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

By Eugene Mortimore

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Extra info for Amiga Programmer's Handbook, Volume I

Sample text

Structure parameters that are system constants are often written in all uppercase nota tion. This is how they appear in the structure definitions and function arguments. XXIX XXX I Examples of this are the MEMF_CHIP and MEMF_CLEAR parameters, which refer to different types of RAM blocks in the Exec Library AllocMem functions. Third, all ROM kernel function names begin with a capital letter and are otherwise lowercased, except for one or more case changes to indicate that they are compound words.

The io_Flags variable usually specifies some flags used only by the system. One of these is the IOF_QUICK flag bit, which indicates that QUICKIO is to be used for an I/O operation. However, under certain circumstances, this variable can contain information useful to the calling task. The io_Error variable specifies a potential error condition. The expected device action did not occur as designed. Perhaps a disk wasn't in a disk drive, the information in a memory buffer did not make sense, or the wrong area of memory was referenced in the call.

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. The message is queued in the reply port, the reply-port message list is updated and the task is signaled. Signal bit number 17 is used for this purpose. I AMIGA PROGRAMMER'S HANDBOOK 8. The task can now reference the reply message. It can access, use, and change the data in it. Once it does these things, the task is ready to send the message again using the same extended Message structure with new data defined.

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