8b4ae731d3
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76220 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/private/fdiodispatcher.h
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// Purpose: classes for dispatching IO notifications for file descriptors
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// Authors: Lukasz Michalski
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// Created: December 2006
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// Copyright: (c) Lukasz Michalski
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_PRIVATE_FDIODISPATCHER_H_
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#define _WX_PRIVATE_FDIODISPATCHER_H_
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#include "wx/hashmap.h"
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#include "wx/private/fdiohandler.h"
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// those flags describes sets where descriptor should be added
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enum wxFDIODispatcherEntryFlags
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{
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wxFDIO_INPUT = 1,
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wxFDIO_OUTPUT = 2,
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wxFDIO_EXCEPTION = 4,
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wxFDIO_ALL = wxFDIO_INPUT | wxFDIO_OUTPUT | wxFDIO_EXCEPTION
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};
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// base class for wxSelectDispatcher and wxEpollDispatcher
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class WXDLLIMPEXP_BASE wxFDIODispatcher
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{
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public:
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enum { TIMEOUT_INFINITE = -1 };
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// return the global dispatcher to be used for IO events, can be NULL only
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// if wxSelectDispatcher wasn't compiled into the library at all as
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// creating it never fails
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//
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// don't delete the returned pointer
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static wxFDIODispatcher *Get();
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// if we have any registered handlers, check for any pending events to them
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// and dispatch them -- this is used from wxX11 and wxDFB event loops
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// implementation
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static void DispatchPending();
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// register handler for the given descriptor with the dispatcher, return
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// true on success or false on error
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virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags) = 0;
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// modify descriptor flags or handler, return true on success
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virtual bool ModifyFD(int fd, wxFDIOHandler *handler, int flags) = 0;
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// unregister descriptor previously registered with RegisterFD()
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virtual bool UnregisterFD(int fd) = 0;
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// check if any events are currently available without dispatching them
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virtual bool HasPending() const = 0;
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// wait for an event for at most timeout milliseconds and process it;
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// return the number of events processed (possibly 0 if timeout expired) or
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// -1 if an error occurred
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virtual int Dispatch(int timeout = TIMEOUT_INFINITE) = 0;
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virtual ~wxFDIODispatcher() { }
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};
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//entry for wxFDIOHandlerMap
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struct wxFDIOHandlerEntry
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{
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wxFDIOHandlerEntry()
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{
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}
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wxFDIOHandlerEntry(wxFDIOHandler *handler_, int flags_)
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: handler(handler_),
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flags(flags_)
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{
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}
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wxFDIOHandler *handler;
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int flags;
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};
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// this hash is used to map file descriptors to their handlers
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WX_DECLARE_HASH_MAP(
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int,
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wxFDIOHandlerEntry,
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wxIntegerHash,
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wxIntegerEqual,
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wxFDIOHandlerMap
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);
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// FDIODispatcher that holds map fd <-> FDIOHandler, this should be used if
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// this map isn't maintained elsewhere already as it is usually needed anyhow
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//
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// notice that all functions for FD management have implementation
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// in the base class and should be called from the derived classes
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class WXDLLIMPEXP_BASE wxMappedFDIODispatcher : public wxFDIODispatcher
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{
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public:
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// find the handler for the given fd, return NULL if none
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wxFDIOHandler *FindHandler(int fd) const;
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// register handler for the given descriptor with the dispatcher, return
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// true on success or false on error
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virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags) wxOVERRIDE;
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// modify descriptor flags or handler, return true on success
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virtual bool ModifyFD(int fd, wxFDIOHandler *handler, int flags) wxOVERRIDE;
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// unregister descriptor previously registered with RegisterFD()
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virtual bool UnregisterFD(int fd) wxOVERRIDE;
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virtual ~wxMappedFDIODispatcher() { }
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protected:
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// the fd -> handler map containing all the registered handlers
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wxFDIOHandlerMap m_handlers;
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};
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#endif // _WX_PRIVATE_FDIODISPATCHER_H_
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