Function timeout

lib/ff_kern_timeout.c:628–648

* timeout -- * Execute a function after a specified length of time. * * untimeout -- * Cancel previous timeout function call. * * callout_handle_init -- * Initialize a handle so that using it with untimeout is benign. * * See AT&T BCI Driver Reference Manual for specification. This * implementation differs from that one in that although an * identification value is re

 *    identify entries for untimeout.
 */
struct callout_handle
timeout(timeout_t *ftn, void *arg, int to_ticks)
{
    struct callout_cpu *cc;
    struct callout *new;
    struct callout_handle handle;

    cc = CC_CPU(timeout_cpu);
    CC_LOCK(cc);
    /* Fill in the next free callout structure. */
    new = SLIST_FIRST(&cc->cc_callfree);
    if (new == NULL)
        /* XXX Attempt to malloc first */
        panic("timeout table full");
    SLIST_REMOVE_HEAD(&cc->cc_callfree, c_links.sle);
    callout_reset(new, to_ticks, ftn, arg);
    handle.callout = new;
    CC_UNLOCK(cc);

    return (handle);
}

void
untimeout(timeout_t *ftn, void *arg, struct callout_handle handle)