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# CFNotificationSuspensionBehavior

Suspension flags that indicate how distributed notifications should be handled when the receiving application is in the background.

```
enum CFNotificationSuspensionBehavior
```

## Overview

An application selects the suspension behavior for a given notification when it registers an observer for that notification with [`CFNotificationCenterAddObserver(_:_:_:_:_:_:)`](/documentation/CoreFoundation/CFNotificationCenterAddObserver(_:_:_:_:_:_:)).

## Topics

### Constants

[`CFNotificationSuspensionBehavior.drop`](/documentation/CoreFoundation/CFNotificationSuspensionBehavior/drop)

The server will not queue any notifications of the specified name and object while the receiving application is in the background.

[`CFNotificationSuspensionBehavior.coalesce`](/documentation/CoreFoundation/CFNotificationSuspensionBehavior/coalesce)

The server will only queue the last notification of the specified name and object; earlier notifications are dropped.

[`CFNotificationSuspensionBehavior.hold`](/documentation/CoreFoundation/CFNotificationSuspensionBehavior/hold)

The server will hold all matching notifications until the queue has been filled (queue size determined by the server) at which point the server may flush queued notifications.

[`CFNotificationSuspensionBehavior.deliverImmediately`](/documentation/CoreFoundation/CFNotificationSuspensionBehavior/deliverImmediately)

The server will deliver notifications of the specified name and object whether or not the application is in the background. When a notification with this suspension behavior is matched, it has the effect of first flushing any queued notifications.


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