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/* timer.c - Architecture independent timer implemenation.
Copyright (C) 2009 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>. */
#include "timer.h"
#include "timer-arch.h"
#include "bottom-half.h"
volatile struct vg_time time_data __attribute__ ((aligned (PAGESIZE)));
void
timer_bootstrap (void)
{
timer_arch_bootstrap ();
}
/* Sorted by TIMER->EXPIRE. */
struct timer *timers;
/* Whether a bottom half handler has been registered to run a
timer. */
bool timer_bottom_half_pending;
static void
timer_bottom_half_callback (struct bottom_half *bh)
{
timer_bottom_half_pending = false;
while (timers && unlikely (timers->expire <= time_data.ns_since_boot))
{
struct timer *t = timers;
timers = t->next;
t->next = 0;
t->callback (t);
}
}
void
timer_register (struct timer *timer)
{
assert (! timer->next);
struct timer *t;
struct timer **prevp;
for (t = timers, prevp = &timers; t; prevp = &t->next, t = t->next)
if (t->expire > timer->expire)
break;
timer->next = *prevp;
*prevp = timer;
if (t)
{
timer->prev = t->prev;
t->prev = timer;
}
else
timer->prev = 0;
}
void
timer_cancel (struct timer *timer)
{
if (! timer->prev)
assert (timer == timers);
else
assert (timer->prev->next == timer);
if (timer->next)
assert (timer->next->prev == timer);
if (timer->next)
timer->next->prev = timer->prev;
if (timer->prev)
timer->prev = timer->next;
else
timers = timer->next;
#ifndef NDEBUG
timer->next = timer->prev = 0;
#endif
}
void
timer_check_hard (void)
{
if (timers && unlikely (timers->expire <= time_data.ns_since_boot)
&& ! timer_bottom_half_pending)
{
static struct bottom_half timer_bottom_half
= { .callback = timer_bottom_half_callback };
timer_bottom_half_pending = true;
bottom_half_register (&timer_bottom_half);
}
}
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