SystemMessageQueue

All Known Implementing Classes:

CallingThreadMailbox, Mailbox
```
public interface SystemMessageQueue
```
Enqueue a new system message, e.g. by prepending atomically as new head of a single-linked list.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`hasSystemMessages()`
`EarliestFirstSystemMessageList`	`systemDrain(LatestFirstSystemMessageList newContents)`	Dequeue all messages from system queue and return them as single-linked list.
`void`	`systemEnqueue(ActorRef receiver, SystemMessage message)`

Method Detail

hasSystemMessages
```
boolean hasSystemMessages()
```

systemDrain
```
EarliestFirstSystemMessageList systemDrain(LatestFirstSystemMessageList newContents)
```
Dequeue all messages from system queue and return them as single-linked list.

Parameters:

newContents - (undocumented)

Returns:

(undocumented)

systemEnqueue

void systemEnqueue(ActorRef receiver,
                   SystemMessage message)