#ifndef JEMALLOC_INTERNAL_SPIN_H

#define JEMALLOC_INTERNAL_SPIN_H

#define SPIN_INITIALIZER {0U}

typedef struct {

	unsigned iteration;

} spin_t;

static inline void

spin_cpu_spinwait() {

#  if HAVE_CPU_SPINWAIT

	CPU_SPINWAIT;

#  else

	volatile int x = 0;

	x = x;

#  endif

}

static inline void

spin_adaptive(spin_t *spin) {

	volatile uint32_t i;

	if (spin->iteration < 5) {

		for (i = 0; i < (1U << spin->iteration); i++) {

			spin_cpu_spinwait();

		}

		spin->iteration++;

	} else {

#ifdef _WIN32

		SwitchToThread();

#else

		sched_yield();

#endif

	}

}

#undef SPIN_INLINE

#endif /* JEMALLOC_INTERNAL_SPIN_H */