Proposal: API for thread-safe time zone functions

[Garrett Wollman]

<<On Thu, 7 Jun 2001 13:44:48 -0700 (PDT), Paul Eggert <eggert at twinsun.com> said:

> It doesn't worry about threads, so it mishandles this case: two
> different threads can clobber the same internal structure.

> I don't offhand know what other systems do.

At least in FreeBSD, these functions are serialized for thread
safety.  (That's one of the reasons we haven't updated to a recent
tzcode in years.)  Obviously, functions like localtime() which return
static buffers can never be made thread-safe.

-GAWollman