Re: [Boost-bugs] [Boost C++ Libraries] #8884: boost asio in posix_event: lock release before condition signaled

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8884: boost asio in posix_event: lock release before condition signaled
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-06-30 14:34:51

#8884: boost asio in posix_event: lock release before condition signaled
-------------------------------+-------------------------------
  Reporter:  carsten.becker@…  |      Owner:  chris_kohlhoff
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  asio
   Version:  Boost 1.54.0      |   Severity:  Problem
Resolution:                    |   Keywords:  race multi-thread
-------------------------------+-------------------------------

Comment (by Bjorn Reese <breese@…>):

 POSIX states that (emphasis added)

  "The pthread_cond_broadcast() or pthread_cond_signal() functions may be
 called by a thread whether or not it currently owns the mutex that threads
 calling pthread_cond_wait() or pthread_cond_timedwait() have associated
 with the condition variable during their waits; however, '''if predictable
 scheduling behavior is required, then that mutex shall be locked by the
 thread calling pthread_cond_broadcast() or pthread_cond_signal()'''."
 [http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_signal.html]

 So I recommend that the patch from Carsten is applied.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8884#comment:1>
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