68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
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/*
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* Layer Two Tunnelling Protocol Daemon
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* Copyright (C) 1998 Adtran, Inc.
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* Copyright (C) 2002 Jeff McAdams
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*
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* Mark Spencer
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*
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* This software is distributed under the terms
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* of the GPL, which you should have received
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* along with this source.
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*
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* Scheduler structures and functions
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*
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*/
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#ifndef _SCHEDULER_H
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#define _SCHEDULER_H
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#include <sys/time.h>
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/*
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* The idea is to provide a general scheduler which can schedule
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* events to be run periodically
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*/
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struct schedule_entry
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{
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struct timeval tv; /* Scheduled time to execute */
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void (*func) (void *); /* Function to execute */
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void *data; /* Data to be passed to func */
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struct schedule_entry *next; /* Next entry in queue */
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};
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extern struct schedule_entry *events;
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/* Schedule func to be executed with argument data sometime
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tv in the future. */
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struct schedule_entry *schedule (struct timeval tv, void (*func) (void *),
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void *data);
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/* Like schedule() but tv represents an absolute time in the future */
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struct schedule_entry *aschedule (struct timeval tv, void (*func) (void *),
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void *data);
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/* Remove a scheduled event from the queue */
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void deschedule (struct schedule_entry *);
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/* Initialization function */
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void init_scheduler (void);
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/* Scheduled event processor */
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struct timeval *process_schedule(struct timeval *);
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/* Compare two timeval functions and see if a <= b */
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#define TVLESS(a,b) ((a).tv_sec == (b).tv_sec ? \
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((a).tv_usec < (b).tv_usec) : \
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((a).tv_sec < (b).tv_sec))
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#define TVLESSEQ(a,b) ((a).tv_sec == (b).tv_sec ? \
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((a).tv_usec <= (b).tv_usec) : \
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((a).tv_sec <= (b).tv_sec))
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#define TVGT(a,b) ((a).tv_sec == (b).tv_sec ? \
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((a).tv_usec > (b).tv_usec) : \
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((a).tv_sec > (b).tv_sec))
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#endif
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