Re: [Boost-bugs] [Boost C++ Libraries] #4524: interprocess::interprocess_semaphore consumes cpu while waiting

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4524: interprocess::interprocess_semaphore consumes cpu while waiting
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-08-25 16:36:01

#4524: interprocess::interprocess_semaphore consumes cpu while waiting
----------------------------------------------+-----------------------------
  Reporter:  Gennady Proskurin <gpr@…>        |       Owner:  igaztanaga  
      Type:  Bugs                             |      Status:  reopened    
 Milestone:  Boost 1.45.0                     |   Component:  interprocess
   Version:  Boost 1.47.0                     |    Severity:  Problem     
Resolution:                                   |    Keywords:              
----------------------------------------------+-----------------------------
Changes (by Gennady Proskurin <gpr@…>):

  * version:  Boost 1.46.1 => Boost 1.47.0

Comment:

 At quick glance seems that freebsd does not define
 _POSIX_THREAD_PROCESS_SHARED, but defines _POSIX_SEMAPHORES, so
 BOOST_INTERPROCESS_POSIX_PROCESS_SHARED is not defined and
 BOOST_INTERPROCESS_POSIX_NAMED_SEMAPHORES is defined. At file
 interprocess_semaphore.hpp there is a check for both
 BOOST_INTERPROCESS_POSIX_PROCESS_SHARED and
 BOOST_INTERPROCESS_POSIX_NAMED_SEMAPHORES.[[BR]][[BR]]
 I'm not sure why BOOST_INTERPROCESS_POSIX_PROCESS_SHARED is checked for
 semaphores. After reading posix docs I think it is for interprocess
 mutexes and condvars, semaphores are process-shared by definition. Patch
 for boost 1.47 attached, it fixes bug for me (on freebsd).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4524#comment:9>
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