Re: [Boost-bugs] [Boost C++ Libraries] #3628: condition.notify_one() does not wake up a thread that is in condition.wait() or condition.timed_wait()

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3628: condition.notify_one() does not wake up a thread that is in condition.wait() or condition.timed_wait()
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-11-26 14:36:50

#3628: condition.notify_one() does not wake up a thread that is in
condition.wait() or condition.timed_wait()
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 Reporter:  Shouaib Ahmed <ranashoaib@…>          |       Owner:  anthonyw
     Type:  Bugs                                  |      Status:  new     
Milestone:  Boost 1.41.0                          |   Component:  thread  
  Version:  Boost 1.40.0                          |    Severity:  Problem 
 Keywords:  condition                             |  
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Comment(by Shouaib Ahmed <ranashoaib@…>):

 Replying to [comment:2 viboes]:
 > Replying to [ticket:3628 Shouaib Ahmed <ranashoaib@…>]:
 > > You can see in the attached project's TestBoostThread.cpp file that in
 ThreadFuncWaiter(), the thread is in timed_wait() call before it releases
 the mutex to let the ThreadFuncNotifier() thread notify it. But inside
 notify_one(), most of the time it will choose not to notify any "waiter".
 The total_count class member is 0 when that happens. If I uncomment the
 three lines marked as WORKAROUND_ in TestBoostThread.cpp, then the threads
 will be notified, but this is just a workaround.
 >
 > Have you tried to protect with a mutex the theConditions variable? This
 variable is used by ThreadFuncNotifier() and  ThreadFuncWaiter().

 It is protected by a mutex. May be you overlooked that.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3628#comment:3>
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