osfmk/man/P_set_policy_disable.html
Function - Disables a scheduling policy for a processor set.
**#include< mach/mach\_host.h>**** kern\_return\_t processor\_set\_policy\_disable****(processor\_set\_t**processor\_set, **int** policy, **boolean\_t** change\_threads**);**
processor_set[in processor-set-control port] The control port for the processor set for which a scheduling policy is to be disabled. policy[in scalar] Policy to be disabled. The values currently defined are POLICY_TIMESHARE and POLICY_FIXEDPRI. change_threads[in scalar] If true, causes the scheduling policy for all threads currently running with policy to POLICY_TIMESHARE.
The processor_set_policy_disable function restricts the set of scheduling policies allowed for processor_set. The set of scheduling policies allowed for a processor set is the set of policies allowed to be set for threads assigned to that processor set. The current set of permitted policies can be obtained from processor_set_info. Timesharing may not be forbidden for any processor set. This is a compromise to reduce the complexity of the assign operation; any thread whose policy is forbidden by its target processor set has its policy reset to timesharing. Disabling a scheduling policy for a processor set has no effect on threads currently assigned to that processor set unless change_threads is TRUE, in which case their policies will be reset to timesharing.
Only generic errors apply.
Functions: processor_set_policy_enable, processor_set_info, thread_policy.