Mail Archives: cygwin/2009/11/20/13:21:22
On 11/20/09, Corinna Vinschen wrote:
> On Nov 20 09:32, Christopher Faylor wrote:
>> On Fri, Nov 20, 2009 at 12:20:52PM +0100, Corinna Vinschen wrote:
>> >On Nov 20 06:04, mike marchywka wrote:
>> >> On 11/19/09, Larry Hall (Cygwin) <reply-to-list-only-lh AT cygwin DOT com>
>> >> wrote:
>> >>>Wow! I had a hunch that BLODA could be the cause of the file related
>> >>>problems but it never occurred to me that it could be screwing up
>> >>>environment variables too.
>> >>
>> >>Anyone care to determine if env updates are not thread safe?
>> >
>> >It's indeed not thread safe. Looks like we need some locking...
>>
>> What's "it" in this case? putenv?
>
> "it" is primarily _addenv, which is used by setenv and putenv.
>
>> The putenv() function is not required to be reentrant, and the one in
>> libc4, libc5 and glibc 2.0 is not, but the glibc 2.1 version is
>
> Same for setenv and unsetenv, which don't need to be thread-safe per
> POSIX. glibc's setenv is thread-safe, though.
>
>> I agree that it would be nice to make it safer but is there really code
>> here which is updating the environment in separate threads?
>
> And given POSIX, if so, it would be an application bug if the application
> doesn't care by itself to use setenv/getenv in a thread-safe manner.
>
Why does the OS let this happen? I thought windoze should
avoid garbage. In my case, IIRC, they were 2 unrelated installs having
nothing to do with cygwin- is this unrelated to the OP's problem?
Maybe they both
used installshield or something but otherwise were independent. It isn't
just a clean conflict, like one update dropped updates from other
process, but IIRC I had
garbage in at least one variable.
>
> Corinna
>
> --
> Corinna Vinschen Please, send mails regarding Cygwin to
> Cygwin Project Co-Leader cygwin AT cygwin DOT com
> Red Hat
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