By Eugene Mortimore
Booklet by way of Mortimore, Eugene
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Additional resources for Amiga Programmer's Handbook, Volume I
The task gets the top (first) message in the message-port queue using GetMsg. Notice that, in general, this is not the same message placed in the message-port queue by the most recent PutMsg call. Rather, it is the message that has worked its way to the top of the queue (now the first message in the list). Other messages in that queue are moved up in the message list. 4. GetMsg tells the task that a message is now available. A pointer to the Message structure for that message is returned by GetMsg.
Once in memory it is initialized to some fixed parameter settings; your program can modify these settings as desired. The parallel device is most often used with the parallel printer driver. The printer device supports various printers attached to the Amiga. You can add more device drivers for different printers as you need them. Just like the serial and paral lel device drivers, the printer device driver is loaded from disk when needed—whenever a user issues a print command. You can add any number of devices, including any devices that you want to hook into either the serial port, the parallel port, the printer port, or the expansion connector port.
THE EXEC FUNCTIONS noNS ■ ■17 1 Using Devices Consider the flow of your program as you use devices in the system. If you think about the flow of code in this multitasking system, you will begin to appreciate how Exec handles devices. Assume you have three tasks in the system. Each task wants to use a specific device, whose characteristics are known to your program and which can help sat isfy some of the data needs of that program. You have developed device-specific routines to handle the input/output of this device, coding and debugging them separately, and now you want to include them in the system.
Amiga Programmer's Handbook, Volume I by Eugene Mortimore