dbaccess/source/ui/browser/AsyncronousLink.cxx

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  28
  29 #include "AsyncronousLink.hxx"
  30 #include <vcl/svapp.hxx>
  31 #include <tools/debug.hxx>
  32
  33 //==================================================================
  34 //= OAsyncronousLink
  35 //==================================================================
  36 using namespace dbaui;
  37 DBG_NAME(OAsyncronousLink)
  38 //------------------------------------------------------------------
  39 OAsyncronousLink::OAsyncronousLink( const Link& _rHandler )
  40     :m_aHandler(_rHandler)
  41     ,m_aEventSafety()
  42     ,m_aDestructionSafety()
  43     ,m_nEventId(0)
  44 {
  45     DBG_CTOR(OAsyncronousLink,NULL);
  46 }
  47
  48 //------------------------------------------------------------------
  49 OAsyncronousLink::~OAsyncronousLink()
  50 {
  51     {
  52         ::osl::MutexGuard aEventGuard( m_aEventSafety );
  53         if ( m_nEventId )
  54             Application::RemoveUserEvent(m_nEventId);
  55         m_nEventId = 0;
  56     }
  57
  58     {
  59         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
  60         // this is just for the case we're deleted while another thread just handled the event :
  61         // if this other thread called our link while we were deleting the event here, the
  62         // link handler blocked. With leaving the above block it continued, but now we are prevented
  63         // to leave this destructor 'til the link handler recognizes that nEvent == 0 and leaves.
  64     }
  65     DBG_DTOR(OAsyncronousLink,NULL);
  66 }
  67
  68
  69 //------------------------------------------------------------------
  70 void OAsyncronousLink::Call( void* _pArgument )
  71 {
  72     ::osl::MutexGuard aEventGuard( m_aEventSafety );
  73     if (m_nEventId)
  74         Application::RemoveUserEvent(m_nEventId);
  75     m_nEventId = Application::PostUserEvent( LINK( this, OAsyncronousLink, OnAsyncCall ), _pArgument );
  76 }
  77
  78 //------------------------------------------------------------------
  79 void OAsyncronousLink::CancelCall()
  80 {
  81     ::osl::MutexGuard aEventGuard( m_aEventSafety );
  82     if ( m_nEventId )
  83         Application::RemoveUserEvent( m_nEventId );
  84     m_nEventId = 0;
  85 }
  86
  87 //------------------------------------------------------------------
  88 IMPL_LINK(OAsyncronousLink, OnAsyncCall, void*, _pArg)
  89 {
  90     {
  91         ::osl::MutexGuard aDestructionGuard( m_aDestructionSafety );
  92         {
  93             ::osl::MutexGuard aEventGuard( m_aEventSafety );
  94             if (!m_nEventId)
  95                 // our destructor deleted the event just while we we're waiting for m_aEventSafety
  96                 // -> get outta here
  97                 return 0;
  98             m_nEventId = 0;
  99         }
 100     }
 101     if (m_aHandler.IsSet())
 102         return m_aHandler.Call(_pArg);
 103
 104     return 0L;
 105 }
 106
 107 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */