# The Timer Class

    /*
    **	(c) COPYRIGHT MIT 1995.
    **	Please first read the full copyright statement in the file COPYRIGH.
    */

The Timer class handles timer for libwww and the application. This works exactly as in X where you create a timer object with a callback function and a timeout. The callback will be called every time the timer expires.

    #ifndef HTTIMER_H
    #define HTTIMER_H

    #include "sysdep.h"
    #include "HTReq.h"

    #ifndef IN_EVENT
    typedef struct _HTTimer HTTimer;
    #endif

    typedef int HTTimerCallback (HTTimer *, void *, HTEventType type);

### Create and Delete Timers

    extern HTTimer * HTTimer_new (HTTimer *, HTTimerCallback *,
    			      void *, ms_t millis, BOOL relative);
    extern BOOL HTTimer_refresh(HTTimer * timer, ms_t now);
    extern BOOL HTTimer_delete (HTTimer * timer);
    extern BOOL HTTimer_deleteAll (void);
    extern int HTTimer_dispatch (HTTimer * timer);
    extern ms_t HTTimer_getTime(HTTimer * timer);

### Platform Specific Timers

On some platform, timers are supported via events or other OS specific mechanisms. You can make libwww can support these by registering a platform specific timer add and timer delete method.

    typedef BOOL HTTimerSetCallback (HTTimer * timer);

    extern BOOL HTTimer_registerSetTimerCallback (HTTimerSetCallback * cbf);
    extern BOOL HTTimer_registerDeleteTimerCallback (HTTimerSetCallback * cbf);

### Get the next timer in line

Dispatches all expired timers and optionally returns the time till the next one.

    extern int HTTimer_next (ms_t * pSoonest);

    #endif /* HTTIMER_H */