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IOSelectSig.h

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#ifndef CLASSLIB_IOSELECT_SIG_H
# define CLASSLIB_IOSELECT_SIG_H

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

# include "IOSelectPoll.h"
# if HAVE_POSIX_RT_SIGNALS && HAVE_F_SETSIG
#  include <sys/time.h>
#  include <sys/types.h>
#  include <unistd.h>
#  include <signal.h>
#  include <errno.h>
#  include <fcntl.h>

namespace lat {
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>
//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class IOSelectSig : public IOSelectMethod
{
public:
    IOSelectSig (void);
    ~IOSelectSig (void);

    virtual void        setSignal (int sig);

    // Attaching and detaching descriptors
    virtual void        attach    (const IOSelectRequest &req);
    virtual void        detach    (const IOSelectRequest &req);
    virtual void        clear     (void);

    // Descriptor listening states
    virtual void        setMask   (IOFD fd, unsigned value);
    virtual void        andMask   (IOFD fd, unsigned value);
    virtual void        orMask    (IOFD fd, unsigned value);

    // Selection
    virtual bool        wait      (long msecs);
    virtual IOFD        next      (IOSelectEvent &event, IOSelectCB &cb);

private:
    static const int UNUSED   = -2;
    static const int UNLINKED = -1;

    void                addReady    (IOFD fd);
    void                delReady    (IOFD fd);
    void                updateReady (IOFD fd);

    struct item {
        IOFD            m_next;

        IOFD            m_prev;

        unsigned        m_mask;

        unsigned        m_ready;

        size_t          m_index;
    };

    IOSelectPoll        *m_fallback;            //< Fallback poller.
    int                 m_signal;               //< Signal number.
    sigset_t            m_sigset;               //< Signal set.
    IOFD                m_readylist;            //< Index of first fd ready.
    size_t              m_nready;               //< Number of ready fds.
    size_t              m_nfds;                 //< Nr of fds in use in m_fds.
    std::vector<item>   m_fds;                  //< Per file descriptor data.
};

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

} // namespace lat
# endif // HAVE_POSIX_RT_SIGNALS && HAVE_F_SETSIG
#endif // CLASSLIB_IOSELECT_SIG_H

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