Spin Operation

x86 platform: Use pause or rep;nop for spin operation.

define SPIN() __asm__ __volatile__("pause")
define SPIN() __asm__ __volatile__(" rep; nop \n");

AArch64: You can use nop to implement similar operations.

define __nops(n)       ".rept" n"\nnop\n.endr\n"
define SPIN(n)         asm volatile(__nops(n))

Parent topic: Common Atomic Operations (C Language)