[Bug libc/10320] erand48 implementation not thread safe but POSIX says it should be

["simon at josefsson dot org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=10320

--- Comment #6 from Simon Josefsson <simon at josefsson dot org> 2012-12-21 08:12:50 UTC ---
(In reply to comment #5)
> Can you clarify whether there is actually a bug here? POSIX says:
> 
>   The drand48(), lrand48(), and mrand48() functions need not be thread-safe.
> 
> If you're claiming erand48, jrand48, and/or nrand48 also have thread-safety
> problems, please clarify that and explain what the problem is.

The problem should be completely described if you read the first two posts in
this report.

To summarize the current state:

* drand48, lrand48, mrand48 need not be thread-safe.
* erand48, jrand48, lcong48, nrand48, seed48, and srand48 ought to be
thread-safe, as far as I understand.
* The erand48, jrand48, lcong48, nrand48, seed48, and srand48 functions appears
to be thread unsafe in glibc, since they use a global variable.

The links into git posted in the first post (3 years ago) still works, if you
want to read the code.

/Simon

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