#ifndef IO_MUX_IMPL_H_
#define IO_MUX_IMPL_H_

#include "ucore/iomux.h"
#include "ucore/timers.h"
/** struct for IOMux implementations */
struct IOMuxOps {
    /** Run one iteration of the mux.
     * The mux implementation must honor the timeout, if given.
     * The mux implementation must call iomux_timers_run after the
     * polling has occured (or if it's polling times out)
     * 
     * @param mux The IOMux instance
     * @param timeout absolute time of a timeout - after which timers should run.
     * If timeout is NULL, no timeout should be set on the poll.
     */
    int (*run_impl)(struct IOMux *mux, struct timeval *timeout);

    /* Deallocate the instance specific part of the IOMux */
    void (*delete_impl)(struct IOMux *mux);

    /** Register an IOMuxFD for events*/
    int (*register_fd_impl)(struct IOMux *mux, struct IOMuxFD *fd);
    /** Unregister an IOMuxFD */
    int (*unregister_fd_impl)(struct IOMux *mux, struct IOMuxFD *fd);
    /** Update an IOMuxFD (due to its events ('what') has changed*/
    int (*update_events_impl)(struct IOMux *mux, struct IOMuxFD *fd);

};

struct IOMux {
    /* TImer instance - must be the 1. member*/
    struct UCTimers timers;

    /**
     * Clock used for driving timers, and
     * providing timeouts for the mux
     */
    struct UCoreClock *uclock;

    struct IOMuxOps ops;

    /* Used by mux implementations to hold their own data/instance */
    void *instance;
};
//TODO - have iomux_xx_init embed struct IOMux and get rid of IOMux.instance
//for better cache friendiness

int iomux_select_init(struct IOMux *mux);
int iomux_epoll_init(struct IOMux *mux);
int iomux_timers_run(struct IOMux *mux);

#endif