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    SubjectRe: [patch 04/13] syslets: core code
    On Wed, 21 Feb 2007, Ingo Molnar wrote:

    > +asmlinkage long
    > +sys_threadlet_on(unsigned long restore_stack,
    > + unsigned long restore_eip,
    > + struct async_head_user __user *ahu)
    > +{
    > + struct task_struct *t = current;
    > + struct async_head *ah = t->ah;
    > + struct async_thread *at = &t->__at;
    > + long ret;
    > +
    > + /*
    > + * Do not allow recursive calls of sys_threadlet_on():
    > + */
    > + if (t->async_ready || t->at)
    > + return -EINVAL;
    > +
    > + if (unlikely(!ah)) {
    > + ret = init_head(ah, t, ahu);
    > + if (ret)
    > + return ret;
    > + ah = t->ah;
    > + }
    > +
    > + if (unlikely(list_empty(&ah->ready_async_threads))) {
    > + ret = refill_cachemiss_pool(ah, t, ahu);
    > + if (ret)
    > + return ret;
    > + }
    > +
    > + t->async_ready = at;
    > + ah->restore_stack = restore_stack;
    > + ah->restore_eip = restore_eip;
    > +
    > + ah->ahu = ahu;
    > +
    > + return 0;
    > +}
    > +
    > +asmlinkage long sys_threadlet_off(void)
    > +{
    > + struct task_struct *t = current;
    > + struct async_head *ah = t->ah;
    > +
    > + /*
    > + * Are we still executing as head?
    > + */
    > + if (ah) {
    > + t->async_ready = NULL;
    > +
    > + return 1;
    > + }
    > +
    > + /*
    > + * We got turned into a cachemiss thread,
    > + * return to user-space, which can do
    > + * the notification, etc:
    > + */
    > + return 0;
    > +}

    If we have a new syscall that does the exec, we can save the two on/off
    calls. Also, the complete_thread() thingy can be done automatically from
    inside the kernel upon function return, by hence making the threadlet
    function look like a normal thread function:

    long thfn(void *) {

    ...
    return error;
    }

    No?



    - Davide


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