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Extra info for Amiga Programmers Handbook Volum II volume 2nd
Each device unit could be replying to one or more task reply ports. This is a useful configuration if, for example, you are working with all four units of the TrackDisk device and you want to place data from each disk drive in different task reply ports and associated data buffers. Queue Behavior This section explains, with the use of two diagrams, how task reply-port queues and device lIO request queues are used in the Amiga system. 4 illustrates how a task reply port behaves as one or more devices send their request replies (IORequest and IOStdReq structures) to it.
1: Task-Device Interaction Using liD Request Structures I~~~~ete L __ 1 ~~ 1 Lost RE'quest I ". 5 ! I i I ISignal I~/e~i~~qU esl Ihas arrived l 0 1st Request I I,Message De"ce tl Port I ~~ " --- Flush Reset AbortiO all affect I/O I/O or Asynchronous I/O device ;::::~ j ---------------the IOExtSer structure, and the Parallel device uses the IOExtPar structure, both of which have an IOStdReq substructure as their first entry. 1 shows one task, represented by the large rectangle on the left, and one device unit, represented by the large rectangle on the right.
ChecklO .. WaitlO .. WoitPort Wait QuicklO (CheckIO) DEVICE INTERNAL QuicklO (possible) ROUTII~ES (define device internat buffers) 'NO Sigl'lCl - BeginIO ... ", 0010'" SendlO .. 1: Task-Device Interaction Using liD Request Structures I~~~~ete L __ 1 ~~ 1 Lost RE'quest I ". 5 ! I i I ISignal I~/e~i~~qU esl Ihas arrived l 0 1st Request I I,Message De"ce tl Port I ~~ " --- Flush Reset AbortiO all affect I/O I/O or Asynchronous I/O device ;::::~ j ---------------the IOExtSer structure, and the Parallel device uses the IOExtPar structure, both of which have an IOStdReq substructure as their first entry.