osfmk/man/processor_exit.html
Function - Exit a processor.
**kern\_return\_t processor\_exit**** (processor\_t **processor** );**
processor[in processor send right] The processor to be controlled.
The processor_exit function allows privileged software to exit a processor in a multi-processor that so allows it. An exited processor is removed from the processor set to which it was assigned and ceases to be active. The interpretation of this operation is machine dependent.
This operation is machine dependent. It may do nothing.
The ability to restart an exited processor is machine dependent.
KERN_FAILURE The operation was not performed. A likely reason is that it is not supported on this processor.
Functions: processor_control, processor_start, processor_info, host_processors.