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{
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{
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    pri_t pri;
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    pri_t pri;
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    int rc;
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    int rc;
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    pri = cpu_priority_high();
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    pri = cpu_priority_high();
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    spinlock_lock(&the->thread->lock);
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    spinlock_lock(&THREAD->lock);
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    the->thread->rwlock_holder_type = RWLOCK_WRITER;
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    THREAD->rwlock_holder_type = RWLOCK_WRITER;
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    spinlock_unlock(&the->thread->lock);   
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    spinlock_unlock(&THREAD->lock);
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    cpu_priority_restore(pri);
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    cpu_priority_restore(pri);
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    /*
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    /*
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     * Writers take the easy part.
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     * Writers take the easy part.
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     * They just need to acquire the exclusive mutex.
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     * They just need to acquire the exclusive mutex.
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{
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{
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    int rc;
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    int rc;
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    pri_t pri;
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    pri_t pri;
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    pri = cpu_priority_high();
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    pri = cpu_priority_high();
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    spinlock_lock(&the->thread->lock);
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    spinlock_lock(&THREAD->lock);
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    the->thread->rwlock_holder_type = RWLOCK_READER;
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    THREAD->rwlock_holder_type = RWLOCK_READER;
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    spinlock_unlock(&the->thread->lock);   
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    spinlock_unlock(&THREAD->lock);
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    spinlock_lock(&rwl->lock);
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    spinlock_lock(&rwl->lock);
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    /*
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    /*
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     * Find out whether we can get what we want without blocking.
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     * Find out whether we can get what we want without blocking.