Programming Psion Computers by Leigh Edwards PDF

By Leigh Edwards

ISBN-10: 0953066304

ISBN-13: 9780953066308

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Process IDs and process control block Each process is identified by its process ID - a positive 16-bit number containing two bit fields: The least significant 12 bits is the offset of the process control block in the operating system data segment (also called the process slot). The most significant 4 bits contains a value in the range 0-7 (note that a valid process ID is positive). This value is incremented modulo 8 each time a process slot is re-used so that an invalid process ID may be rejected if the process being referred to has already terminated.

The expiry of a higher priority process in the timer DELTA queue. g. after loading another process from an image) Raising the priority of another process. By lowering its’ own priority. If there is more than one ready process with the highest priority, then each process is made current for a fixed time period (4 system ticks), after which the operating system makes the next process of that priority current in what is called a ‘round robin’ fashion. On a SIBO machine, the system ‘ticks’ 32 times a second.

G. ). 1 or higher. It is not possible to develop OVAL applications directly on the Series 3c, Workabout or DOS based emulators. OVAL applications can be distributed, to suitably equipped users, by the usual methods. Macros Three options for Macro based automation / programming currently exist for SIBO systems (Non currently exist for the Series 5). MACSYS MACSYS is a Freeware Macro system that allows automation of most common Psion tasks. It can record and play back a sequence of keystrokes, but MACSYS macros are actually full OPL programs, and can use all the power available to the system.

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Programming Psion Computers by Leigh Edwards


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