timers.h

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/* timers.h - header file for timers package
**
** Copyright (C)1995,1998 by Jef Poskanzer <[e-mail]>. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
*/

#ifndef _LIBTMR_H_
#define _LIBTMR_H_

#include <sys/time.h>

/* ClientData is a random value that tags along with a timer.  The client
** can use it for whatever, and it gets passed to the callback when the
** timer triggers.
*/
typedef union {
    void* p;
    int i;
    long l;
    } ClientData;

/* The TimerProc gets called when the timer expires.  It gets passed
** the ClientData associated with the timer, and a timeval in case
** it wants to schedule another timer.
*/
typedef void TimerProc( ClientData client_data, struct timeval* nowP );

/* The Timer struct. */
typedef struct TimerStruct {
    TimerProc* timer_proc;
    ClientData client_data;
    long msecs;
    int periodic;
    struct timeval time;
    struct TimerStruct* next;
    } Timer;

/* Set up a timer, either periodic or one-shot. Returns (Timer*) 0 on errors. */
extern Timer* tmr_create(
    struct timeval* nowP, TimerProc* timer_proc, ClientData client_data,
    long msecs, int periodic );

/* Returns a timeout indicating how long until the next timer triggers.  You
** can just put the call to this routine right in your select().  Returns
** (struct timeval*) 0 if no timers are pending.
*/
extern struct timeval* tmr_timeout( struct timeval* nowP );

/* Run the list of timers. Your main program needs to call this every so often,
** or as indicated by tmr_timeout().
*/
extern void tmr_run( struct timeval* nowP );

/* Reset the clock on a timer, to current time plus the original timeout. */
extern void tmr_reset( struct timeval* nowP, Timer* timer );

/* Deschedule a timer.  Note that non-periodic timers are automatically
** descheduled when they run, so you don't have to call this on them.
*/
extern void tmr_cancel( Timer* timer );

/* Clean up the timers package, freeing any unused storage. */
extern void tmr_cleanup( void );

/* Cancel all timers and free storage, usually in preparation for exitting. */
extern void tmr_destroy( void );

/* Return usage stats on the timer package. */
extern void tmr_stats( int* activeP, int* freeP );

#endif /* _LIBTMR_H_ */