Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <dbaccess/AsynchronousLink.hxx>
      21             : #include <vcl/svapp.hxx>
      22             : #include <tools/debug.hxx>
      23             : 
      24             : // OAsynchronousLink
      25             : using namespace dbaui;
      26          40 : OAsynchronousLink::OAsynchronousLink( const Link<>& _rHandler )
      27             :     :m_aHandler(_rHandler)
      28             :     ,m_aEventSafety()
      29             :     ,m_aDestructionSafety()
      30          40 :     ,m_nEventId(0)
      31             : {
      32          40 : }
      33             : 
      34          68 : OAsynchronousLink::~OAsynchronousLink()
      35             : {
      36             :     {
      37          34 :         ::osl::MutexGuard aEventGuard( m_aEventSafety );
      38          34 :         if ( m_nEventId )
      39           6 :             Application::RemoveUserEvent(m_nEventId);
      40          34 :         m_nEventId = 0;
      41             :     }
      42             : 
      43             :     {
      44          34 :         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
      45             :         // this is just for the case we're deleted while another thread just handled the event :
      46             :         // if this other thread called our link while we were deleting the event here, the
      47             :         // link handler blocked. With leaving the above block it continued, but now we are prevented
      48             :         // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves.
      49             :     }
      50          34 : }
      51             : 
      52          35 : void OAsynchronousLink::Call( void* _pArgument )
      53             : {
      54          35 :     ::osl::MutexGuard aEventGuard( m_aEventSafety );
      55          35 :     if (m_nEventId)
      56           0 :         Application::RemoveUserEvent(m_nEventId);
      57          35 :     m_nEventId = Application::PostUserEvent( LINK( this, OAsynchronousLink, OnAsyncCall ), _pArgument );
      58          35 : }
      59             : 
      60          12 : void OAsynchronousLink::CancelCall()
      61             : {
      62          12 :     ::osl::MutexGuard aEventGuard( m_aEventSafety );
      63          12 :     if ( m_nEventId )
      64          10 :         Application::RemoveUserEvent( m_nEventId );
      65          12 :     m_nEventId = 0;
      66          12 : }
      67             : 
      68          30 : IMPL_LINK(OAsynchronousLink, OnAsyncCall, void*, _pArg)
      69             : {
      70             :     {
      71          15 :         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
      72             :         {
      73          15 :             ::osl::MutexGuard aEventGuard( m_aEventSafety );
      74          15 :             if (!m_nEventId)
      75             :                 // our destructor deleted the event just while we are waiting for m_aEventSafety
      76             :                 // -> get outta here
      77           0 :                 return 0;
      78          15 :             m_nEventId = 0;
      79          15 :         }
      80             :     }
      81          15 :     if (m_aHandler.IsSet())
      82          15 :         return m_aHandler.Call(_pArg);
      83             : 
      84           0 :     return 0L;
      85             : }
      86             : 
      87             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */