## Physical Device Driver Reference

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### POWER_SETPOWEREVENTRES (41h) - SemHandle

SemHandle A semaphore handle created for Power Management Event Notifications. This function supports the use of 16-bit system semaphores or 32-bit event semaphores. When a semaphore is added to the resource set, the appropriate bits must be specified in the ReqFlags field to define the semaphore type. This field value is not required if the caller's request is not involved in setup or removal of a semaphore resource.

Note:

If using a 16-bit semaphore, you must use a 16-bit system semaphore. RAM semaphores are not supported.

If using a 32-bit event semaphore, the resource must be created with the Shared attribute so the Power Management subsystem can access it at any time.