[boost] [filesystem] Now uses POSIX readdir_r if available

From: Beman Dawes (bdawes_at_[hidden])
Date: 2005-01-21 09:38:49

CVS has been updated:

* For POSIX systems, directory_iterator now uses readdir_r if available, 
with a fallback to readdir otherwise. The POSIX readdir function uses a 
static buffer, so is unsafe in multi-threaded apps. Furthermore, there has 
been a report that readdir on Mac OS X does not meet the POSIX requirement 
of a different static buffer for each directory stream; readdir_r should 
solve that problem too.

* Tests have been added to operations_test.cpp to detect interference 
between directory_iterators.

The changes have been tested using operations_test.cpp on Red Hat Linux 8.0 
and Windows XP. Since gcc on this Linux does supply readdir_r, the code was 
tweaked by hand to force use of readdir. Both passed.

Please let me know right away if you run into any problems!

--Beman