/////////////////////////////////////////////////////////////////////////////
// Name: wx/private/selectdispatcher.h
// Purpose: wxSelectDispatcher class
-// Authors: Lukasz Michalski
-// Modified by:
+// Authors: Lukasz Michalski and Vadim Zeitlin
// Created: December 2006
// Copyright: (c) Lukasz Michalski
// RCS-ID: $Id$
#include "wx/defs.h"
-#include "wx/hashmap.h"
+#if wxUSE_SELECT_DISPATCHER
-static const int wxSELECT_TIMEOUT_INFINITE = -1;
+#include <sys/types.h>
-// handler used to process events on descriptors
-class wxFDIOHandler
+#include "wx/private/fdiodispatcher.h"
+
+// helper class storing all the select() fd sets
+class WXDLLIMPEXP_BASE wxSelectSets
{
public:
- // called when descriptor is available for non-blocking read
- virtual void OnReadWaiting(int fd) = 0;
-
- // called when descriptor is available for non-blocking write
- virtual void OnWriteWaiting(int fd) = 0;
+ // ctor zeroes out all fd_sets
+ wxSelectSets();
- // called when there is exception on descriptor
- virtual void OnExceptionWaiting(int fd) = 0;
+ // default copy ctor, assignment operator and dtor are ok
- // virtual dtor for the base class
- virtual ~wxFDIOHandler() { }
-};
-
-// those flags describes sets where descriptor should be added
-enum wxSelectDispatcherEntryFlags
-{
- wxSelectInput = 1,
- wxSelectOutput = 2,
- wxSelectException = 4,
- wxSelectAll = wxSelectInput | wxSelectOutput | wxSelectException
-};
-WX_DECLARE_HASH_MAP(
- int,
- wxFDIOHandler*,
- wxIntegerHash,
- wxIntegerEqual,
- wxFDIOHandlerMap
-);
+ // return true if fd appears in any of the sets
+ bool HasFD(int fd) const;
-class WXDLLIMPEXP_CORE wxSelectDispatcher
-{
-public:
- // returns instance of the table
- static wxSelectDispatcher& Get();
+ // add or remove FD to our sets depending on whether flags contains
+ // wxFDIO_INPUT/OUTPUT/EXCEPTION bits
+ bool SetFD(int fd, int flags);
- virtual ~wxSelectDispatcher()
+ // same as SetFD() except it unsets the bits set in the flags for the given
+ // fd
+ bool ClearFD(int fd)
{
+ return SetFD(fd, 0);
}
- // register descriptor in sets.
- void RegisterFD(int fd, wxFDIOHandler* handler, int flags = wxSelectAll);
- // unregister descriptor from sets and return handler for cleanup
- wxFDIOHandler* UnregisterFD(int fd, int flags = wxSelectAll);
+ // call select() with our sets: the other parameters are the same as for
+ // select() itself
+ int Select(int nfds, struct timeval *tv);
- // return handler for descriptor or null if fd is not registered
- wxFDIOHandler* FindHandler(int fd);
+ // call the handler methods corresponding to the sets having this fd
+ void Handle(int fd, wxFDIOHandler& handler) const;
- // calls select on registered descriptors and
- void RunLoop(int timeout = wxSELECT_TIMEOUT_INFINITE);
+private:
+ typedef void (wxFDIOHandler::*Callback)();
+
+ // the FD sets indices
+ enum
+ {
+ Read,
+ Write,
+ Except,
+ Max
+ };
+
+ // the sets used with select()
+ fd_set m_fds[Max];
+
+ // the wxFDIO_XXX flags, functions and names (used for debug messages only)
+ // corresponding to the FD sets above
+ static int ms_flags[Max];
+ static const char *ms_names[Max];
+ static Callback ms_handlers[Max];
+};
+
+class WXDLLIMPEXP_BASE wxSelectDispatcher : public wxMappedFDIODispatcher
+{
+public:
+ // creates an instance of this class, the caller takes ownership of it
+ static wxSelectDispatcher *Create();
+
+ // implement pure virtual methods of the base class
+ virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags = wxFDIO_ALL);
+ virtual bool ModifyFD(int fd, wxFDIOHandler *handler, int flags = wxFDIO_ALL);
+ virtual bool UnregisterFD(int fd);
+ virtual void Dispatch(int timeout = TIMEOUT_INFINITE);
protected:
- wxSelectDispatcher() { m_maxFD = -1; }
+ // ctor is not public, use Create()
+ wxSelectDispatcher();
private:
- void ProcessSets(fd_set* readset, fd_set* writeset, fd_set* exeptset, int max_fd);
+ // common part of RegisterFD() and ModifyFD()
+ bool DoUpdateFDAndHandler(int fd, wxFDIOHandler *handler, int flags);
- fd_set m_readset;
- fd_set m_writeset;
- fd_set m_exeptset;
+ // call the handlers for the fds present in the given sets
+ void ProcessSets(const wxSelectSets& sets);
- int m_maxFD;
- wxFDIOHandlerMap m_handlers;
+ // helper of ProcessSets(): call the handler if its fd is in the set
+ void DoProcessFD(int fd, const fd_set& fds, wxFDIOHandler *handler,
+ const char *name);
- static wxSelectDispatcher *ms_instance;
- friend class wxSelectDispatcherModule;
+ // the select sets containing all the registered fds
+ wxSelectSets m_sets;
+
+ // the highest registered fd value or -1 if none
+ int m_maxFD;
};
+#endif // wxUSE_SELECT_DISPATCHER
#endif // _WX_PRIVATE_SOCKETEVTDISPATCH_H_
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