[RFC] speed up walk of working dir by 20-25%

[Vadim Gelfer]

On 6/13/06, Matt Mackall <mpm at selenic.com> wrote:

> Not an unreasonable thing to do. But is this portable to anything but Linux?

comes from bsd, portable to linux and macos.

i have rewritten listdir extension in pure c. will use dirent.d_type
if available, else lstat.

here are performances of "hg --time add" on kernel repo:

pure python: 2.25 seconds
lstat in c: 1.83 seconds (19% faster)
d_type in c: 1.63 seconds (37% faster)

and "hg --time status":

pure python: 1.91 seconds
lstat in c: 1.49 seconds (32% faster)
d_type in c: 1.57 seconds (18% faster)

i have attached more portable c code.
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