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/*
* Ivy League
*
* Channel sets, or multiplexers, or schedulers
*
* Copyright 1990-2000
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* original code by Michel Beaudouin-Lafon,
* heavily modified by Stephane Chatty and Stephane Sire
*
* $Id$
*
*/
#ifndef IvlScheduler_H_
#define IvlScheduler_H_
#include "ivl/Loop.h"
#include "Channel.h"
#include <sys/types.h>
#include "ivl/Timer.h"
extern char* StrReprBuf;
// This class defines channel sets for multiplexing i/o
// Because of the coercion defined for IvlFd -> int,
// most arguments of type ints can be IvlFd, IvlChannel, ...
// An array of pointers to channels is kept in the object;
// 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.
//
// WARNING: when the Scheduler is deleted, the Channels it still
// have in its channel set are not Removed; instead IvlChannel::Removed
// is called
class IvlBaseScheduler : public IvlBaseMultiplexer {
friend class IvlBaseTimeOut;
friend class IvlBaseScheduledHandler;
friend class IvlChannel;
friend MPX_RES IvlLoop ();
protected:
IvlChannel** Channels;
IvlTimerSet Timers;
short ReadCount;
short WriteCount;
short SelectCount;
bool Looping;
bool SigFired;
IvlBaseScheduledHandler** Handlers;
int* NbSignals;
bool Add (IvlChannel*);
bool Remove (int);
void HandleSignal (IvlBaseScheduledHandler&);
void HandleDeferredSignals ();
inline IvlTimerSet* GetTimerSet () { return &Timers; }
virtual void SetMasks (int, IOMODE);
virtual void SetTimeOut (Millisecond) = 0;
virtual void SuppressTimeOut () = 0;
virtual void AddSignalHook ();
public:
IvlBaseScheduler ();
~IvlBaseScheduler ();
IvlChannel* operator [] (int);
void RemoveAll ();
void SetMode (int, IOMODE);
MPX_RES Run ();
void Abort ();
void Close ();
};
class IvlScheduler : public IvlBaseScheduler {
protected:
fd_set ReadMask;
fd_set WriteMask;
fd_set SelectMask;
IvlList Hooks;
IvlList FinalHooks;
bool Looping;
Millisecond TimeOut;
void SetMasks (int, IOMODE);
void SetTimeOut (Millisecond);
void SuppressTimeOut ();
MPX_RES Loop ();
void ExecHooks (bool = false);
public:
IvlScheduler ();
~IvlScheduler ();
MPX_RES LoopScan (bool nointr = true);
int Scan (bool nointr = true, bool poll = false);
void Stop ();
char* StrRepr (char* = StrReprBuf);
void AddHook (IvlMpxHook*, bool = false);
void RemoveHook (IvlMpxHook*, bool = false);
void AddFinalHook (IvlMpxHook*);
void RemoveFinalHook (IvlMpxHook*);
};
extern IvlBaseScheduler* IvlScd;
extern void IvlOpen (IvlBaseScheduler* = 0);
#if 0 /* rendu inutile par la fusion avec DNN ? */
extern MPX_RES IvlLoop ();
extern void IvlStop ();
#endif
#endif /* IvlScheduler_H_ */
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