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Rev 1375 Rev 1467
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    ipl_t ipl;
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    ipl_t ipl;
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restart:
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restart:
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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-
 
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    if (THREAD) {   /* needed during system initiailzation */
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    /*
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        /*
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     * Busy waiting for a delayed timeout.
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         * Busy waiting for a delayed timeout.
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     * This is an important fix for the race condition between
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         * This is an important fix for the race condition between
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     * a delayed timeout and a next call to waitq_sleep_timeout().
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         * a delayed timeout and a next call to waitq_sleep_timeout().
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     * Simply, the thread is not allowed to go to sleep if
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         * Simply, the thread is not allowed to go to sleep if
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        spinlock_unlock(&THREAD->lock);
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            spinlock_unlock(&THREAD->lock);
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        interrupts_restore(ipl);
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            interrupts_restore(ipl);
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        goto restart;
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            goto restart;
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    }
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        }
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    spinlock_unlock(&THREAD->lock);
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        spinlock_unlock(&THREAD->lock);
-
 
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    }
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    spinlock_lock(&wq->lock);
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    spinlock_lock(&wq->lock);
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    return ipl;
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    return ipl;
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}
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}
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