515 lines
10 KiB
C
515 lines
10 KiB
C
/* $NetBSD: ev_timers.c,v 1.4 2007/01/28 01:43:52 christos Exp $ */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1995-1999 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* ev_timers.c - implement timers for the eventlib
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* vix 09sep95 [initial]
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*/
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#include <sys/cdefs.h>
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#if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
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#ifdef notdef
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static const char rcsid[] = "Id: ev_timers.c,v 1.5.18.1 2005/04/27 05:01:06 sra Exp";
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#else
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__RCSID("$NetBSD: ev_timers.c,v 1.4 2007/01/28 01:43:52 christos Exp $");
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#endif
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#endif
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/* Import. */
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#include "port_before.h"
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#include "fd_setsize.h"
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#include <errno.h>
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#include <isc/assertions.h>
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#include <isc/eventlib.h>
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#include "eventlib_p.h"
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#include "port_after.h"
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/* Constants. */
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#define MILLION 1000000
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#define BILLION 1000000000
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/* Forward. */
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#ifndef _LIBC
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static int due_sooner(void *, void *);
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static void set_index(void *, int);
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static void free_timer(void *, void *);
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static void print_timer(void *, void *);
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static void idle_timeout(evContext, void *, struct timespec, struct timespec);
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/* Private type. */
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typedef struct {
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evTimerFunc func;
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void * uap;
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struct timespec lastTouched;
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struct timespec max_idle;
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evTimer * timer;
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} idle_timer;
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#endif
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/* Public. */
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struct timespec
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evConsTime(time_t sec, long nsec) {
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struct timespec x;
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x.tv_sec = sec;
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x.tv_nsec = nsec;
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return (x);
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}
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struct timespec
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evAddTime(struct timespec addend1, struct timespec addend2) {
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struct timespec x;
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x.tv_sec = addend1.tv_sec + addend2.tv_sec;
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x.tv_nsec = addend1.tv_nsec + addend2.tv_nsec;
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if (x.tv_nsec >= BILLION) {
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x.tv_sec++;
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x.tv_nsec -= BILLION;
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}
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return (x);
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}
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struct timespec
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evSubTime(struct timespec minuend, struct timespec subtrahend) {
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struct timespec x;
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x.tv_sec = minuend.tv_sec - subtrahend.tv_sec;
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if (minuend.tv_nsec >= subtrahend.tv_nsec)
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x.tv_nsec = minuend.tv_nsec - subtrahend.tv_nsec;
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else {
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x.tv_nsec = BILLION - subtrahend.tv_nsec + minuend.tv_nsec;
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x.tv_sec--;
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}
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return (x);
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}
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int
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evCmpTime(struct timespec a, struct timespec b) {
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long x = a.tv_sec - b.tv_sec;
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if (x == 0L)
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x = a.tv_nsec - b.tv_nsec;
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return (x < 0L ? (-1) : x > 0L ? (1) : (0));
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}
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struct timespec
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evNowTime() {
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struct timeval now;
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#ifdef CLOCK_REALTIME
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struct timespec tsnow;
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int m = CLOCK_REALTIME;
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#ifdef CLOCK_MONOTONIC
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#ifndef _LIBC
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if (__evOptMonoTime)
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m = CLOCK_MONOTONIC;
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#endif
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#endif
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if (clock_gettime(m, &tsnow) == 0)
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return (tsnow);
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#endif
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if (gettimeofday(&now, NULL) < 0)
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return (evConsTime(0L, 0L));
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return (evTimeSpec(now));
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}
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struct timespec
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evUTCTime(void) {
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struct timeval now;
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#ifdef CLOCK_REALTIME
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struct timespec tsnow;
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if (clock_gettime(CLOCK_REALTIME, &tsnow) == 0)
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return (tsnow);
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#endif
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if (gettimeofday(&now, NULL) < 0)
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return (evConsTime(0L, 0L));
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return (evTimeSpec(now));
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}
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#ifndef _LIBC
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struct timespec
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evLastEventTime(evContext opaqueCtx) {
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evContext_p *ctx = opaqueCtx.opaque;
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return (ctx->lastEventTime);
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}
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#endif
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struct timespec
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evTimeSpec(struct timeval tv) {
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struct timespec ts;
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ts.tv_sec = tv.tv_sec;
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ts.tv_nsec = tv.tv_usec * 1000;
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return (ts);
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}
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struct timeval
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evTimeVal(struct timespec ts) {
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struct timeval tv;
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tv.tv_sec = ts.tv_sec;
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tv.tv_usec = ts.tv_nsec / 1000;
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return (tv);
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}
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#ifndef _LIBC
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int
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evSetTimer(evContext opaqueCtx,
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evTimerFunc func,
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void *uap,
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struct timespec due,
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struct timespec inter,
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evTimerID *opaqueID
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *id;
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evPrintf(ctx, 1,
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"evSetTimer(ctx %p, func %p, uap %p, due %ld.%09ld, inter %ld.%09ld)\n",
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ctx, func, uap,
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(long)due.tv_sec, due.tv_nsec,
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(long)inter.tv_sec, inter.tv_nsec);
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#ifdef __hpux
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/*
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* tv_sec and tv_nsec are unsigned.
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*/
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if (due.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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if (inter.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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#else
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if (due.tv_sec < 0 || due.tv_nsec < 0 || due.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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if (inter.tv_sec < 0 || inter.tv_nsec < 0 || inter.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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#endif
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/* due={0,0} is a magic cookie meaning "now." */
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if (due.tv_sec == (time_t)0 && due.tv_nsec == 0L)
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due = evNowTime();
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/* Allocate and fill. */
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OKNEW(id);
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id->func = func;
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id->uap = uap;
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id->due = due;
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id->inter = inter;
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if (heap_insert(ctx->timers, id) < 0)
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return (-1);
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/* Remember the ID if the caller provided us a place for it. */
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if (opaqueID)
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opaqueID->opaque = id;
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if (ctx->debug > 7) {
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evPrintf(ctx, 7, "timers after evSetTimer:\n");
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(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
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}
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return (0);
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}
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int
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evClearTimer(evContext opaqueCtx, evTimerID id) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *del = id.opaque;
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if (ctx->cur != NULL &&
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ctx->cur->type == Timer &&
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ctx->cur->u.timer.this == del) {
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evPrintf(ctx, 8, "deferring delete of timer (executing)\n");
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/*
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* Setting the interval to zero ensures that evDrop() will
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* clean up the timer.
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*/
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del->inter = evConsTime(0, 0);
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return (0);
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}
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if (heap_element(ctx->timers, del->index) != del)
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EV_ERR(ENOENT);
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if (heap_delete(ctx->timers, del->index) < 0)
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return (-1);
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FREE(del);
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if (ctx->debug > 7) {
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evPrintf(ctx, 7, "timers after evClearTimer:\n");
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(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
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}
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return (0);
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}
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int
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evConfigTimer(evContext opaqueCtx,
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evTimerID id,
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const char *param,
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int value
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *timer = id.opaque;
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int result=0;
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UNUSED(value);
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if (heap_element(ctx->timers, timer->index) != timer)
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EV_ERR(ENOENT);
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if (strcmp(param, "rate") == 0)
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timer->mode |= EV_TMR_RATE;
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else if (strcmp(param, "interval") == 0)
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timer->mode &= ~EV_TMR_RATE;
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else
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EV_ERR(EINVAL);
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return (result);
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}
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int
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evResetTimer(evContext opaqueCtx,
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evTimerID id,
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evTimerFunc func,
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void *uap,
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struct timespec due,
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struct timespec inter
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *timer = id.opaque;
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struct timespec old_due;
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int result=0;
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if (heap_element(ctx->timers, timer->index) != timer)
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EV_ERR(ENOENT);
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#ifdef __hpux
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/*
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* tv_sec and tv_nsec are unsigned.
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*/
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if (due.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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if (inter.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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#else
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if (due.tv_sec < 0 || due.tv_nsec < 0 || due.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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if (inter.tv_sec < 0 || inter.tv_nsec < 0 || inter.tv_nsec >= BILLION)
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EV_ERR(EINVAL);
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#endif
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old_due = timer->due;
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timer->func = func;
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timer->uap = uap;
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timer->due = due;
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timer->inter = inter;
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switch (evCmpTime(due, old_due)) {
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case -1:
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result = heap_increased(ctx->timers, timer->index);
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break;
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case 0:
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result = 0;
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break;
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case 1:
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result = heap_decreased(ctx->timers, timer->index);
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break;
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}
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if (ctx->debug > 7) {
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evPrintf(ctx, 7, "timers after evResetTimer:\n");
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(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
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}
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return (result);
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}
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int
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evSetIdleTimer(evContext opaqueCtx,
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evTimerFunc func,
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void *uap,
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struct timespec max_idle,
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evTimerID *opaqueID
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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idle_timer *tt;
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/* Allocate and fill. */
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OKNEW(tt);
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tt->func = func;
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tt->uap = uap;
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tt->lastTouched = ctx->lastEventTime;
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tt->max_idle = max_idle;
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if (evSetTimer(opaqueCtx, idle_timeout, tt,
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evAddTime(ctx->lastEventTime, max_idle),
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max_idle, opaqueID) < 0) {
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FREE(tt);
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return (-1);
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}
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tt->timer = opaqueID->opaque;
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return (0);
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}
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int
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evClearIdleTimer(evContext opaqueCtx, evTimerID id) {
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evTimer *del = id.opaque;
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idle_timer *tt = del->uap;
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FREE(tt);
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return (evClearTimer(opaqueCtx, id));
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}
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int
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evResetIdleTimer(evContext opaqueCtx,
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evTimerID opaqueID,
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evTimerFunc func,
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void *uap,
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struct timespec max_idle
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *timer = opaqueID.opaque;
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idle_timer *tt = timer->uap;
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tt->func = func;
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tt->uap = uap;
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tt->lastTouched = ctx->lastEventTime;
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tt->max_idle = max_idle;
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return (evResetTimer(opaqueCtx, opaqueID, idle_timeout, tt,
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evAddTime(ctx->lastEventTime, max_idle),
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max_idle));
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}
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int
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evTouchIdleTimer(evContext opaqueCtx, evTimerID id) {
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evContext_p *ctx = opaqueCtx.opaque;
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evTimer *t = id.opaque;
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idle_timer *tt = t->uap;
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tt->lastTouched = ctx->lastEventTime;
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return (0);
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}
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/* Public to the rest of eventlib. */
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heap_context
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evCreateTimers(const evContext_p *ctx) {
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UNUSED(ctx);
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return (heap_new(due_sooner, set_index, 2048));
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}
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void
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evDestroyTimers(const evContext_p *ctx) {
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(void) heap_for_each(ctx->timers, free_timer, NULL);
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(void) heap_free(ctx->timers);
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}
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/* Private. */
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static int
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due_sooner(void *a, void *b) {
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evTimer *a_timer, *b_timer;
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a_timer = a;
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b_timer = b;
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return (evCmpTime(a_timer->due, b_timer->due) < 0);
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}
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static void
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set_index(void *what, int idx) {
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evTimer *timer;
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timer = what;
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timer->index = idx;
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}
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static void
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free_timer(void *what, void *uap) {
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evTimer *t = what;
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UNUSED(uap);
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FREE(t);
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}
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static void
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print_timer(void *what, void *uap) {
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evTimer *cur = what;
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evContext_p *ctx = uap;
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cur = what;
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evPrintf(ctx, 7,
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" func %p, uap %p, due %ld.%09ld, inter %ld.%09ld\n",
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cur->func, cur->uap,
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(long)cur->due.tv_sec, cur->due.tv_nsec,
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(long)cur->inter.tv_sec, cur->inter.tv_nsec);
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}
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static void
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idle_timeout(evContext opaqueCtx,
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void *uap,
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struct timespec due,
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struct timespec inter
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) {
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evContext_p *ctx = opaqueCtx.opaque;
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idle_timer *this = uap;
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struct timespec idle;
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UNUSED(due);
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UNUSED(inter);
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idle = evSubTime(ctx->lastEventTime, this->lastTouched);
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if (evCmpTime(idle, this->max_idle) >= 0) {
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(this->func)(opaqueCtx, this->uap, this->timer->due,
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this->max_idle);
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/*
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* Setting the interval to zero will cause the timer to
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* be cleaned up in evDrop().
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*/
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this->timer->inter = evConsTime(0L, 0L);
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FREE(this);
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} else {
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/* evDrop() will reschedule the timer. */
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this->timer->inter = evSubTime(this->max_idle, idle);
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}
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}
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#endif
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/*! \file */
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