minix/lib/libc/isc/ev_timers.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

518 lines
10 KiB
C

/* $NetBSD: ev_timers.c,v 1.8 2009/04/12 17:07:17 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 1.8 2009/04/12 17:07:17 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() {
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(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;
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 */