Date: Thu, 15 Sep 2011 11:01:30 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: "Thinker K.F. Li" <thinker@codemud.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Thread-local storage issue Message-ID: <20110915080130.GL17489@deviant.kiev.zoral.com.ua> In-Reply-To: <20110915.105047.104045404.thinker@eeebox.branda.to> References: <20110915.105047.104045404.thinker@eeebox.branda.to>
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On Thu, Sep 15, 2011 at 10:50:47AM +0800, Thinker K.F. Li wrote:
> Hi Guys,
>
> I was in trouble for an issue of TLS implementation of FreeBSD. It is
> an issue of ld-elf.so actually. If I have a thread-local variable in
> program, the value of the variable is not consistent after an
> dlopen(). For example,
>
> __thread int var = 50;
>
> void modify() {
> var = 100;
> }
>
> void show() {
> printf("%d\n", var);
> }
>
> int main(int argc, char * const *argv) {
> dlopen(...);
> modify();
> show();
> }
>
> If it is compiled with -fpic, it would print "50" while "100" is
> expected. (-fpic is required for shared objects)
>
> I have send-pr a patch as
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=160721
>
> I need someone to review it.
I already sent the request to re@ to commit the change.
Thanks for the submission.
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