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  1.  Home
  2. MI400
  3. October 2004

Porting libgc to the AS/400

If you plan to use it as part of a C program then maybe but you'll probably have to use all IBM ILE-C. It's pretty much a closed book on the /400(internals and ILE-C). I assume you mean a resident C program running as a user job on the /400 and not a PC/C program accessing the /400.

From what I can gather on the libgc page, it tries to do a better job of
re-allocating memory then malloc. There are way too many hurdles and most of the MI knowledge is generally about structures, use of the documented MI language and some processes. But creating another malloc that re-allocates memory on the /400 is better left to IBM. That's unfortunate but there's just no reliable published documentation that would help you. A great exercise but if your serious would end in frustration. The internals knowledge required is too great. You can already dynamically re-allocate memory in MI as well as C, so I'm not sure what benefit the another gc is other than maybe a better algorithm but it might not necessarily perform better on the /400.

For example, you would have to have internals knowledge of the ILE-C or C heap storage and re-allocation algorithms, storage structures, etc. to even begin determining if it's worth it. You'd have to hack every bit of that information. Easily a full-time 1-3 month effort solo. But that's just my opinion, you may find it worth the effort, but it would be all for your benefit, since no one in the /400 world would use/trust it anyway. Sorry!

Although, if you like a challenge, write another SQL engine for the /400(Oracle please help!).

:))

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