OSStatus DelayForHardware (AbsoluteTime absoluteTime);
DelayForHardware spins execution for a given time, so the computer does no useful work. Parameter absoluteTime is the amount of time to delay in processor-dependent units. You can call NanosecondsToAbsolute to obtain timing for the processor in your system. DelayFor Hardware may be called at any execution level.
DelayForHardware may be called from task level, secondary interrupt level, or hardware interrupt level.