third_party/ulib/jemalloc/include/jemalloc/internal/spin_inlines.h

#ifndef JEMALLOC_INTERNAL_SPIN_INLINES_H
#define JEMALLOC_INTERNAL_SPIN_INLINES_H

#ifndef JEMALLOC_ENABLE_INLINE
void	spin_init(spin_t *spin);
void	spin_adaptive(spin_t *spin);
#endif

#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_SPIN_C_))
JEMALLOC_INLINE void
spin_init(spin_t *spin)
{
	spin->iteration = 0;
}

JEMALLOC_INLINE void
spin_adaptive(spin_t *spin)
{
	volatile uint64_t i;

	for (i = 0; i < (KQU(1) << spin->iteration); i++)
		CPU_SPINWAIT;

	if (spin->iteration < 63)
		spin->iteration++;
}

#endif

#endif /* JEMALLOC_INTERNAL_SPIN_INLINES_H */