WINE vs. FreeBSD

[Daniel Eischen]

On Mon, 24 Jul 2006, Tijl Coosemans wrote:

> On Monday 24 July 2006 17:39, Daniel Eischen wrote:
>> On Mon, 24 Jul 2006, Tijl Coosemans wrote:
>>> I've attached two patches that accomplish this, but this seems to
>>> trigger other problems, so use at your own risk. If you want to try
>>> them, place them in the port's files/ directory and add a line
>>> containing "USE_AUTOTOOLS= autoconf:259" to the Makefile. This
>>> seems to break wine+libpthread, so I've also changed the port to
>>> use libthr instead.
>>>
>>> For the libpthread experts, I haven't investigated that much
>>> further yet, but libpthread seems to fail in create_stack() from
>>> _pthread_create() from _thr_start_sig_daemon().
>>
>> See my response to this in a previous reply to this thread.  libthr
>> and libpthread use LDT's for TLS.  WINE is stomping on them because
>> it doesn't properly create LDTs.  This is not a problem with either
>> of the thread libraries and this issue has been known ever since we
>> implemented TLS years ago.
>
> And as I stated later on in that thread, I don't see where libpthread
> and libthr still use LDT entries. As far as I understand the code,
> instead of using an LDT entry per thread (as it sure used to be), only
> one single GDT entry is used whose base address is updated during a
> context switch. Looking at the cvs history, it has been working like
> this since a couple commits of Peter Wemm about a year ago.
>
> And if nothing but Wine uses the LDT, Wine's static allocation of LDT
> entries can't be the problem.

Look, we use %gs for TLS, period.  Go see libpthread/arch/i386/i386/pthread_md.c
for how libpthread does it.  TLS would not work without setting aside
a register for the threads library (and rtld) to use.

-- 
DE