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/*
* The Unix Channel
*
* by Michel Beaudouin-Lafon
*
* Copyright 1990-1993
* Laboratoire de Recherche en Informatique (LRI)
*
* Channel sets, or multiplexers
*
* $Id$
* $CurLog$
*/
#ifndef Multiplexer_H_
#define Multiplexer_H_
#include "Channel.h"
#include <sys/types.h>
#include "ccu/Timer.h"
extern char* StrReprBuf;
// This class defines channel sets for multiplexing i/o
// Because of the coercion defined for FILDES -> int,
// most arguments of type ints can be FILDES, UchChannel, ...
// An array of pointers to channels is kept in the object;
// we use smart pointers to handle deletion cleanly.
// The masks for reading/writing are kept consistent with the IOMode of
// the channels, as long as it is not changed by a direct access to the channel
// operator[] returns a pointer and cannot be used as an lhs of an assignment.
//
enum MPX_RES { isMpxEmpty, isMpxTerminated, isMpxError, isMpxAborted };
class UchBaseMultiplexer : public CcuSmartData {
friend class UchBaseTimeOut;
friend class UchBaseSignalHandler;
protected:
pUchChannel* Channels;
CcuTimerSet Timers;
short ReadCount;
short WriteCount;
short SelectCount;
bool Looping;
bool SigFired;
UchBaseSignalHandler** Handlers;
int* NbSignals;
void HandleSignal (UchBaseSignalHandler&);
void HandleDeferredSignals ();
inline CcuTimerSet* GetTimerSet () { return &Timers; }
virtual void SetMasks (int, IOMODE) = 0;
virtual void SetTimeOut (Millisecond) = 0;
virtual void SuppressTimeOut () = 0;
virtual void AddSignalHook ();
virtual MPX_RES Loop () = 0;
public:
UchBaseMultiplexer ();
~UchBaseMultiplexer ();
inline pUchChannel operator [] (int fd) { if (fd < 0) return pUchChannel (0); else return Channels [fd]; }
void Add (UchChannel*);
inline void Add (const UchChannel& ch) { Add (ch.Copy ()); }
void Remove (int);
void RemoveAll ();
void SetMode (int, IOMODE);
MPX_RES Run ();
void Abort ();
void Close ();
};
PointerClass (pUchBaseMultiplexer, UchBaseMultiplexer);
class UchMultiplexer : public UchBaseMultiplexer {
protected:
fd_set ReadMask;
fd_set WriteMask;
fd_set SelectMask;
Millisecond TimeOut;
int fd0; // used by HandleSelect and LoopScan
void SetMasks (int, IOMODE);
void SetTimeOut (Millisecond);
void SuppressTimeOut ();
MPX_RES Loop ();
public:
UchMultiplexer ();
~UchMultiplexer ();
bool HandleSelect ();
int Scan (bool nointr = TRUE, bool poll = FALSE);
MPX_RES LoopScan (bool nointr = TRUE);
inline void LoopEnd () { Looping = FALSE; }
char* StrRepr (char* = StrReprBuf);
};
#endif /* Multiplexer_H_ */
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