atomic.h

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#ifndef __ATOMIC_H__
#define __ATOMIC_H__
 
static INLINE uint64_t
atomic_swap_uint32(volatile uint32_t *dst, uint32_t newval)
{
    asm volatile("lock; xchgl %0, %1;"
            : "+m" (*dst), "+r" (newval));
 
    return newval;
}
 
static INLINE uint64_t
atomic_swap_uint64(volatile uint64_t *dst, uint64_t newval)
{
    asm volatile("lock; xchgq %0, %1;"
            : "+m" (*dst), "+r" (newval));
 
    return newval;
}
 
static inline void
atomic_set_uint64(volatile uint64_t *dst, uint64_t newval)
{
    *dst = newval;
}
 
#endif /* __ATOMIC_H__ */