Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!eternal-september.org!feeder.eternal-september.org!mx04.eternal-september.org!.POSTED!not-for-mail From: James Kuyper Newsgroups: comp.lang.c,comp.lang.c++,comp.unix.programmer,comp.lang.javascript,comp.lang.lisp Subject: Re: avcall, callback, trampoline, vacall, etc Date: Thu, 25 Oct 2012 16:04:10 -0400 Organization: A noiseless patient Spider Lines: 34 Message-ID: <50899B3A.6090403@verizon.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Injection-Info: mx04.eternal-september.org; posting-host="d8fef572ea43a1acd556896aa70d63af"; logging-data="26279"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/BFbx01ssgj2pDGrX+HcOlecKjpcj6jUQ=" User-Agent: Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 In-Reply-To: Cancel-Lock: sha1:GLHrySJLEN5iK4f/DlgXnuhj5yg= Xref: csiph.com comp.lang.c:27687 comp.lang.c++:19236 comp.unix.programmer:3649 comp.lang.javascript:16868 comp.lang.lisp:11742 On 10/25/2012 03:24 PM, gnuist007@hotmail.com wrote: > Dear Programming Gurus, > > These concepts are rather well talked about .. over the internet and > usenet, however, I cant find any clear explanation. > > avcall, callback, trampoline, vacall, etc > > I looked in a book of C programming, ie k&r and also the rationale for > C, an old copy and could not find any explanation. > > I know that javascript books talk a lot about callbacks and there is > the style of programming involving writing callbacks and registering > them. Unfortunately, in the age when I took my C class, there was no > discussion along these lines. > > Can anyone give clear definition, example, benefits, variations, > origin or citation to a paper where it originated and explained first, > as well as some modern text that does the better than most job of > illustrating it and its applications. When a C function takes as an argument a pointer to another function, the function pointed at is often referred to as a callback function. Examples from the C standard library include qsort() and bsearch(), where the callback function is called in order to determine the relative order of the records processed by those functions. I know nothing about vacall or avcall. I've heard of trampolines in the context of computer programming, but know little about them. For all questions like this, I would recommend starting with wikipedia - it generally does a good job of explaining computer-oriented technical terms like these; if you don't find it there, try google.