dbaccess/source/ui/browser/AsyncronousLink.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_dbaccess.hxx"
  33 #ifndef DBAUI_ASYNCRONOUSLINK_HXX
  34 #include "AsyncronousLink.hxx"
  35 #endif
  36 #ifndef _SV_SVAPP_HXX
  37 #include <vcl/svapp.hxx>
  38 #endif
  39 #ifndef _TOOLS_DEBUG_HXX
  40 #include <tools/debug.hxx>
  41 #endif
  42
  43 //==================================================================
  44 //= OAsyncronousLink
  45 //==================================================================
  46 using namespace dbaui;
  47 DBG_NAME(OAsyncronousLink)
  48 //------------------------------------------------------------------
  49 OAsyncronousLink::OAsyncronousLink( const Link& _rHandler )
  50     :m_aHandler(_rHandler)
  51     ,m_aEventSafety()
  52     ,m_aDestructionSafety()
  53     ,m_nEventId(0)
  54 {
  55     DBG_CTOR(OAsyncronousLink,NULL);
  56 }
  57
  58 //------------------------------------------------------------------
  59 OAsyncronousLink::~OAsyncronousLink()
  60 {
  61     {
  62         ::osl::MutexGuard aEventGuard( m_aEventSafety );
  63         if ( m_nEventId )
  64             Application::RemoveUserEvent(m_nEventId);
  65         m_nEventId = 0;
  66     }
  67
  68     {
  69         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
  70         // this is just for the case we're deleted while another thread just handled the event :
  71         // if this other thread called our link while we were deleting the event here, the
  72         // link handler blocked. With leaving the above block it continued, but now we are prevented
  73         // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves.
  74     }
  75     DBG_DTOR(OAsyncronousLink,NULL);
  76 }
  77
  78
  79 //------------------------------------------------------------------
  80 void OAsyncronousLink::Call( void* _pArgument )
  81 {
  82     ::osl::MutexGuard aEventGuard( m_aEventSafety );
  83     if (m_nEventId)
  84         Application::RemoveUserEvent(m_nEventId);
  85     m_nEventId = Application::PostUserEvent( LINK( this, OAsyncronousLink, OnAsyncCall ), _pArgument );
  86 }
  87
  88 //------------------------------------------------------------------
  89 void OAsyncronousLink::CancelCall()
  90 {
  91     ::osl::MutexGuard aEventGuard( m_aEventSafety );
  92     if ( m_nEventId )
  93         Application::RemoveUserEvent( m_nEventId );
  94     m_nEventId = 0;
  95 }
  96
  97 //------------------------------------------------------------------
  98 IMPL_LINK(OAsyncronousLink, OnAsyncCall, void*, _pArg)
  99 {
 100     {
 101         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
 102         {
 103             ::osl::MutexGuard aEventGuard( m_aEventSafety );
 104             if (!m_nEventId)
 105                 // our destructor deleted the event just while we we're waiting for m_aEventSafety
 106                 // -> get outta here
 107                 return 0;
 108             m_nEventId = 0;
 109         }
 110     }
 111     if (m_aHandler.IsSet())
 112         return m_aHandler.Call(_pArg);
 113
 114     return 0L;
 115 }