From: locke AT mcs DOT net (Peter Johnson)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Dynamic loading of functions
Date: Fri, 14 Feb 1997 23:20:28 GMT
Organization: BiLogic
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References: <Pine DOT VUL DOT 3 DOT 91 DOT 970214094133 DOT 8488I-100000 AT zeus DOT adv-boeblingen DOT de> <5e23ma$p39 AT rs18 DOT hrz DOT th-darmstadt DOT de>
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On 14 Feb 1997 16:25:46 GMT, Alexander Lehmann
<lehmann AT mathematik DOT th-darmstadt DOT de> wrote:

>Lennart Steinke <steinke AT zeus DOT adv-boeblingen DOT de> wrote:
>: Hi!
>
>: I'm currently playing with the idea of loading function dynamically
>: (for plug ins). It's working, but I've some questions:
>
>: 1) Do I have to lock the memory of the funtion after loading or
>:    not?
>: 2) Are there already libs for djgpp which allow dynamic binding?
>
>There is a rather simple dynamic loader in the for of .dxe files
>(mainly used for the FPU-emulator) that allows loading a program piece
>that doesn't have any external references (libraries etc) and just a
>single entry point. It takes care of relocating the code to the new
>location and all. Since it doesn't handle references, it would be
>necessary to return a struct that contains function pointers to all
>available functions and variables (and probably pass one for functions
>in the main program), which would make porting a library to dxe a bit
>difficult (could be done with cpp directives, though).
>
>Maybe it would be better to write a full-fleged dll or so-like library
>support, but this would be much more complicated, of course (but would
>be a very welcome addition to djgpp, I think).
One already exists... DLMs.
http://spy.isp.nsc.ru/djgpp/dlm.htm

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Peter Johnson
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locke AT mcs DOT net
http://locke.home.ml.org
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Freelance C/C++/Pascal/Asm programmer
 for DJGPP, Borland, and Watcom compilers
Member of BiLogic demo group
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