libc/upstream-netbsd/lib/libc/isc/ev_timers.c - nest-cam/4320010/libc - Git at Google

 /*	$NetBSD: ev_timers.c,v 1.11 2012/03/21 00:34:54 christos Exp $	*/

 /*
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-1999 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 /* ev_timers.c - implement timers for the eventlib
  * vix 09sep95 [initial]
  */

 #include <sys/cdefs.h>
 #if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
 #ifdef notdef
 static const char rcsid[] = "Id: ev_timers.c,v 1.6 2005/04/27 04:56:36 sra Exp";
 #else
 __RCSID("$NetBSD: ev_timers.c,v 1.11 2012/03/21 00:34:54 christos Exp $");
 #endif
 #endif

 /* Import. */

 #include "port_before.h"
 #include "fd_setsize.h"

 #include <errno.h>

 #include <isc/assertions.h>
 #include <isc/eventlib.h>
 #include "eventlib_p.h"

 #include "port_after.h"

 /* Constants. */

 #define	MILLION 1000000
 #define BILLION 1000000000

 /* Forward. */

 #ifndef _LIBC
 static int due_sooner(void *, void *);
 static void set_index(void *, int);
 static void free_timer(void *, void *);
 static void print_timer(void *, void *);
 static void idle_timeout(evContext, void *, struct timespec, struct timespec);

 /* Private type. */

 typedef struct {
 	evTimerFunc	func;
 	void *		uap;
 	struct timespec	lastTouched;
 	struct timespec	max_idle;
 	evTimer *	timer;
 } idle_timer;
 #endif

 /* Public. */

 struct timespec
 evConsTime(time_t sec, long nsec) {
 	struct timespec x;

 	x.tv_sec = sec;
 	x.tv_nsec = nsec;
 	return (x);
 }

 struct timespec
 evAddTime(struct timespec addend1, struct timespec addend2) {
 	struct timespec x;

 	x.tv_sec = addend1.tv_sec + addend2.tv_sec;
 	x.tv_nsec = addend1.tv_nsec + addend2.tv_nsec;
 	if (x.tv_nsec >= BILLION) {
 		x.tv_sec++;
 		x.tv_nsec -= BILLION;
 	}
 	return (x);
 }

 struct timespec
 evSubTime(struct timespec minuend, struct timespec subtrahend) {
 	struct timespec x;

 	x.tv_sec = minuend.tv_sec - subtrahend.tv_sec;
 	if (minuend.tv_nsec >= subtrahend.tv_nsec)
 		x.tv_nsec = minuend.tv_nsec - subtrahend.tv_nsec;
 	else {
 		x.tv_nsec = BILLION - subtrahend.tv_nsec + minuend.tv_nsec;
 		x.tv_sec--;
 	}
 	return (x);
 }

 int
 evCmpTime(struct timespec a, struct timespec b) {
 #define SGN(x) ((x) < 0 ? (-1) : (x) > 0 ? (1) : (0));
 	time_t s = a.tv_sec - b.tv_sec;
 	long n;

 	if (s != 0)
 		return SGN(s);

 	n = a.tv_nsec - b.tv_nsec;
 	return SGN(n);
 }

 struct timespec
 evNowTime(void)
 {
 	struct timeval now;
 #ifdef CLOCK_REALTIME
 	struct timespec tsnow;
 	int m = CLOCK_REALTIME;

 #ifdef CLOCK_MONOTONIC
 #ifndef _LIBC
 	if (__evOptMonoTime)
 		m = CLOCK_MONOTONIC;
 #endif
 #endif
 	if (clock_gettime(m, &tsnow) == 0)
 		return (tsnow);
 #endif
 	if (gettimeofday(&now, NULL) < 0)
 		return (evConsTime((time_t)0, 0L));
 	return (evTimeSpec(now));
 }

 struct timespec
 evUTCTime(void) {
 	struct timeval now;
 #ifdef CLOCK_REALTIME
 	struct timespec tsnow;
 	if (clock_gettime(CLOCK_REALTIME, &tsnow) == 0)
 		return (tsnow);
 #endif
 	if (gettimeofday(&now, NULL) < 0)
 		return (evConsTime((time_t)0, 0L));
 	return (evTimeSpec(now));
 }

 #ifndef _LIBC
 struct timespec
 evLastEventTime(evContext opaqueCtx) {
 	evContext_p *ctx = opaqueCtx.opaque;

 	return (ctx->lastEventTime);
 }
 #endif

 struct timespec
 evTimeSpec(struct timeval tv) {
 	struct timespec ts;

 	ts.tv_sec = tv.tv_sec;
 	ts.tv_nsec = tv.tv_usec * 1000;
 	return (ts);
 }

 struct timeval
 evTimeVal(struct timespec ts) {
 	struct timeval tv;

 	tv.tv_sec = ts.tv_sec;
 	tv.tv_usec = (suseconds_t)(ts.tv_nsec / 1000);
 	return (tv);
 }

 #ifndef _LIBC
 int
 evSetTimer(evContext opaqueCtx,
 	   evTimerFunc func,
 	   void *uap,
 	   struct timespec due,
 	   struct timespec inter,
 	   evTimerID *opaqueID
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *id;

 	evPrintf(ctx, 1,
 "evSetTimer(ctx %p, func %p, uap %p, due %ld.%09ld, inter %ld.%09ld)\n",
 		 ctx, func, uap,
 		 (long)due.tv_sec, due.tv_nsec,
 		 (long)inter.tv_sec, inter.tv_nsec);

 #ifdef __hpux
 	/*
 	 * tv_sec and tv_nsec are unsigned.
 	 */
 	if (due.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);

 	if (inter.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);
 #else
 	if (due.tv_sec < 0 || due.tv_nsec < 0 || due.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);

 	if (inter.tv_sec < 0 || inter.tv_nsec < 0 || inter.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);
 #endif

 	/* due={0,0} is a magic cookie meaning "now." */
 	if (due.tv_sec == (time_t)0 && due.tv_nsec == 0L)
 		due = evNowTime();

 	/* Allocate and fill. */
 	OKNEW(id);
 	id->func = func;
 	id->uap = uap;
 	id->due = due;
 	id->inter = inter;

 	if (heap_insert(ctx->timers, id) < 0)
 		return (-1);

 	/* Remember the ID if the caller provided us a place for it. */
 	if (opaqueID)
 		opaqueID->opaque = id;

 	if (ctx->debug > 7) {
 		evPrintf(ctx, 7, "timers after evSetTimer:\n");
 		(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
 	}

 	return (0);
 }

 int
 evClearTimer(evContext opaqueCtx, evTimerID id) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *del = id.opaque;

 	if (ctx->cur != NULL &&
 	    ctx->cur->type == Timer &&
 	    ctx->cur->u.timer.this == del) {
 		evPrintf(ctx, 8, "deferring delete of timer (executing)\n");
 		/*
 		 * Setting the interval to zero ensures that evDrop() will
 		 * clean up the timer.
 		 */
 		del->inter = evConsTime(0, 0);
 		return (0);
 	}

 	if (heap_element(ctx->timers, del->index) != del)
 		EV_ERR(ENOENT);

 	if (heap_delete(ctx->timers, del->index) < 0)
 		return (-1);
 	FREE(del);

 	if (ctx->debug > 7) {
 		evPrintf(ctx, 7, "timers after evClearTimer:\n");
 		(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
 	}

 	return (0);
 }

 int
 evConfigTimer(evContext opaqueCtx,
 	     evTimerID id,
 	     const char *param,
 	     int value
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *timer = id.opaque;
 	int result=0;

 	UNUSED(value);

 	if (heap_element(ctx->timers, timer->index) != timer)
 		EV_ERR(ENOENT);

 	if (strcmp(param, "rate") == 0)
 		timer->mode |= EV_TMR_RATE;
 	else if (strcmp(param, "interval") == 0)
 		timer->mode &= ~EV_TMR_RATE;
 	else
 		EV_ERR(EINVAL);

 	return (result);
 }

 int
 evResetTimer(evContext opaqueCtx,
 	     evTimerID id,
 	     evTimerFunc func,
 	     void *uap,
 	     struct timespec due,
 	     struct timespec inter
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *timer = id.opaque;
 	struct timespec old_due;
 	int result=0;

 	if (heap_element(ctx->timers, timer->index) != timer)
 		EV_ERR(ENOENT);

 #ifdef __hpux
 	/*
 	 * tv_sec and tv_nsec are unsigned.
 	 */
 	if (due.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);

 	if (inter.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);
 #else
 	if (due.tv_sec < 0 || due.tv_nsec < 0 || due.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);

 	if (inter.tv_sec < 0 || inter.tv_nsec < 0 || inter.tv_nsec >= BILLION)
 		EV_ERR(EINVAL);
 #endif

 	old_due = timer->due;

 	timer->func = func;
 	timer->uap = uap;
 	timer->due = due;
 	timer->inter = inter;

 	switch (evCmpTime(due, old_due)) {
 	case -1:
 		result = heap_increased(ctx->timers, timer->index);
 		break;
 	case 0:
 		result = 0;
 		break;
 	case 1:
 		result = heap_decreased(ctx->timers, timer->index);
 		break;
 	}

 	if (ctx->debug > 7) {
 		evPrintf(ctx, 7, "timers after evResetTimer:\n");
 		(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
 	}

 	return (result);
 }

 int
 evSetIdleTimer(evContext opaqueCtx,
 		evTimerFunc func,
 		void *uap,
 		struct timespec max_idle,
 		evTimerID *opaqueID
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	idle_timer *tt;

 	/* Allocate and fill. */
 	OKNEW(tt);
 	tt->func = func;
 	tt->uap = uap;
 	tt->lastTouched = ctx->lastEventTime;
 	tt->max_idle = max_idle;

 	if (evSetTimer(opaqueCtx, idle_timeout, tt,
 		       evAddTime(ctx->lastEventTime, max_idle),
 		       max_idle, opaqueID) < 0) {
 		FREE(tt);
 		return (-1);
 	}

 	tt->timer = opaqueID->opaque;

 	return (0);
 }

 int
 evClearIdleTimer(evContext opaqueCtx, evTimerID id) {
 	evTimer *del = id.opaque;
 	idle_timer *tt = del->uap;

 	FREE(tt);
 	return (evClearTimer(opaqueCtx, id));
 }

 int
 evResetIdleTimer(evContext opaqueCtx,
 		 evTimerID opaqueID,
 		 evTimerFunc func,
 		 void *uap,
 		 struct timespec max_idle
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *timer = opaqueID.opaque;
 	idle_timer *tt = timer->uap;

 	tt->func = func;
 	tt->uap = uap;
 	tt->lastTouched = ctx->lastEventTime;
 	tt->max_idle = max_idle;

 	return (evResetTimer(opaqueCtx, opaqueID, idle_timeout, tt,
 			     evAddTime(ctx->lastEventTime, max_idle),
 			     max_idle));
 }

 int
 evTouchIdleTimer(evContext opaqueCtx, evTimerID id) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	evTimer *t = id.opaque;
 	idle_timer *tt = t->uap;

 	tt->lastTouched = ctx->lastEventTime;

 	return (0);
 }

 /* Public to the rest of eventlib. */

 heap_context
 evCreateTimers(const evContext_p *ctx) {

 	UNUSED(ctx);

 	return (heap_new(due_sooner, set_index, 2048));
 }

 void
 evDestroyTimers(const evContext_p *ctx) {
 	(void) heap_for_each(ctx->timers, free_timer, NULL);
 	(void) heap_free(ctx->timers);
 }

 /* Private. */

 static int
 due_sooner(void *a, void *b) {
 	evTimer *a_timer, *b_timer;

 	a_timer = a;
 	b_timer = b;
 	return (evCmpTime(a_timer->due, b_timer->due) < 0);
 }

 static void
 set_index(void *what, int idx) {
 	evTimer *timer;

 	timer = what;
 	timer->index = idx;
 }

 static void
 free_timer(void *what, void *uap) {
 	evTimer *t = what;

 	UNUSED(uap);

 	FREE(t);
 }

 static void
 print_timer(void *what, void *uap) {
 	evTimer *cur = what;
 	evContext_p *ctx = uap;

 	cur = what;
 	evPrintf(ctx, 7,
 	    "  func %p, uap %p, due %ld.%09ld, inter %ld.%09ld\n",
 		 cur->func, cur->uap,
 		 (long)cur->due.tv_sec, cur->due.tv_nsec,
 		 (long)cur->inter.tv_sec, cur->inter.tv_nsec);
 }

 static void
 idle_timeout(evContext opaqueCtx,
 	     void *uap,
 	     struct timespec due,
 	     struct timespec inter
 ) {
 	evContext_p *ctx = opaqueCtx.opaque;
 	idle_timer *this = uap;
 	struct timespec idle;

 	UNUSED(due);
 	UNUSED(inter);

 	idle = evSubTime(ctx->lastEventTime, this->lastTouched);
 	if (evCmpTime(idle, this->max_idle) >= 0) {
 		(this->func)(opaqueCtx, this->uap, this->timer->due,
 			     this->max_idle);
 		/*
 		 * Setting the interval to zero will cause the timer to
 		 * be cleaned up in evDrop().
 		 */
 		this->timer->inter = evConsTime(0L, 0L);
 		FREE(this);
 	} else {
 		/* evDrop() will reschedule the timer. */
 		this->timer->inter = evSubTime(this->max_idle, idle);
 	}
 }
 #endif

 /*! \file */
	/* $NetBSD: ev_timers.c,v 1.11 2012/03/21 00:34:54 christos Exp $ */

	/*
	* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
	* Copyright (c) 1995-1999 by Internet Software Consortium
	*
	* Permission to use, copy, modify, and distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	/* ev_timers.c - implement timers for the eventlib
	* vix 09sep95 [initial]
	*/

	#include <sys/cdefs.h>
	#if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
	#ifdef notdef
	static const char rcsid[] = "Id: ev_timers.c,v 1.6 2005/04/27 04:56:36 sra Exp";
	#else
	__RCSID("$NetBSD: ev_timers.c,v 1.11 2012/03/21 00:34:54 christos Exp $");
	#endif
	#endif

	/* Import. */

	#include "port_before.h"
	#include "fd_setsize.h"

	#include <errno.h>

	#include <isc/assertions.h>
	#include <isc/eventlib.h>
	#include "eventlib_p.h"

	#include "port_after.h"

	/* Constants. */

	#define MILLION 1000000
	#define BILLION 1000000000

	/* Forward. */

	#ifndef _LIBC
	static int due_sooner(void , void );
	static void set_index(void *, int);
	static void free_timer(void , void );
	static void print_timer(void , void );
	static void idle_timeout(evContext, void *, struct timespec, struct timespec);

	/* Private type. */

	typedef struct {
	evTimerFunc func;
	void * uap;
	struct timespec lastTouched;
	struct timespec max_idle;
	evTimer * timer;
	} idle_timer;
	#endif

	/* Public. */

	struct timespec
	evConsTime(time_t sec, long nsec) {
	struct timespec x;

	x.tv_sec = sec;
	x.tv_nsec = nsec;
	return (x);
	}

	struct timespec
	evAddTime(struct timespec addend1, struct timespec addend2) {
	struct timespec x;

	x.tv_sec = addend1.tv_sec + addend2.tv_sec;
	x.tv_nsec = addend1.tv_nsec + addend2.tv_nsec;
	if (x.tv_nsec >= BILLION) {
	x.tv_sec++;
	x.tv_nsec -= BILLION;
	}
	return (x);
	}

	struct timespec
	evSubTime(struct timespec minuend, struct timespec subtrahend) {
	struct timespec x;

	x.tv_sec = minuend.tv_sec - subtrahend.tv_sec;
	if (minuend.tv_nsec >= subtrahend.tv_nsec)
	x.tv_nsec = minuend.tv_nsec - subtrahend.tv_nsec;
	else {
	x.tv_nsec = BILLION - subtrahend.tv_nsec + minuend.tv_nsec;
	x.tv_sec--;
	}
	return (x);
	}

	int
	evCmpTime(struct timespec a, struct timespec b) {
	#define SGN(x) ((x) < 0 ? (-1) : (x) > 0 ? (1) : (0));
	time_t s = a.tv_sec - b.tv_sec;
	long n;

	if (s != 0)
	return SGN(s);

	n = a.tv_nsec - b.tv_nsec;
	return SGN(n);
	}

	struct timespec
	evNowTime(void)
	{
	struct timeval now;
	#ifdef CLOCK_REALTIME
	struct timespec tsnow;
	int m = CLOCK_REALTIME;

	#ifdef CLOCK_MONOTONIC
	#ifndef _LIBC
	if (__evOptMonoTime)
	m = CLOCK_MONOTONIC;
	#endif
	#endif
	if (clock_gettime(m, &tsnow) == 0)
	return (tsnow);
	#endif
	if (gettimeofday(&now, NULL) < 0)
	return (evConsTime((time_t)0, 0L));
	return (evTimeSpec(now));
	}

	struct timespec
	evUTCTime(void) {
	struct timeval now;
	#ifdef CLOCK_REALTIME
	struct timespec tsnow;
	if (clock_gettime(CLOCK_REALTIME, &tsnow) == 0)
	return (tsnow);
	#endif
	if (gettimeofday(&now, NULL) < 0)
	return (evConsTime((time_t)0, 0L));
	return (evTimeSpec(now));
	}

	#ifndef _LIBC
	struct timespec
	evLastEventTime(evContext opaqueCtx) {
	evContext_p *ctx = opaqueCtx.opaque;

	return (ctx->lastEventTime);
	}
	#endif

	struct timespec
	evTimeSpec(struct timeval tv) {
	struct timespec ts;

	ts.tv_sec = tv.tv_sec;
	ts.tv_nsec = tv.tv_usec * 1000;
	return (ts);
	}

	struct timeval
	evTimeVal(struct timespec ts) {
	struct timeval tv;

	tv.tv_sec = ts.tv_sec;
	tv.tv_usec = (suseconds_t)(ts.tv_nsec / 1000);
	return (tv);
	}

	#ifndef _LIBC
	int
	evSetTimer(evContext opaqueCtx,
	evTimerFunc func,
	void *uap,
	struct timespec due,
	struct timespec inter,
	evTimerID *opaqueID
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *id;

	evPrintf(ctx, 1,
	"evSetTimer(ctx %p, func %p, uap %p, due %ld.%09ld, inter %ld.%09ld)\n",
	ctx, func, uap,
	(long)due.tv_sec, due.tv_nsec,
	(long)inter.tv_sec, inter.tv_nsec);

	#ifdef __hpux
	/*
	* tv_sec and tv_nsec are unsigned.
	*/
	if (due.tv_nsec >= BILLION)
	EV_ERR(EINVAL);

	if (inter.tv_nsec >= BILLION)
	EV_ERR(EINVAL);
	#else
	if (due.tv_sec < 0 \|\| due.tv_nsec < 0 \|\| due.tv_nsec >= BILLION)
	EV_ERR(EINVAL);

	if (inter.tv_sec < 0 \|\| inter.tv_nsec < 0 \|\| inter.tv_nsec >= BILLION)
	EV_ERR(EINVAL);
	#endif

	/* due={0,0} is a magic cookie meaning "now." */
	if (due.tv_sec == (time_t)0 && due.tv_nsec == 0L)
	due = evNowTime();

	/* Allocate and fill. */
	OKNEW(id);
	id->func = func;
	id->uap = uap;
	id->due = due;
	id->inter = inter;

	if (heap_insert(ctx->timers, id) < 0)
	return (-1);

	/* Remember the ID if the caller provided us a place for it. */
	if (opaqueID)
	opaqueID->opaque = id;

	if (ctx->debug > 7) {
	evPrintf(ctx, 7, "timers after evSetTimer:\n");
	(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
	}

	return (0);
	}

	int
	evClearTimer(evContext opaqueCtx, evTimerID id) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *del = id.opaque;

	if (ctx->cur != NULL &&
	ctx->cur->type == Timer &&
	ctx->cur->u.timer.this == del) {
	evPrintf(ctx, 8, "deferring delete of timer (executing)\n");
	/*
	* Setting the interval to zero ensures that evDrop() will
	* clean up the timer.
	*/
	del->inter = evConsTime(0, 0);
	return (0);
	}

	if (heap_element(ctx->timers, del->index) != del)
	EV_ERR(ENOENT);

	if (heap_delete(ctx->timers, del->index) < 0)
	return (-1);
	FREE(del);

	if (ctx->debug > 7) {
	evPrintf(ctx, 7, "timers after evClearTimer:\n");
	(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
	}

	return (0);
	}

	int
	evConfigTimer(evContext opaqueCtx,
	evTimerID id,
	const char *param,
	int value
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *timer = id.opaque;
	int result=0;

	UNUSED(value);

	if (heap_element(ctx->timers, timer->index) != timer)
	EV_ERR(ENOENT);

	if (strcmp(param, "rate") == 0)
	timer->mode \|= EV_TMR_RATE;
	else if (strcmp(param, "interval") == 0)
	timer->mode &= ~EV_TMR_RATE;
	else
	EV_ERR(EINVAL);

	return (result);
	}

	int
	evResetTimer(evContext opaqueCtx,
	evTimerID id,
	evTimerFunc func,
	void *uap,
	struct timespec due,
	struct timespec inter
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *timer = id.opaque;
	struct timespec old_due;
	int result=0;

	if (heap_element(ctx->timers, timer->index) != timer)
	EV_ERR(ENOENT);

	#ifdef __hpux
	/*
	* tv_sec and tv_nsec are unsigned.
	*/
	if (due.tv_nsec >= BILLION)
	EV_ERR(EINVAL);

	if (inter.tv_nsec >= BILLION)
	EV_ERR(EINVAL);
	#else
	if (due.tv_sec < 0 \|\| due.tv_nsec < 0 \|\| due.tv_nsec >= BILLION)
	EV_ERR(EINVAL);

	if (inter.tv_sec < 0 \|\| inter.tv_nsec < 0 \|\| inter.tv_nsec >= BILLION)
	EV_ERR(EINVAL);
	#endif

	old_due = timer->due;

	timer->func = func;
	timer->uap = uap;
	timer->due = due;
	timer->inter = inter;

	switch (evCmpTime(due, old_due)) {
	case -1:
	result = heap_increased(ctx->timers, timer->index);
	break;
	case 0:
	result = 0;
	break;
	case 1:
	result = heap_decreased(ctx->timers, timer->index);
	break;
	}

	if (ctx->debug > 7) {
	evPrintf(ctx, 7, "timers after evResetTimer:\n");
	(void) heap_for_each(ctx->timers, print_timer, (void *)ctx);
	}

	return (result);
	}

	int
	evSetIdleTimer(evContext opaqueCtx,
	evTimerFunc func,
	void *uap,
	struct timespec max_idle,
	evTimerID *opaqueID
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	idle_timer *tt;

	/* Allocate and fill. */
	OKNEW(tt);
	tt->func = func;
	tt->uap = uap;
	tt->lastTouched = ctx->lastEventTime;
	tt->max_idle = max_idle;

	if (evSetTimer(opaqueCtx, idle_timeout, tt,
	evAddTime(ctx->lastEventTime, max_idle),
	max_idle, opaqueID) < 0) {
	FREE(tt);
	return (-1);
	}

	tt->timer = opaqueID->opaque;

	return (0);
	}

	int
	evClearIdleTimer(evContext opaqueCtx, evTimerID id) {
	evTimer *del = id.opaque;
	idle_timer *tt = del->uap;

	FREE(tt);
	return (evClearTimer(opaqueCtx, id));
	}

	int
	evResetIdleTimer(evContext opaqueCtx,
	evTimerID opaqueID,
	evTimerFunc func,
	void *uap,
	struct timespec max_idle
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *timer = opaqueID.opaque;
	idle_timer *tt = timer->uap;

	tt->func = func;
	tt->uap = uap;
	tt->lastTouched = ctx->lastEventTime;
	tt->max_idle = max_idle;

	return (evResetTimer(opaqueCtx, opaqueID, idle_timeout, tt,
	evAddTime(ctx->lastEventTime, max_idle),
	max_idle));
	}

	int
	evTouchIdleTimer(evContext opaqueCtx, evTimerID id) {
	evContext_p *ctx = opaqueCtx.opaque;
	evTimer *t = id.opaque;
	idle_timer *tt = t->uap;

	tt->lastTouched = ctx->lastEventTime;

	return (0);
	}

	/* Public to the rest of eventlib. */

	heap_context
	evCreateTimers(const evContext_p *ctx) {

	UNUSED(ctx);

	return (heap_new(due_sooner, set_index, 2048));
	}

	void
	evDestroyTimers(const evContext_p *ctx) {
	(void) heap_for_each(ctx->timers, free_timer, NULL);
	(void) heap_free(ctx->timers);
	}

	/* Private. */

	static int
	due_sooner(void a, void b) {
	evTimer a_timer, b_timer;

	a_timer = a;
	b_timer = b;
	return (evCmpTime(a_timer->due, b_timer->due) < 0);
	}

	static void
	set_index(void *what, int idx) {
	evTimer *timer;

	timer = what;
	timer->index = idx;
	}

	static void
	free_timer(void what, void uap) {
	evTimer *t = what;

	UNUSED(uap);

	FREE(t);
	}

	static void
	print_timer(void what, void uap) {
	evTimer *cur = what;
	evContext_p *ctx = uap;

	cur = what;
	evPrintf(ctx, 7,
	" func %p, uap %p, due %ld.%09ld, inter %ld.%09ld\n",
	cur->func, cur->uap,
	(long)cur->due.tv_sec, cur->due.tv_nsec,
	(long)cur->inter.tv_sec, cur->inter.tv_nsec);
	}

	static void
	idle_timeout(evContext opaqueCtx,
	void *uap,
	struct timespec due,
	struct timespec inter
	) {
	evContext_p *ctx = opaqueCtx.opaque;
	idle_timer *this = uap;
	struct timespec idle;

	UNUSED(due);
	UNUSED(inter);

	idle = evSubTime(ctx->lastEventTime, this->lastTouched);
	if (evCmpTime(idle, this->max_idle) >= 0) {
	(this->func)(opaqueCtx, this->uap, this->timer->due,
	this->max_idle);
	/*
	* Setting the interval to zero will cause the timer to
	* be cleaned up in evDrop().
	*/
	this->timer->inter = evConsTime(0L, 0L);
	FREE(this);
	} else {
	/* evDrop() will reschedule the timer. */
	this->timer->inter = evSubTime(this->max_idle, idle);
	}
	}
	#endif

	/! \file /