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Each device unit uses the same set of internal device routines, shared by all tasks that calion all units of the device. The Device structure is used to manage the library of device internal routines. In addition, the Unit structure is used to manage each unit of the device; it provides a definition of the device I/O request port for that device unit. DEVICE lID Each unit of each device also has a set of internal device buffers used to process the I/O requests coming from each task in the system.

The device-unit queue is managed by a set of two standard device commands (CMD_FLUSH and CMD_RESET) and one Exec function (AbortIO). Each device chapter discusses these commands and functions. Interactions with Multiple Ports and Units This section explains, with the aid of two diagrams, how multiple reply ports and multiple device units are handled in the Amiga system. 2 shows a task working with one unit of a device but using a number of reply ports to handle different types of data coming back from the device.

The unit_Flags flag parameters in the Vnit structure have the following meanings: • VNITF_ACTIVE. The device unit associated with this Unit structure is currently active accessing its internal routines to process an I/O request. • UNITF_INTASK. The device unit associated with this Unit structure is currently associated with a particular task. Therefore, if the unit is opened in exclusive access mode, another task will not be able to open it until the other task closes it. Both of these flag parameter bits are controlled by the system.

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