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uClibc attempts to fully (and rigorously) support "The Open Group Base
Specifications Issue 6 IEEE Std 1003.1, 2003 Edition" (aka SuSv3). However, as
with any standard, they sometimes require things that are either impossible or
are Completely Stupid(tm). Therefore, we cannot claim full compliance, and
there may be some area of uClibc that differ from the requirements of this
specification. This document attempts to list these differences and, when
completed, will contain a full list of all relevant differences between uClibc
and the requirements of the SuSv3.
1) The uClibc setlocale() function is not threadsafe.
SuSv3 states that "The locale state is common to all threads
within a process.". But it does not explicitly mention
setlocale() as a function that need not be thread-safe.
Making setlocale() threadsafe would require an absurd amount
of locking (i.e. inside each and every ctype call such as
isalpha()). Furthermore, we consider calling setlocale()
from N threads concurrently while using string functions to
be a terribly dumb thing to do. Therefore, we have decided
that setlocale() shall not be threadsafe. If you are
multi-threaded, and you wish to change the global locale
state, please take care to prevent all other threads from
using any locale or ctype functions until the setlocale()
call has finished.
2) Some functions required by SuSv3 are not currently implemented.
Functions listed by SuSv3 but not (yet) included in uClibc:
fmtmsg <not implemented>
getgrgid_r <not implemented>
getgrnam_r <not implemented>
More to follow when we think of it...
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