New PDF release: Amiga Programmer's Handbook, Volume I

By Eugene Mortimore

ISBN-10: 0895883678

ISBN-13: 9780895883674

Booklet through Mortimore, Eugene

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Additional info for Amiga Programmer's Handbook, Volume I

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In addition, signals are nothing more than bits in a longword (32-bit word). To bring these ideas into focus, it is worthwhile to first look at the MsgPort and Message structures, which play a big part in intertask communi cation. The definition of these structures is as follows: struct MsgPort { struct Node mp_Node; UBYTE mp_Flags; UBYTE mp_SigBit; struct Task *mp_SigTask; struct List mpJVIsgList; }; struct Message { struct Node mn_Node; struct MsgPort *mn_ReplyPort; UWORD mn_Length; The meaning of the parameters in the MsgPort structure is as follows: ■ The mp_Node parameter is the name of a Node substructure that is used to add this message port to a message-port list for this task.

In addition, each task can reply messages back to the reply ports of the other three tasks. As you can see, this leads to a lot of connections. SIGNAL TASK 1 / 1 1 ^\ \ \mp\ GetMsg \ \^ PutMsgj ReplyMsgi/l T^GetMsg \ mf iRP / SIGNAL ,' y ' / TASK 2 /mp 1 k GetMsg \T\ /T] SIGNAL ^Jg-h f \ i^Geds^- Multiple Tasks, V\ GetMsg TASK 3 J I N»P 1 / M> r Message Ports. 3: Trp / SA/^eplyMsg 9 ReplyMsgVj / ^^ SIGNAL T N/ID p GetMsg \MP V\ SIGNAL ^ / J -X+JL ^^ SIGNAL v f \ \ 1 \ PutMsg ^f\ReplyMsg ^ \ 1 TASK 4 / / / Messages, am Signals KEY Message port message queue MP RP Reply port message queue SIGNAL Signal to task on arrival of message in port Each message port signals its task when a message arrives in either its message-port queue (one signal bit number) or its reply-port queue (usually another signal bit number).

Resource file. The Keyboard device handles input from the keyboard and converts it into input events that your program can retrieve and interpret. Keyboard input events are queued, so that the user can continue to type without losing keystrokes. The Gameport device handles information from the mouse, joystick, or any potentio meter device. Like keyboard input, gameport events are queued. You can tell the system what type of device is connected and how often to check and report the current status of the device.

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Amiga Programmer's Handbook, Volume I by Eugene Mortimore

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