above block it continued, but now we are prevented
+ // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves.
+ }
+}
+
+void OAsynchronousLink::Call( void* _pArgument )
+{
+ ::osl::MutexGuard aEventGuard( m_aEventSafety );
+ if (m_nEventId)
+ Application::RemoveUserEvent(m_nEventId);
+ m_nEventId = Application::PostUserEvent( LINK( this, OAsynchronousLink, OnAsyncCall ), _pArgument );
+}
+
+void OAsynchronousLink::CancelCall()
+{
+ ::osl::MutexGuard aEventGuard( m_aEventSafety );
+ if ( m_nEventId )
+ Application::RemoveUserEvent( m_nEventId );
+ m_nEventId = nullptr;
+}
+
+IMPL_LINK(OAsynchronousLink, OnAsyncCall, void*, _pArg, void)
+{
+ {
+ ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
+ {
+ ::osl::MutexGuard aEventGuard( m_aEventSafety );
+ if (!m_nEventId)
+ // our destructor deleted the event just while we are waiting for m_aEventSafety
+ // -> get outta here
+ return;
+ m_nEventId = nullptr;
+ }
+ }
+ m_aHandler.Call(_pArg);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */