Class JobQueue

A Muq jobQueue is just what you probably think, an anchor-point for a linklist of Job objects, typically used to hold a set of jobs waiting on some event before they continue. Jobs currently ready to run are kept in a jobQueue, as are paused jobs. Each stream object has two job-queues associated with it, one for jobs which are waiting for something to read, one for jobs waiting for room for a write.

Class JobQueue adds the following properties to those of Class Plain:

$S.next:     Next job in queue, or else the jobQueue itself.
$S.previous: Previous job in queue, or else the jobQueue itself.
$S.partOf:  In job-queues on a stream, this points to the stream.
$S.kind:     "i/o" usually, "run" for run queues, else "ps"/"doz"/"poz"/"hlt".

Note: For convenience, the $S properties are also available in the public (default) propdir.

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