diff options
Diffstat (limited to 'libc/netbsd/isc/ev_timers.c')
-rw-r--r-- | libc/netbsd/isc/ev_timers.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/libc/netbsd/isc/ev_timers.c b/libc/netbsd/isc/ev_timers.c new file mode 100644 index 0000000..9674687 --- /dev/null +++ b/libc/netbsd/isc/ev_timers.c @@ -0,0 +1,504 @@ +/* $NetBSD: ev_timers.c,v 1.2 2004/05/20 19:52:31 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 1.2.2.1.4.5 2004/03/17 02:39:13 marka Exp"; +#else +__RCSID("$NetBSD: ev_timers.c,v 1.2 2004/05/20 19:52:31 christos Exp $"); +#endif +#endif + +/* Import. */ + +#include <errno.h> + +#include <isc/assertions.h> +#include <isc/eventlib.h> +#include "eventlib_p.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) { + long x = a.tv_sec - b.tv_sec; + + if (x == 0L) + x = a.tv_nsec - b.tv_nsec; + return (x < 0L ? (-1) : x > 0L ? (1) : (0)); +} + +struct timespec +evNowTime() { + struct timeval now; +#ifdef CLOCK_REALTIME + struct timespec tsnow; + int m = CLOCK_REALTIME; + +#ifdef CLOCK_MONOTONIC + if (__evOptMonoTime) + m = CLOCK_MONOTONIC; +#endif + if (clock_gettime(m, &tsnow) == 0) + return (tsnow); +#endif + if (gettimeofday(&now, NULL) < 0) + return (evConsTime(0L, 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(0L, 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 = 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; + + printf("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) { + printf("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) { + printf("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) { + printf("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) { + printf("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 |