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        lbolt - Global Variable: Is a periodic wakeup mechanism
        extern time_t lbolt;
        You  use  the  lbolt global variable  as a periodic wakeup
       mechanism. Wakeups are done on the lbolt variable once per
       second. For example, if a kernel module was polling for an
       event once per second, you could use the following code:
        .
        .
        .  sleep((caddr_t) &lbolt, PZERO);
        .
        .
        .
                                                        lbolt(9v)
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