id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4978,Deadlock on interrupt() all threads if they are in wait(),d.schneider@…,Anthony Williams,"After the change in changeset 66228 a deadlock can happen, if many threads are in waiting state and then all threads will be interrupted.
I just saw the problem on a 4-core 64-bit machine (gcc (Ubuntu 4.4.3-4ubuntu5) 4.4.3). On an older 2-core machine (gcc (GCC) 3.4.6 20060404 (Red Hat 3.4.6-11)) this newer occurred. It only happened with more than 5 threads, in average in every 2nd or 3th run.

In condition_variable::wait() the following two mutex get locked:
1. in interrupt_checker c-tor internal_mutex, there also thread_info::'''cond_mutex''' = internal_mutex get set
2. in this_thread::interrupt_point thread_info->'''data_mutex''' to protect thread_info::interrupt_requested

In thread::interrupt() the same two mutex get locked in reversed order:
1. local_thread_info->'''data_mutex'''
2. boost::pthread::pthread_mutex_scoped_lock internal_lock(local_thread_info->'''cond_mutex''');

I attached my test code.",Bugs,closed,To Be Determined,thread,Boost 1.46.0,Showstopper,fixed,,