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#ifndef _RISCV_ATOMIC_H
#define _RISCV_ATOMIC_H
typedef struct { long val; } atomic_t;
typedef struct { atomic_t lock; } spinlock_t;
#define SPINLOCK_INIT {{0}}
static inline long atomic_add(atomic_t* a, long inc)
{
//return __sync_fetch_and_add(&a->val, inc);
long ret = a->val;
a->val++;
return ret;
}
static inline long atomic_swap(atomic_t* a, long val)
{
//return __sync_lock_test_and_set(&a->val, val);
long reg = a->val;
a->val = val;
return reg;
}
static inline void atomic_set(atomic_t* a, long val)
{
a->val = val;
}
static inline long atomic_read(atomic_t* a)
{
return a->val;
}
static inline void spinlock_lock(spinlock_t* lock)
{
while(atomic_read(&lock->lock))
while(atomic_swap(&lock->lock,-1));
}
static inline void spinlock_unlock(spinlock_t* lock)
{
atomic_set(&lock->lock,0);
}
#endif
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