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/*
Copyright (C) 1995,96,2000 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
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 2, 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <linux/timer.h>
#include <asm/system.h>
#include <linux/sched.h>
#include <error.h>
#include <string.h>
#include "pfinet.h"
long long root_jiffies;
volatile struct mapped_time_value *mapped_time;
struct timer_list *timers;
thread_t timer_thread = 0;
static int
timer_function (int this_is_a_pointless_variable_with_a_rather_long_name)
{
mach_port_t recv;
int wait = 0;
recv = mach_reply_port ();
timer_thread = mach_thread_self ();
__mutex_lock (&global_lock);
while (1)
{
int jiff = jiffies;
if (!timers)
wait = -1;
else if (timers->expires < jiff)
wait = 0;
else
wait = ((timers->expires - jiff) * 1000) / HZ;
__mutex_unlock (&global_lock);
mach_msg (NULL, (MACH_RCV_MSG | MACH_RCV_INTERRUPT
| (wait == -1 ? 0 : MACH_RCV_TIMEOUT)),
0, 0, recv, wait, MACH_PORT_NULL);
__mutex_lock (&global_lock);
while (timers->expires < jiffies)
{
struct timer_list *tp;
tp = timers;
timers = timers->next;
if (timers)
timers->prev = &timers;
tp->next = 0;
tp->prev = 0;
(*tp->function) (tp->data);
}
}
}
void
add_timer (struct timer_list *timer)
{
struct timer_list **tp;
for (tp = &timers; *tp; tp = &(*tp)->next)
if ((*tp)->expires > timer->expires)
{
timer->next = *tp;
timer->next->prev = &timer->next;
timer->prev = tp;
*tp = timer;
break;
}
if (!*tp)
{
timer->next = 0;
timer->prev = tp;
*tp = timer;
}
if (timers == timer)
{
/* We have change the first one, so tweak the timer thread
to push things up. */
while (timer_thread == 0)
swtch_pri (0);
if (timer_thread != mach_thread_self ())
{
thread_suspend (timer_thread);
thread_abort (timer_thread);
thread_resume (timer_thread);
}
}
}
int
del_timer (struct timer_list *timer)
{
if (timer->prev)
{
*timer->prev = timer->next;
if (timer->next)
timer->next->prev = timer->prev;
timer->next = 0;
timer->prev = 0;
return 1;
}
else
return 0;
}
void
mod_timer (struct timer_list *timer, unsigned long expires)
{
/* Should optimize this. */
del_timer (timer);
timer->expires = expires;
add_timer (timer);
}
void
init_timer (struct timer_list *timer)
{
bzero (timer, sizeof (struct timer_list));
}
void
init_time ()
{
error_t err;
struct timeval tp;
err = maptime_map (0, 0, &mapped_time);
if (err)
error (2, err, "cannot map time device");
maptime_read (mapped_time, &tp);
root_jiffies = (long long) tp.tv_sec * HZ
+ ((long long) tp.tv_usec * HZ) / 1000000;
cthread_detach (cthread_fork ((cthread_fn_t) timer_function, 0));
}
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