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Diffstat (limited to '')
-rw-r--r-- | dbaccess/source/ui/browser/AsynchronousLink.cxx | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/dbaccess/source/ui/browser/AsynchronousLink.cxx b/dbaccess/source/ui/browser/AsynchronousLink.cxx new file mode 100644 index 000000000..c8a7e500f --- /dev/null +++ b/dbaccess/source/ui/browser/AsynchronousLink.cxx @@ -0,0 +1,83 @@ +/* -*- 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: */ |