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In general, events are code handling some some condition, which is scheduled when such condition happened and executed independently from I/O loop. Work-events are a subgroup of events that are scheduled repeatedly until some (often significant) work is done (e.g. feeding routes to protocol). All scheduled events are executed during each I/O loop iteration. Separate work-events from regular events to a separate queue and rate limit their execution to a fixed number per I/O loop iteration. That should prevent excess latency when many work-events are scheduled at one time (e.g. simultaneous reload of many BGP sessions).
53 lines
968 B
C
53 lines
968 B
C
/*
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* BIRD Library -- Event Processing
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*
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* (c) 1999 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_EVENT_H_
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#define _BIRD_EVENT_H_
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#include "lib/resource.h"
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typedef struct event {
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resource r;
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void (*hook)(void *);
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void *data;
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node n; /* Internal link */
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} event;
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typedef list event_list;
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extern event_list global_event_list;
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extern event_list global_work_list;
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event *ev_new(pool *);
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void ev_run(event *);
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#define ev_init_list(el) init_list(el)
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void ev_enqueue(event_list *, event *);
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void ev_schedule(event *);
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void ev_schedule_work(event *);
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void ev_postpone(event *);
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int ev_run_list(event_list *);
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int ev_run_list_limited(event_list *, uint);
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static inline int
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ev_active(event *e)
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{
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return e->n.next != NULL;
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}
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static inline event*
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ev_new_init(pool *p, void (*hook)(void *), void *data)
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{
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event *e = ev_new(p);
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e->hook = hook;
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e->data = data;
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return e;
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}
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#endif
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