Spin delay for a number of microseconds.
- macOS 10.0+
The integer number of microseconds to spin wait.
This function spins to delay for at least the number of specified microseconds. Since the CPU is busy spinning no time is made available to other processes; this method of delay should be used only for short periods. Also, the AbsoluteTime based APIs of kern/clock.h provide finer grained and lower cost delays.