1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
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: */
|
