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Dec 23rd, 2006

turbo c processor fault

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when I exit a function i get 'general protection exception' -' processor fault'. Function writes to file and works ok except won't exit. What does this mean please, and where should I look ? Am using Turbo C 4.5 & Windows xp. Must be overwriting memory somehow I suppose but can't see where. Have increased stack size in .def file- no use.
All suggestions welcome !!

danijohn

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Dec 23rd, 2006

Re: turbo c processor fault

Could you post the code you're having trouble with? Most likely you're trying to acess memory you shouldn't be, such as using a pointer that isn't pointing to what you expect it to, but it's kind of hard to guess unless you actually show us what you're trying to do.

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Dec 23rd, 2006

Re: turbo c processor fault

Click to Expand / Collapse Quote originally posted by danijohn ...

when I exit a function i get 'general protection exception' -' processor fault'. Function writes to file and works ok except won't exit. What does this mean please, and where should I look ? Am using Turbo C 4.5 & Windows xp. Must be overwriting memory somehow I suppose but can't see where. Have increased stack size in .def file- no use.
All suggestions welcome !!

I think it's waste of time solving your problem for Turbo C. Better get a new compiler Check this link
http://www.daniweb.com/techtalkforums/thread50370.html

SpS

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Dec 24th, 2006

Re: turbo c processor fault

His problem is almost certainly not caused by using TC 4.5 (which though old is still somewhat servicable and can produce 32 bit Windows code) but by a bug in his code.

jwenting

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Dec 28th, 2006

Re: turbo c processor fault

Thanks for encouraging me to look for coding bug.
You are right. Eventually I traced it to repeated calls to a library routine, fcvt, which converts floats to strings. I didn't expect a problem here because I've used it elsewhere, but not with repeated calls. It seems I have to store the ouput in a static variable. Hence the return addresses getting screwed up, and the bizarre error messages.

danijohn

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Dec 28th, 2006

Re: turbo c processor fault

Yes you are right. It turned out to be repeated calls to a library routine, fcvt, that converts floats to strings. The small print which I missed says the ouput must be stored in a static variable. I hadn't, which accounts for the return addresses getting screwed up and the bizarre error messages.

danijohn

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Dec 28th, 2006

Re: turbo c processor fault

Thanks for reply. You are probably right that I'm missing some goodies staying with an old compiler, but I don't want the cost of a new one, or learning a new environment.
In spite of the bizarre error messages, it turned out to be a simple coding error.

danijohn

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Dec 28th, 2006

Re: turbo c processor fault

Click to Expand / Collapse Quote originally posted by danijohn ...

Thanks for reply. You are probably right that I'm missing some goodies staying with an old compiler, but I don't want the cost of a new one, or learning a new environment.
In spite of the bizarre error messages, it turned out to be a simple coding error.

cost is no excuse -- some such as Dev-C++ are free.

>> or learning a new environment
If you want to do this as a hobby that's ok. But no company uses that compiler any more.

Last edited by Ancient Dragon; Dec 28th, 2006 at 5:51 pm.

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Dec 29th, 2006

Re: turbo c processor fault

and no company uses Dev-C either.

jwenting

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Dec 29th, 2006

Re: turbo c processor fault

Depends on what exactly do you mean by a company -- a big time software gaint or a small time budding organization with no more than 10 people.

If the former, then yes, you are correct. But if the latter, then no, I have seen small time companies (like those in embedded development etc.) using free IDE's like Code::Blocks and Dev C++.

~s.o.s~

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