Tcl Source Code

I briefly brough this up on tcl-core.  On Unix(like)
systems, way too much memory is being allocated for
per-thread structures.  Basically, some storage is
allocated for a filename returned from dirent(), but
the amount of space allocated is enough for a full
pathname, when only enough for a filename is required.
 In other words, "PATH_MAX" is used where "NAME_MAX" is
what was wanted.  The difference is about 3.75k/thread
on my Linux box, and might be worse on other systems.  

Furthermore, POSIX allows a system to not define
PATH_MAX if it doesn't have a pathname limit.  The Hurd
is such a system, so this code breaks on The Hurd
(which shouldn't be a major problem, since the code is
wrong to begin with).

I'm attaching the patch I wrote for Debian's Tcl8.4
package.  Comments, criticism and questions welcomed.

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Cool, that's much cleaner, thanks.  In the future, it might
be nice to add a configure test to see if *any* extra memory
is required (which it is on solaris, but isn't on
glibc-based systems like linux and hurd), but this is
definitely good enough for now.

File Added - 42928: namemax.patch

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I had to correct this with the attached patch to the patch 
which ensures that we have some value defined.  Solaris was 
otherwise choking (it has the BSD-style MAXNAMLEN).  
Patched in 8.4.2.

File Added - 42819: thread_memory_patch