Re: [Boost-bugs] [Boost C++ Libraries] #3448: interprocess_condition (emulated) can exit with inconsistent m_num_waiters value

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3448: interprocess_condition (emulated) can exit with inconsistent m_num_waiters value
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-10-13 01:29:38

#3448: interprocess_condition (emulated) can exit with inconsistent m_num_waiters
value
--------------------------------------------------------------+-------------
 Reporter:  Zachariah L Young <zachariah.l.young@…>           |       Owner:  igaztanaga  
     Type:  Bugs                                              |      Status:  new         
Milestone:  Boost 1.41.0                                      |   Component:  interprocess
  Version:  Boost 1.40.0                                      |    Severity:  Problem     
 Keywords:  interprocess_condition                            |  
--------------------------------------------------------------+-------------
Changes (by anonymous):

  * version:  Boost 1.39.0 => Boost 1.40.0

Comment:

 Confirmed to still exist in Boost 1.40.
 My test case: 5 threads timed_send'ing ~1024 byte messages into a
 message_queue with que_size == 1 and msg_size == 1024. Each thread is
 setup to send every 100 ms, with a 100 ms timeout.

 Windows XP, 4 core processor, ~4Gb RAM

 The threads all lock within 60 seconds of startup.

 Based on the description above, I added this at line 174 of
 boost/interprocess/sync/emulation/interprocess_condition.hpp:
 {{{
 detail::atomic_dec32(const_cast<boost::uint32_t*>(&m_num_waiters));
 }}}

 It solved the problem.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3448#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.