Re: [boost] Boost thread problem with fork() on 2.6 Linux (Ubuntu 7.10) boost 1.34.1

From: Sami Väisänen (sami.vaisanen_at_[hidden])
Date: 2008-06-09 09:02:56

Frank Mori Hess wrote:
> On Monday 09 June 2008 06:32 am, Anthony Williams wrote:
> >> Sami Väisänen <sami.vaisanen_at_[hidden]> writes:
> >>> I have an application that forks a child process. The child exists
> only
> >>> for a little while, (does dup2() calls to redirect stdout/stderr
> output
> >>> into pipes and then makes a system() call) and then exits with exit().
> >>> However at exit I get an assertion failure in boost.thread library
> (the
> >>> assertion happens in the child process)
> >>>
> >>>
> >>>
> ../boost_1_34_1/libs/thread/src/condition.cpp:351:boost::detail::conditio
> >>> n_impl::~condition_impl(): Assertion `res == 0'
> >> That error indicates that the underlying condition variable couldn't
> >> be destroyed properly. Are you sure that your OS correctly clones
> >> condition variables when you do a fork?
>
> pthreads (at least the version I have) requires mutexes to be
> re-initialized
> in the child process after a fork, as mentioned in the pthread_atfork man
> page.
mmh, sounds like this would require me to track the mutexes in the
parent process in order to be able to re-initialize them in the child
process. I guess I must look for alternative ways for solving this
problem. (ways that do not involve forking)

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