Assert after reloading multiple times a .so linked with the static build of Boost.Thread

[sorin.fetche@…]

The attached test program shows that after a few hundred reloads of a shared library linked with the static build of Boost.Thread, an assert will be raised (gcc 4.4; boost 1.46.1).

As a note, the test program demonstrates the usage of a shared library that exposes a C interface and is implemented using statically linked Boost libraries.

Test program output:

./a.out Call: 0 Call: 100 Call: 200 Call: 300 Call: 400 Call: 500 a.out: /home/sfetche/local/boost/src/boost_1_46_1/boost/thread/pthread/condition_variable_fwd.hpp:46: boost::condition_variable::~condition_variable(): Assertion `!pthread_mutex_destroy(&internal_mutex)' failed. Aborted

[Sorin Fetche <sorin.fetche@…>]

In case it helps, the problem can be avoided, at least in boost 1.51, by compiling Boost.Thread with BOOST_THREAD_PATCH defined. That's because a fix for the issue is in the code already but is not enabled by default.

If it doesn't cause any side effects, could this fix be enabled by default?

[viboes]

The patch was suggested for #3926, but as discussed on this ticket the patch is not enough.