implement event loop for console applications (heavily modified patch 1715735)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/evtloop.h

@@ -0,0 +1,71 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/unix/evtloop.h
+// Purpose:     declares wxEventLoop class
+// Author:      Lukasz Michalski (lm@zork.pl)
+// Created:     2007-05-07
+// RCS-ID:      $Id$
+// Copyright:   (c) 2007 Lukasz Michalski
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_UNIX_EVTLOOP_H_
+#define _WX_UNIX_EVTLOOP_H_
+
+#include "wx/private/fdiodispatcher.h"
+#include "wx/unix/private/timer.h"
+#include "wx/unix/pipe.h"
+
+// ----------------------------------------------------------------------------
+// wxEventLoop
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxConsoleEventLoop : public wxEventLoopManual
+{
+public:
+    // initialize the event loop, use IsOk() to check if we were successful
+    wxConsoleEventLoop();
+
+    // implement base class pure virtuals
+    virtual bool Pending() const;
+    virtual bool Dispatch();
+    virtual void WakeUp();
+    virtual bool IsOk() const { return m_dispatcher != NULL; }
+
+protected:
+    virtual void OnNextIteration();
+
+private:
+    // pipe used for wake up messages: when a child thread wants to wake up
+    // the event loop in the main thread it writes to this pipe
+    class PipeIOHandler : public wxFDIOHandler
+    {
+    public:
+        // default ctor does nothing, call Create() to really initialize the
+        // object
+        PipeIOHandler() { }
+
+        bool Create();
+
+        // this method can be, and normally is, called from another thread
+        void WakeUp();
+
+        int GetReadFd() { return m_pipe[wxPipe::Read]; }
+
+        // implement wxFDIOHandler pure virtual methods
+        virtual void OnReadWaiting();
+        virtual void OnWriteWaiting() { }
+        virtual void OnExceptionWaiting() { }
+
+    private:
+        wxPipe m_pipe;
+    };
+
+    PipeIOHandler m_wakeupPipe;
+
+    // either wxSelectDispatcher or wxEpollDispatcher
+    wxFDIODispatcher *m_dispatcher;
+
+    DECLARE_NO_COPY_CLASS(wxConsoleEventLoop)
+};
+
+#endif // _WX_UNIX_EVTLOOP_H_