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 * @param s Semaphore.
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 * @param s Semaphore.
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 * @param val Maximal number of threads allowed to enter critical section.
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 * @param val Maximal number of threads allowed to enter critical section.
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 */
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 */
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void semaphore_initialize(semaphore_t *s, int val)
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void semaphore_initialize(semaphore_t *s, int val)
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{
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{
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    pri_t pri;
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    ipl_t ipl;
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    waitq_initialize(&s->wq);
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    waitq_initialize(&s->wq);
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    pri = cpu_priority_high();
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    ipl = interrupts_disable();
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    spinlock_lock(&s->wq.lock);
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    spinlock_lock(&s->wq.lock);
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    s->wq.missed_wakeups = val;
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    s->wq.missed_wakeups = val;
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    spinlock_unlock(&s->wq.lock);
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    spinlock_unlock(&s->wq.lock);
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    cpu_priority_restore(pri);
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    interrupts_restore(ipl);
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}
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}
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/** Semaphore down
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/** Semaphore down
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 *
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 *
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 * Semaphore down.
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 * Semaphore down.