Re: [Boost-bugs] [Boost C++ Libraries] #3526: Data races in boost::thread detected by drd/helgrind

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3526: Data races in boost::thread detected by drd/helgrind
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-06-05 10:40:34

#3526: Data races in boost::thread detected by drd/helgrind
-------------------------------------+--------------------------------------
 Reporter:  m.strashun@…             |       Owner:  anthonyw
     Type:  Bugs                     |      Status:  new     
Milestone:  To Be Determined         |   Component:  thread  
  Version:  Boost Development Trunk  |    Severity:  Problem 
 Keywords:  valgrind,drd,threading   |  
-------------------------------------+--------------------------------------
Changes (by bvanassche@…):

 * cc: bvanassche@… (added)
  * version:  Boost 1.40.0 => Boost Development Trunk
  * severity:  Regression => Problem

Comment:

 This is a real bug. With the current implementation it is possible that
 call_once() invokes its second argument (Function f) twice. flag.epoch
 should be tested again after detail::once_epoch_mutex has been locked,
 just like as when applying the double-checked optimization to the
 singleton pattern.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3526#comment:6>
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