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2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
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11 * http://www.apache.org/licenses/LICENSE-2.0
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21
22
23
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_dbaccess.hxx"
26 #ifndef DBAUI_ASYNCRONOUSLINK_HXX
27 #include "AsyncronousLink.hxx"
28 #endif
29 #ifndef _SV_SVAPP_HXX
30 #include <vcl/svapp.hxx>
31 #endif
32 #ifndef _TOOLS_DEBUG_HXX
33 #include <tools/debug.hxx>
34 #endif
35
36 //==================================================================
37 //= OAsyncronousLink
38 //==================================================================
39 using namespace dbaui;
DBG_NAME(OAsyncronousLink)40 DBG_NAME(OAsyncronousLink)
41 //------------------------------------------------------------------
42 OAsyncronousLink::OAsyncronousLink( const Link& _rHandler )
43 :m_aHandler(_rHandler)
44 ,m_aEventSafety()
45 ,m_aDestructionSafety()
46 ,m_nEventId(0)
47 {
48 DBG_CTOR(OAsyncronousLink,NULL);
49 }
50
51 //------------------------------------------------------------------
~OAsyncronousLink()52 OAsyncronousLink::~OAsyncronousLink()
53 {
54 {
55 ::osl::MutexGuard aEventGuard( m_aEventSafety );
56 if ( m_nEventId )
57 Application::RemoveUserEvent(m_nEventId);
58 m_nEventId = 0;
59 }
60
61 {
62 ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
63 // this is just for the case we're deleted while another thread just handled the event :
64 // if this other thread called our link while we were deleting the event here, the
65 // link handler blocked. With leaving the above block it continued, but now we are prevented
66 // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves.
67 }
68 DBG_DTOR(OAsyncronousLink,NULL);
69 }
70
71
72 //------------------------------------------------------------------
Call(void * _pArgument)73 void OAsyncronousLink::Call( void* _pArgument )
74 {
75 ::osl::MutexGuard aEventGuard( m_aEventSafety );
76 if (m_nEventId)
77 Application::RemoveUserEvent(m_nEventId);
78 m_nEventId = Application::PostUserEvent( LINK( this, OAsyncronousLink, OnAsyncCall ), _pArgument );
79 }
80
81 //------------------------------------------------------------------
CancelCall()82 void OAsyncronousLink::CancelCall()
83 {
84 ::osl::MutexGuard aEventGuard( m_aEventSafety );
85 if ( m_nEventId )
86 Application::RemoveUserEvent( m_nEventId );
87 m_nEventId = 0;
88 }
89
90 //------------------------------------------------------------------
IMPL_LINK(OAsyncronousLink,OnAsyncCall,void *,_pArg)91 IMPL_LINK(OAsyncronousLink, OnAsyncCall, void*, _pArg)
92 {
93 {
94 ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
95 {
96 ::osl::MutexGuard aEventGuard( m_aEventSafety );
97 if (!m_nEventId)
98 // our destructor deleted the event just while we we're waiting for m_aEventSafety
99 // -> get outta here
100 return 0;
101 m_nEventId = 0;
102 }
103 }
104 if (m_aHandler.IsSet())
105 return m_aHandler.Call(_pArg);
106
107 return 0L;
108 }
109