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/*
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/*
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 * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,
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 * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,
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 * where the lock gets initialized in run time.
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 * where the lock gets initialized in run time.
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 */
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 */
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#define SPINLOCK_DECLARE(slname)    spinlock_t slname
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#define SPINLOCK_DECLARE(slname)    spinlock_t slname
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#define SPINLOCK_EXTERN(slname)     extern spinlock_t slname
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/*
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/*
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 * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.
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 * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.
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 * It declares and initializes the lock.
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 * It declares and initializes the lock.
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 */
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 */
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    preemption_enable();
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    preemption_enable();
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}
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}
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#else
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#else
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typedef void spinlock_t;
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/* On UP systems, spinlocks are effectively left out. */
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/* On UP systems, spinlocks are effectively left out. */
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#define SPINLOCK_DECLARE(name)
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#define SPINLOCK_DECLARE(name)
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#define SPINLOCK_EXTERN(name)
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#define SPINLOCK_INITIALIZE(name)
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#define SPINLOCK_INITIALIZE(name)
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#define spinlock_initialize(x, name)
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#define spinlock_initialize(x, name)
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#define spinlock_lock(x)        preemption_disable()
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#define spinlock_lock(x)        preemption_disable()
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#define spinlock_trylock(x)         (preemption_disable(), 1)
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#define spinlock_trylock(x)         (preemption_disable(), 1)