A structure describing a system capability change.
UIKit for Mac 13.0+Beta
A system capability change is a system level transition from a set of system capabilities to a new set of system capabilities. Power management sends a kIOMessageSystemCapabilityChange message and provides this structure as the message data (by reference) to gIOPriorityPowerStateInterest clients when system capability changes.
An identifier for this message notification. Clients with pending I/O can signal completion by calling allowPowerChange() with this value as the argument. Clients that are able to process the notification synchronously should ignore this field.
A return value to the caller indicating the maximum time in microseconds to wait for the allowPowerChange() call. The default value is zero, which indicates the client processing has finished, and power management should not wait for an allowPowerChange() call.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.