If they need to wait in atomic context, they probably do. e.g. for linux: https://www.kernel.org/doc/Documentation/timers/timers-howto.txt https://www.kernel.o

If they need to wait in atomic context, they probably do. e.g. for linux: https://www.kernel.org/doc/Documentation/timers/timers-howto.txt https://www.kernel.org/doc/Documentation/timers/timers-howto... ATOMIC CONTEXT: You must use the delay family of functions. These functions use the jiffie estimation of clock speed and will busy wait for enough loop cycles to achieve the desired delay