src/common/fdiodispatcher.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/fdiodispatcher.cpp
   3 // Purpose:     Implementation of common wxFDIODispatcher methods
   4 // Author:      Vadim Zeitlin
   5 // Created:     2007-05-13
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/module.h"
  28 #endif //WX_PRECOMP
  29
  30 #include "wx/private/fdiodispatcher.h"
  31
  32 #include "wx/private/selectdispatcher.h"
  33 #ifdef __UNIX__
  34     #include "wx/unix/private/epolldispatcher.h"
  35 #endif
  36
  37 wxFDIODispatcher *gs_dispatcher = NULL;
  38
  39 // ============================================================================
  40 // implementation
  41 // ============================================================================
  42
  43 // ----------------------------------------------------------------------------
  44 // wxFDIODispatcher
  45 // ----------------------------------------------------------------------------
  46
  47 /* static */
  48 wxFDIODispatcher *wxFDIODispatcher::Get()
  49 {
  50     if ( !gs_dispatcher )
  51     {
  52 #if wxUSE_EPOLL_DISPATCHER
  53         gs_dispatcher = wxEpollDispatcher::Create();
  54         if ( !gs_dispatcher )
  55 #endif // wxUSE_EPOLL_DISPATCHER
  56 #if wxUSE_SELECT_DISPATCHER
  57             gs_dispatcher = new wxSelectDispatcher();
  58 #endif // wxUSE_SELECT_DISPATCHER
  59     }
  60
  61     wxASSERT_MSG( gs_dispatcher, "failed to create any IO dispatchers" );
  62
  63     return gs_dispatcher;
  64 }
  65
  66 /* static */
  67 void wxFDIODispatcher::DispatchPending()
  68 {
  69     if ( gs_dispatcher )
  70         gs_dispatcher->Dispatch(0);
  71 }
  72
  73 // ----------------------------------------------------------------------------
  74 // wxMappedFDIODispatcher
  75 // ----------------------------------------------------------------------------
  76
  77 wxFDIOHandler *wxMappedFDIODispatcher::FindHandler(int fd) const
  78 {
  79     const wxFDIOHandlerMap::const_iterator it = m_handlers.find(fd);
  80
  81     return it == m_handlers.end() ? NULL : it->second.handler;
  82 }
  83
  84
  85 bool
  86 wxMappedFDIODispatcher::RegisterFD(int fd, wxFDIOHandler *handler, int flags)
  87 {
  88     wxCHECK_MSG( handler, false, "handler can't be NULL" );
  89
  90     // notice that it's not an error to register a handler for the same fd
  91     // twice as it can be done with different flags -- but it is an error to
  92     // register different handlers
  93     wxFDIOHandlerMap::iterator i = m_handlers.find(fd);
  94     if ( i != m_handlers.end() )
  95     {
  96         wxASSERT_MSG( i->second.handler == handler,
  97                         "registering different handler for the same fd?" );
  98         wxASSERT_MSG( i->second.flags != flags,
  99                         "reregistering with the same flags?" );
 100     }
 101
 102     m_handlers[fd] = wxFDIOHandlerEntry(handler, flags);
 103
 104     return true;
 105 }
 106
 107 bool
 108 wxMappedFDIODispatcher::ModifyFD(int fd, wxFDIOHandler *handler, int flags)
 109 {
 110     wxCHECK_MSG( handler, false, "handler can't be NULL" );
 111
 112     wxFDIOHandlerMap::iterator i = m_handlers.find(fd);
 113     wxCHECK_MSG( i != m_handlers.end(), false,
 114                     "modifying unregistered handler?" );
 115
 116     i->second = wxFDIOHandlerEntry(handler, flags);
 117
 118     return true;
 119 }
 120
 121 bool wxMappedFDIODispatcher::UnregisterFD(int fd)
 122 {
 123     wxFDIOHandlerMap::iterator i = m_handlers.find(fd);
 124     if ( i == m_handlers.end() )
 125       return false;
 126
 127     m_handlers.erase(i);
 128
 129     return true;
 130 }
 131
 132 // ----------------------------------------------------------------------------
 133 // wxSelectDispatcherModule
 134 // ----------------------------------------------------------------------------
 135
 136 class wxFDIODispatcherModule : public wxModule
 137 {
 138 public:
 139     virtual bool OnInit() { return true; }
 140     virtual void OnExit() { wxDELETE(gs_dispatcher); }
 141
 142 private:
 143     DECLARE_DYNAMIC_CLASS(wxFDIODispatcherModule)
 144 };
 145
 146 IMPLEMENT_DYNAMIC_CLASS(wxFDIODispatcherModule, wxModule)