Re: [Boost-users] pthread, futex_wait hang

From: Matt Paindavoine. (matt_at_[hidden])
Date: 2004-08-30 15:17:58

Thank you Peter! 
Bull's eye.
I had to link with xxx-mt-xxx versions of some boost libraries, make
sure that my Jamfiles had a <threading>multi, and it ran smoothly.
thanks again,

Matt.

On Mon, Aug 30, 2004 at 10:08:05PM +0300, Peter Dimov wrote:
> Matt Paindavoine. wrote:
> >Hello,
> >
> >I have been using the spirit parser library, and other boost pieces
> >(date, test, variant, ...), along with Mozilla.
> >I recently merged in some parts of the application that were running
> >separately, and the program started hanging.
> >I did a bit of searching, but couldn't find anything significantly wrong,
> >especially since the individual parts are working correctly.
> >The problem seems to be related to threads, as the stack indicates (cf
> >stack at the end), and as the strace output shows here:
> 
> [...]
> 
> >futex(0x4045b860, FUTEX_WAIT, 2, NULL)  = -1 EAGAIN (Resource
> >temporarily
> [...]
> 
> >#6  0x409c91fc in ~lightweight_mutex (this=0x819eb40) at
> >lwm_pthreads.hpp:53 #7  0x409c9d24 in ~sp_counted_base_impl
> >   (this=0x819eb40) at nsCXExpRecord.cpp:219
> >#8  0x409c96e2 in boost::detail::sp_counted_base::destruct
> >   (this=0x819eb40) at shared_count.hpp:115
> >#9  0x409b2a7e in boost::detail::sp_counted_base::weak_release
> >   (this=0x819eb40) at shared_count.hpp:173
> 
> This can happen if some parts of your multithreaded program were compiled 
> without multithreading support (or vice versa). The pthread_mutex_destroy 
> call in ~lightweight_mutex expects to find a pthread_mutex at &m_, but the 
> shared_ptr was created by unthreaded code, and an empty lightweight_mutex 
> got used. 
> 
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