>the function schedule_timeout in sched.c does the following:
>
> expire = timeout + j
>
> init_timer(&timer);
> timer.expires = expire;
> timer.data = (unsigned long) current;
> timer.function = process_timeout;
>
> add_timer(&timer);
> schedule();
[xx]
> del_timer(&timer);
>
> timeout = expire - jiffies;
>
>How can the timer expire, when it is deleted
>immediate after scheduling?
The the timer is there only to wakeup the task. When you reach point [xx]
you are just running so you don't need a wakeup anymore.
Note also that the timer is local in the stack so it must be deleted to
not crash into the timer irq.
>Is there an other way to set a process sleep like the one in
>version 2.0.x
>
> current->timeout = jiffies + t;
> current->state = TASK_INTERRUPTIBLE;
> schedule();
> current->timeout = 0;
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(t);
Andrea Arcangeli
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