[boost] Re: Windows MSVC thread exit handler for staticly linked Boost.Thread

From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-08-02 22:07:38

Roland wrote:

> On Sun, 01 Aug 2004 16:41:18 -0500 "Aaron W. LaFramboise" <aaronrabiddog51_at_[hidden]> wrote:
> 
> 
>>Just as a FYI, I now have a copy of MSVC6, and am working on this.
>>
>>MSVC6 does, in fact, have the necessary support, but there is a bug (I
>>had noticed this before, and this was one of the reasons I wasn't able
>>to offer more information a few months ago, and I had entirely forgotten
>>about it.  Oops.).  Fortunately, the bug is in the runtime library, not
>>in the linker or anything else.
> 
> 
> Yes the bug is, that the TLS handlers must be in a contiguous area
> between the __xl_a and __xl_z symbols. I fixed this by running a small
> piece of code during the startup (in __xi_a .. __xi_z area).
> 
> Finally I wrapped everything up into a small C file that either can be bound
> to boost or be linked with the user application. Despite now having everything
> in a single file, I think boost still should not give  away the possibility of
> letting the user code call the process/thread startup/termination hooks 
> directly. There always might be some code that needs this.

I'm not planning to remove them.

> Thanks to Aaron now now have a TLS solution that can handle any thread
> creation mechansim, while still reside in a statically bound library.
> 
> The tsstls.c file follows: To test it compile your application with BOOST_THREAD_USE_LIB

[code snipped]

I must be missing something. I added the code you posted into 
Boost.Threads static library and built it--no problem. But then when I 
link with that library, I get:

boost_cvs6sd.lib(threadmon.obj) : error LNK2001: unresolved external 
symbol "struct _IMAGE_TLS_DIRECTORY32 _tls_used" 
(?_tls_used@@3U_IMAGE_TLS_DIRECTORY32@@A)
boost_cvs6sd.lib(threadmon.obj) : error LNK2001: unresolved external 
symbol "void (__stdcall** __xl_z)(struct HINSTANCE__ *,unsigned 
long,void *)" (?__xl_z@@3PAP6GXPAUHINSTANCE__@@KPAX_at_ZA)
boost_cvs6sd.lib(threadmon.obj) : error LNK2001: unresolved external 
symbol "void (__stdcall** __xl_a)(struct HINSTANCE__ *,unsigned 
long,void *)" (?__xl_a@@3PAP6GXPAUHINSTANCE__@@KPAX_at_ZA)
Debug6/boost_test.exe : fatal error LNK1120: 3 unresolved externals

In the code you posted, the missing symbols are all defined as extern; 
what do I need to do to get their actually definitions linked in?

Mike