src/unix/evtloopunix.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/evtloopunix.cpp
   3 // Purpose:     wxEventLoop implementation
   4 // Author:      Lukasz Michalski (lm@zork.pl)
   5 // Created:     2007-05-07
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 Zork Lukasz Michalski
   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 #if wxUSE_CONSOLE_EVENTLOOP
  23
  24 #include "wx/evtloop.h"
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/app.h"
  28     #include "wx/log.h"
  29 #endif
  30
  31 #include "wx/apptrait.h"
  32 #include "wx/scopedptr.h"
  33 #include "wx/thread.h"
  34 #include "wx/module.h"
  35 #include "wx/unix/private/timer.h"
  36 #include "wx/unix/private/epolldispatcher.h"
  37 #include "wx/unix/private/wakeuppipe.h"
  38 #include "wx/private/selectdispatcher.h"
  39
  40 #if wxUSE_EVENTLOOP_SOURCE
  41     #include "wx/evtloopsrc.h"
  42 #endif // wxUSE_EVENTLOOP_SOURCE
  43
  44 // ===========================================================================
  45 // wxEventLoop implementation
  46 // ===========================================================================
  47
  48 //-----------------------------------------------------------------------------
  49 // initialization
  50 //-----------------------------------------------------------------------------
  51
  52 wxConsoleEventLoop::wxConsoleEventLoop()
  53 {
  54     m_wakeupPipe = new wxWakeUpPipe;
  55     const int pipeFD = m_wakeupPipe->GetReadFd();
  56     if ( pipeFD == wxPipe::INVALID_FD )
  57     {
  58         wxDELETE(m_wakeupPipe);
  59         m_dispatcher = NULL;
  60         return;
  61     }
  62
  63     m_dispatcher = wxFDIODispatcher::Get();
  64     if ( !m_dispatcher )
  65         return;
  66
  67     m_dispatcher->RegisterFD(pipeFD, m_wakeupPipe, wxFDIO_INPUT);
  68 }
  69
  70 wxConsoleEventLoop::~wxConsoleEventLoop()
  71 {
  72     if ( m_wakeupPipe )
  73     {
  74         if ( m_dispatcher )
  75         {
  76             m_dispatcher->UnregisterFD(m_wakeupPipe->GetReadFd());
  77         }
  78
  79         delete m_wakeupPipe;
  80     }
  81 }
  82
  83 //-----------------------------------------------------------------------------
  84 // adding & removing sources
  85 //-----------------------------------------------------------------------------
  86
  87 #if wxUSE_EVENTLOOP_SOURCE
  88
  89 // This class is a temporary bridge between event loop sources and
  90 // FDIODispatcher. It is going to be removed soon, when all subject interfaces
  91 // are modified
  92 class wxFDIOEventLoopSourceHandler : public wxFDIOHandler
  93 {
  94 public:
  95     wxFDIOEventLoopSourceHandler(wxEventLoopSourceHandler* handler) :
  96         m_impl(handler) { }
  97
  98     virtual void OnReadWaiting()
  99     {
 100         m_impl->OnReadWaiting();
 101     }
 102     virtual void OnWriteWaiting()
 103     {
 104         m_impl->OnWriteWaiting();
 105     }
 106
 107     virtual void OnExceptionWaiting()
 108     {
 109         m_impl->OnExceptionWaiting();
 110     }
 111
 112 protected:
 113     wxEventLoopSourceHandler* m_impl;
 114 };
 115
 116 wxEventLoopSource *
 117 wxConsoleEventLoop::AddSourceForFD(int fd,
 118                                    wxEventLoopSourceHandler *handler,
 119                                    int flags)
 120 {
 121     wxCHECK_MSG( fd != -1, NULL, "can't monitor invalid fd" );
 122
 123     wxLogTrace(wxTRACE_EVT_SOURCE,
 124                 "Adding event loop source for fd=%d", fd);
 125
 126     // we need a bridge to wxFDIODispatcher
 127     //
 128     // TODO: refactor the code so that only wxEventLoopSourceHandler is used
 129     wxScopedPtr<wxFDIOHandler>
 130         fdioHandler(new wxFDIOEventLoopSourceHandler(handler));
 131
 132     if ( !m_dispatcher->RegisterFD(fd, fdioHandler.get(), flags) )
 133         return NULL;
 134
 135     return new wxUnixEventLoopSource(m_dispatcher, fdioHandler.release(),
 136                                      fd, handler, flags);
 137 }
 138
 139 wxUnixEventLoopSource::~wxUnixEventLoopSource()
 140 {
 141     wxLogTrace(wxTRACE_EVT_SOURCE,
 142                "Removing event loop source for fd=%d", m_fd);
 143
 144     m_dispatcher->UnregisterFD(m_fd);
 145
 146     delete m_fdioHandler;
 147 }
 148
 149 #endif // wxUSE_EVENTLOOP_SOURCE
 150
 151 //-----------------------------------------------------------------------------
 152 // events dispatch and loop handling
 153 //-----------------------------------------------------------------------------
 154
 155 bool wxConsoleEventLoop::Pending() const
 156 {
 157     if ( m_dispatcher->HasPending() )
 158         return true;
 159
 160 #if wxUSE_TIMER
 161     wxUsecClock_t nextTimer;
 162     if ( wxTimerScheduler::Get().GetNext(&nextTimer) &&
 163             !wxMilliClockToLong(nextTimer) )
 164         return true;
 165 #endif // wxUSE_TIMER
 166
 167     return false;
 168 }
 169
 170 bool wxConsoleEventLoop::Dispatch()
 171 {
 172     DispatchTimeout(static_cast<unsigned long>(
 173         wxFDIODispatcher::TIMEOUT_INFINITE));
 174
 175     return true;
 176 }
 177
 178 int wxConsoleEventLoop::DispatchTimeout(unsigned long timeout)
 179 {
 180 #if wxUSE_TIMER
 181     // check if we need to decrease the timeout to account for a timer
 182     wxUsecClock_t nextTimer;
 183     if ( wxTimerScheduler::Get().GetNext(&nextTimer) )
 184     {
 185         unsigned long timeUntilNextTimer = wxMilliClockToLong(nextTimer / 1000);
 186         if ( timeUntilNextTimer < timeout )
 187             timeout = timeUntilNextTimer;
 188     }
 189 #endif // wxUSE_TIMER
 190
 191     bool hadEvent = m_dispatcher->Dispatch(timeout) > 0;
 192
 193 #if wxUSE_TIMER
 194     if ( wxTimerScheduler::Get().NotifyExpired() )
 195         hadEvent = true;
 196 #endif // wxUSE_TIMER
 197
 198     return hadEvent ? 1 : -1;
 199 }
 200
 201 void wxConsoleEventLoop::WakeUp()
 202 {
 203     m_wakeupPipe->WakeUp();
 204 }
 205
 206 void wxConsoleEventLoop::OnNextIteration()
 207 {
 208     // call the signal handlers for any signals we caught recently
 209     wxTheApp->CheckSignal();
 210 }
 211
 212
 213 wxEventLoopBase *wxConsoleAppTraits::CreateEventLoop()
 214 {
 215     return new wxEventLoop();
 216 }
 217
 218 #endif // wxUSE_CONSOLE_EVENTLOOP