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Q: How can my application get notified when the computer is going to sleep or waking from sleep? How to I prevent sleep?
A: Cocoa (Listing 1) and I/O Kit (Listing 3, Listing 4) can both be used to receive sleep and wake notifications. Cocoa can be used to receive sleep and wake notifications, while I/O Kit can also prevent or delay (Listing 2, Listing 3) idle sleep. However, even with I/O Kit, it is not possible to prevent forced sleep, only delay it.
Note: Mac OS X will sleep in two different situations- forced and idle.
Forced sleep occurs when the user takes some sort of direct action to cause the machine to sleep. Closing the lid on a laptop or selecting sleep from the Apple menu both cause forced sleep. The system will also induce forced sleep under certain conditions, for example, a thermal emergency or a low battery.
Idle sleep occurs when the machine is unused for a specific period of time configured in the Energy Saver System Preferences.
Listing 1 Installing a Cocoa sleep and wake notification.
Note:IOPMAssertionCreateWithName is new API available in Mac OS X 10.6 Snow Leopard. IOPMAssertionCreateWithName allows an application to return a return a brief string to the user explaining why that application is preventing sleep. If you need to support previous versions of Mac OS X you will need to use the notification based APIs (Listing 3, Listing 4) or the deprecated call IOPMAssertionCreate.
Listing 2 Preventing sleep using I/O Kit in Mac OS X 10.6 Snow Leopard
Listing 3 Installing an I/O Kit sleep/wake notification.
To stop receiving I/O Kit sleep notifications, you need to remove your event source from the application runloop and do a bit of cleanup.
Listing 4 Removing I/O Kit sleep/wake notification handler.
Document Revision History
Vine And Void Mac Os X
| Date | Notes |
|---|---|
| 2014-01-13 | Corrected small bug in message logged in receiveWakeNote |
| 2011-03-01 | Updated code to use IOPMAssertionCreateWithName. |
| 2008-08-08 | Added information about forced/idle sleep, how to receive sleep/wake notification in Cocoa, and expanded IOKit sample to include wake messages and IOPMAssert. |
| 2005-10-17 | Added an example of how to deregister for sleep notifications. |
| 2004-10-25 | New document that explains how applications can register and unregister for sleep and wake notifications on Mac OS X. |
Copyright © 2014 Apple Inc. All Rights Reserved. Terms of Use Privacy Policy Updated: 2014-01-13
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