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

By Eugene Mortimore

Ebook by means of Mortimore, Eugene

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Extra resources for Amiga Programmer's Handbook, Volume I

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That is, the designated task is always signaled on arrival of any message in that message-port queue. The important word here is arrival; a task is not sig naled when the message is removed from the message-port queue (when it is proc essed by GetMsg or Remove). If a message never reaches the top of its messageport queue, it can always still signal a task (if mp_SigTask is specified). The simplest possible case that illustrates these concepts is that of one task with one message port, one reply port, and two signals.

There are two types of interrupts on the Amiga: software and hardware. Usually, all hardware interrupts are preprocessed by the Exec routines prior to calling the interrupt routines. This is where the Amiga-specific interrupts are identified: seven levels of 68000 CPU interrupts are decoded into the 15 individual Amiga interrupt vectors. Because of the way things are arranged, multiple pieces of server code can share the same interrupt number. For example, several routines will execute when the verticalblanking interrupt (Amiga interrupt 5) occurs; this happens every 1/60 of a second.

The OpenDevice, RemDevice, RemLibrary, and WaitIO functions all work in this way. You can have your program test this error value and act accordingly. i 4| AMIGA PROGRAMMER'S HANDBOOK Finally, it is important to understand one other aspect of Exec function usage: some functions return structure pointer variable values. You can use these specific pointer vari able values later in your task programming. For example, the AllocEntry function returns the value of the MemList structure pointer variable; it also initializes a block of RAM where the MemList structure is stored.

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