[PATCH] __libc_alloca_cutoff (aka make mysql and others apps with very low RLIMIT_STACK setting happy)

[Ulrich Drepper]

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Roland McGrath wrote:

> Conversely instead of a variable we could have a function that's given the
> size and returns whether to use alloca or malloc.

The variable should definitely not be exported.  We should always only
use functions.


> The libc version can
> just say to always use alloca, I don't care about supporting tiny
> RLIMIT_STACK values for single-threaded programs.

Sure.  It always worked.



> The libpthread version
> can look at the thread's stack size vs the allocation, and perhaps even
> look at the current stack depth.

Yep.  We have the stack size in the thread descriptor anyway so in fact
we have the thread-local variable.


> Then we don't have to diddle setrlimit
> and all the rest, or add the word of TLS data

setrlimit is out anyway.  I'm not using it in nptl at all.


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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
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