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/*
Copyright (C) 1995 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>
static void
timer_function (any_t timerp)
{
struct timer_list *timer = timerp;
mach_port_t recv;
error_t err;
recv = mach_reply_port ();
timer->thread = mach_thread_self ();
err = mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
0, 0, recv, timer->expires, MACH_PORT_NULL);
timer->thread = MACH_PORT_NULL;
mach_port_destroy (mach_task_self (), recv);
if (!err)
{
begin_interrupt ();
(*timer->function)(timer->data);
end_interrupt ();
}
}
void
add_timer (struct timer_list *timer)
{
timer->thread = -1;
cthread_detach (cthread_fork ((cthread_fn_t) timer_function, timer));
}
int
del_timer (struct timer_list *timer)
{
thread_t thread;
if (timer->thread == -1)
{
/* It hasn't had a chance to set its ID. Wait a bit
until it does. */
do
swtch_pri (0);
while (timer->thread == -1);
}
thread = timer->thread;
if (thread == MACH_PORT_NULL)
return 0; /* ??? */
thread_suspend (thread);
/* Test again, because it might have run and completed the mach_msg after
we tested above and before we suspended, and we don't want to abort
the mach_port_destroy and certainly not anything inside the timer function\
which might have started running. */
if (timer->thread)
thread_abort (thread);
thread_resume (thread);
/* What to return? */
return 0; /* ???*/
}
void
init_timer (struct timer_list *timer)
{
timer->thread = MACH_PORT_NULL;
}
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