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IOSelector.h

Go to the documentation of this file.

#ifndef CLASSLIB_IO_SELECTOR_H
# define CLASSLIB_IO_SELECTOR_H

//<<<<<< INCLUDES                                                       >>>>>>

# include "classlib/sysapi/IOTypes.h"
# include "classlib/iobase/IOSelectCB.h"
# include <vector>

namespace lat {
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>

class IOChannel;
class IOSelectMethod;

//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class IOSelector
{
public:
    enum Strategy {
        S_DEFAULT,

        S_SELECT,

        S_RTSIGIO,

        S_RTSIGONE,

        S_DEVPOLL,

        S_POLL,

        S_KQUEUE
    };

    CLASSLIB_API static const Strategy SV_DEFAULT [];

    CLASSLIB_API static const Strategy SV_HIGHPERF [];

    IOSelector (const Strategy *strategy = SV_DEFAULT);
    virtual ~IOSelector (void);

    // virtual void     init (void);
    // virtual void     setOption (int option, int value);
    // virtual void     shutdown (void);

    // Attaching and detaching channels
    virtual void        attach (IOChannel *channel, unsigned mask,
                                IOSelectCB c = IOSelectCB());
    virtual void        detach (IOChannel *channel);
    // virtual void     detach (unsigned index);
    virtual void        clear (void);

    // Channel status access
    // virtual unsigned channels    (void) const;

    // virtual IOChannel *      channel     (unsigned index) const;
    // virtual unsigned mask        (unsigned index) const;
    virtual void        setMask     (IOChannel *channel, unsigned value);
    virtual void        andMask     (IOChannel *channel, unsigned value);
    virtual void        orMask      (IOChannel *channel, unsigned value);

    // virtual unsigned status      (unsigned index) const;
    // virtual void     clearStatus (unsigned index, unsigned valueMask);
    // virtual bool     canAccept   (unsigned index) const;
    // virtual bool     canConnect  (unsigned index) const;
    // virtual bool     canRead     (unsigned index) const;
    // virtual bool     canWrite    (unsigned index) const;
    // virtual bool     canUrgent   (unsigned index) const;

    // Selection
    virtual unsigned    dispatch    (long msecs = -1);
    virtual unsigned    pump        (long msecs = -1);
    virtual bool        wait        (long msecs = -1);
    virtual bool        nextReady   (IOSelectEvent &event, IOSelectCB &c);
    //< NB: No guarantees as to the order in which clients are processed!

    // virtual void     initWakeUpPipe (void);
    // virtual int      wakeUp (void);

private:
#if 0
    virtual unsigned    clients   (void) const = 0;
    virtual IOFD        fd        (unsigned index) const = 0;
    virtual unsigned    mask      (unsigned index) const = 0;
    virtual void        setMask   (unsigned index, unsigned value) = 0;
    virtual void        andMask   (unsigned index, unsigned value);
    virtual void        orMask    (unsigned index, unsigned value);
    virtual unsigned    status    (unsigned index) const = 0;
    virtual void        setStatus (unsigned index, unsigned value) = 0;
#endif

    IOSelectMethod      *m_strategy;
    // Pipe             *m_wakeUpPipe;
};

//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>

} // namespace lat
#endif // CLASSLIB_IO_SELECTOR_H

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