Download Amiga Programmer's Handbook, Volume I by Eugene Mortimore PDF

By Eugene Mortimore

Booklet by way of Mortimore, Eugene

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Extra info for Amiga Programmer's Handbook, Volume I

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The next part of this new struc ture contains the data definition. If you study the definition of the parameters in these structures, you can begin to see how messages are passed between tasks in the system. These are some of the most impor tant points to remember: ■ The system can contain any number of tasks. Each task is defined by a Task struc ture. ) ■ Each task can deal with up to 32 signals assigned to it. Each signal is represented by a signal bit number. The signals that are allocated to a task are contained in the bits of the 32-bit tc_SigAlloc parameter of the Task structure; if a bit is set, that signal number is allocated.

Once the task uses (and perhaps changes) the data information in the message, it is ready to send a reply message back to the reply port specified in the Message struc ture. The mn_ReplyPort parameter in the Message structure tells the task where to send the reply message. This is done with ReplyMsg inside the task. When ReplyMsg returns, the message will be placed as the last message on the messageport message list of the reply port. 7. When the message arrives at the reply port, the task is immediately signaled of its arrival.

Then you can access it just like any other device. AddHead Qyntax of Function Call AddHead (list, node) AO A1 Purpose of Function This function adds a new Node structure to the head of a doubly-linked list. lB AMIGA 20H AMIGA PROGRAMMER'S HANDBOOK Inputs to Function list A pointer to the List structure that will contain this node node A pointer to the Node structure to insert at the head of the list iscussion Exec has a number of macros and functions designed to operate on nodes (Node struc tures) and doubly-linked lists (List structures) built from nodes.

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