66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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#include <atomic.h>
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#ifdef USE_SMP
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typedef struct
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{
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atomic_t val;
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} spinlock_t;
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/*
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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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*/
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#define SPINLOCK_DECLARE(slname) spinlock_t slname
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/*
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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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*/
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#define SPINLOCK_INITIALIZE(slname) \
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spinlock_t slname = { \
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.val = { 0 } \
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}
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extern void spinlock_initialize(spinlock_t *sl);
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extern int spinlock_trylock(spinlock_t *sl);
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#define spinlock_lock(x) atomic_lock_arch(&(x)->val)
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/** Unlock spinlock
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*
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* Unlock spinlock.
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*
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* @param sl Pointer to spinlock_t structure.
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*/
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static inline void spinlock_unlock(spinlock_t *sl)
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{
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ASSERT(atomic_get(&sl->val) != 0);
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/*
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* Prevent critical section code from bleeding out this way down.
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*/
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// CS_LEAVE_BARRIER();
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atomic_set(&sl->val, 0);
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// preemption_enable();
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}
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#else
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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_EXTERN(name)
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#define SPINLOCK_INITIALIZE(name)
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#define spinlock_initialize(x)
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#define spinlock_lock(x)
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#define spinlock_trylock(x)
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#define spinlock_unlock(x)
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#endif
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