https://gunkies.org/index.php?action=history&feed=atom&title=Threaded_code 2026-05-13T02:34:10Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=Threaded_code&diff=35662&oldid=prev 2024-12-17T00:06:53Z

<p>Not as crisp and clear as it could be, but not bad</p> <p><b>New page</b></p><div>'''Threaded code''' is an intermediate approach to the [[execute|execution]] of [[program]]s on a computer - somewhere in between [[compiler|compiled]] and [[interpreter|interpreted]] code, but closer to the latter. The original program is converted to a [[binary]] form - but not the low-level [[object code]] that the computer's [[Central Processing Unit|CPU]] can interpret directly in [[hardware]]. Instead, each pseudo-'[[instruction]]' is a somewhat higher-level operation, which the threaded-code control/interpretation code has to implement (thus creating, effectively, a [[virtual machine]] with a more powerful [[instruction set]]). <br /> <br /> That software maintains a pseudo-[[Program Counter|program counter]] (perhaps in another CPU [[register]]), which points to the current pseudo-instruction being 'executed'. In many threaded code systems, the pseudo-instructions are simply the [[address]] of the [[subroutine|routines]] which implements the pseudo-instructions; when one routine is done, it simply [[jump]]s to the next routine (hence the name of this approach), the address of which is in the [[word]] pointed to by the pseudo-program counter. (Each implementation routine has to increment the pseudo-program counter, of course.)<br /> <br /> A threaded code system thus is faster than interpreted code, but its binary is more compact than object code to perform the same computation on that machine would be.<br /> <br /> ==External links==<br /> <br /> * Ronald F. Brender, [http://gordonbell.azurewebsites.net/Computer_Engineering/00000387.htm Turning Cousins into Sisters: An Example of Software Smoothing of Hardware Differences], in C. Gordon Bell, J. Craig Mudge, John. E. McNamara, ''Computer Engineering: A DEC View of Hardware Systems Design'', Digital Press, Bedford, 1978 - a good example of threaded code in use<br /> <br /> [[Category: Software Basics]]</div>

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