Re: [boost] [python] threading-related failures on Linux

From: David Abrahams (dave_at_[hidden])
Date: 2006-03-22 14:23:56

Vladimir Prus <ghost_at_[hidden]> writes:

> David Abrahams wrote:
>
>> It made things work :)
>> 
>> IIRC, libpythonXX.a on *nix requires these libraries.  Why is this
>> mysterious?
>
> Why it requires -pthread only whem <define>BOOST_PYTHON_STATIC_LIB is in
> properties. 

I don't know, unfortunately.

>> There are two usual ways to use Python on *nix:
>> 
>> 1. extending, where the Python executable dynamically loads Python
>>    extension modules and they use the Python API that's statically
>>    linked into the Python executable.  In this model, the Python
>>    executable is linked to whatever libraries it needs, such as
>>    pthreads and dl.
>> 
>> 2. embedding, where a user-written executable uses the Python API in
>>    libpythonXX.a.  In that case, who is going to link to pthreads and
>>    dl if not the user-written executable.
>
> Then, how <define>BOOST_PYTHON_STATIC_LIB is related to those
> cases. 

It shouldn't be.

> It's quite feasible to embed python and use shared linking to
> Boost.Python at the same time.

Yes.

>>> 2. In V2, shared linking to Boost.Python is used, and the
>>> application is fully shared. So, where does the link error come
>>> from? Is comment even more inaccurate?
>> 
>> Than what?
>
> I mean, -pthread is required for all embedding, even if linking to
> Boost.Python is shared. Right?

I believe so.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com