1 /************************************************************************* 2 * 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * Copyright 2000, 2010 Oracle and/or its affiliates. 6 * 7 * OpenOffice.org - a multi-platform office productivity suite 8 * 9 * This file is part of OpenOffice.org. 10 * 11 * OpenOffice.org is free software: you can redistribute it and/or modify 12 * it under the terms of the GNU Lesser General Public License version 3 13 * only, as published by the Free Software Foundation. 14 * 15 * OpenOffice.org is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU Lesser General Public License version 3 for more details 19 * (a copy is included in the LICENSE file that accompanied this code). 20 * 21 * You should have received a copy of the GNU Lesser General Public License 22 * version 3 along with OpenOffice.org. If not, see 23 * <http://www.openoffice.org/license.html> 24 * for a copy of the LGPLv3 License. 25 * 26 ************************************************************************/ 27 28 // MARKER(update_precomp.py): autogen include statement, do not remove 29 #include "precompiled_dbaccess.hxx" 30 #ifndef DBAUI_ASYNCRONOUSLINK_HXX 31 #include "AsyncronousLink.hxx" 32 #endif 33 #ifndef _SV_SVAPP_HXX 34 #include <vcl/svapp.hxx> 35 #endif 36 #ifndef _TOOLS_DEBUG_HXX 37 #include <tools/debug.hxx> 38 #endif 39 40 //================================================================== 41 //= OAsyncronousLink 42 //================================================================== 43 using namespace dbaui; 44 DBG_NAME(OAsyncronousLink) 45 //------------------------------------------------------------------ 46 OAsyncronousLink::OAsyncronousLink( const Link& _rHandler ) 47 :m_aHandler(_rHandler) 48 ,m_aEventSafety() 49 ,m_aDestructionSafety() 50 ,m_nEventId(0) 51 { 52 DBG_CTOR(OAsyncronousLink,NULL); 53 } 54 55 //------------------------------------------------------------------ 56 OAsyncronousLink::~OAsyncronousLink() 57 { 58 { 59 ::osl::MutexGuard aEventGuard( m_aEventSafety ); 60 if ( m_nEventId ) 61 Application::RemoveUserEvent(m_nEventId); 62 m_nEventId = 0; 63 } 64 65 { 66 ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety ); 67 // this is just for the case we're deleted while another thread just handled the event : 68 // if this other thread called our link while we were deleting the event here, the 69 // link handler blocked. With leaving the above block it continued, but now we are prevented 70 // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves. 71 } 72 DBG_DTOR(OAsyncronousLink,NULL); 73 } 74 75 76 //------------------------------------------------------------------ 77 void OAsyncronousLink::Call( void* _pArgument ) 78 { 79 ::osl::MutexGuard aEventGuard( m_aEventSafety ); 80 if (m_nEventId) 81 Application::RemoveUserEvent(m_nEventId); 82 m_nEventId = Application::PostUserEvent( LINK( this, OAsyncronousLink, OnAsyncCall ), _pArgument ); 83 } 84 85 //------------------------------------------------------------------ 86 void OAsyncronousLink::CancelCall() 87 { 88 ::osl::MutexGuard aEventGuard( m_aEventSafety ); 89 if ( m_nEventId ) 90 Application::RemoveUserEvent( m_nEventId ); 91 m_nEventId = 0; 92 } 93 94 //------------------------------------------------------------------ 95 IMPL_LINK(OAsyncronousLink, OnAsyncCall, void*, _pArg) 96 { 97 { 98 ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety ); 99 { 100 ::osl::MutexGuard aEventGuard( m_aEventSafety ); 101 if (!m_nEventId) 102 // our destructor deleted the event just while we we're waiting for m_aEventSafety 103 // -> get outta here 104 return 0; 105 m_nEventId = 0; 106 } 107 } 108 if (m_aHandler.IsSet()) 109 return m_aHandler.Call(_pArg); 110 111 return 0L; 112 } 113