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Full Discussion: Use of alloca function
Top Forums Programming Use of alloca function Post 302366816 by shamrock on Friday 30th of October 2009 11:25:40 AM
Old 10-30-2009
Quote:
Originally Posted by Corona688
Code:
int main(void)
{
        void *buffer=alloca(512);
        while(fread(stdin, 512, buffer) != NULL)
        { /* do stuff */ }
}

I already get there are ways you can't use it. That doesn't mean its useless. Nobody's forcing you to use it either.
All I m trying to say is that the value from alloca cant be returned from the function that called it. I most likely wont be using it since I have to deal with multiple platforms.
Quote:
Originally Posted by Corona688
Many implementations of malloc aren't threadsafe. But we're beginning to repeat ourselves here.
Care to list some platforms where the malloc implementation isnt threadsafe...just curious btw.
Quote:
Originally Posted by Corona688
It's a stretch to call something that exists on any UNIX you can name, and beyond into the non-UNIX world, nonportable. But don't forget I'm trying to prove you right here. You're assuming it's problematic, I'm hunting for better reasons instead of assuming you're wrong.
Not concerned about the right or wrong aspect of it. I probably am totally wrong...but as we deal with multiple platforms I am leary of something that's billed non-portable and strongly discouraged i.e. "dont want to rush in like a fool where vendors fear to tread"
Quote:
Originally Posted by Corona688
In that respect I've found two items of interest; a makefile that suggests some historical System V's didn't have it, and an SCO compiler bug that happens under extremely specific circumstances. The latter is very interesting, I'll have to modify my tests to include it.

I never said it was in the standard or documentation -- I'd be shocked if it was. I didn't just make it up, though -- some sources think v32 has it.
Not a big deal again I was just curious why my copy didnt have it but as fpmurphy clarified it was an assembly routine.
 

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