[Boost-bugs] [Boost C++ Libraries] #2391: interprocess_recursive_mutex doesn't work interprocess

Subject: [Boost-bugs] [Boost C++ Libraries] #2391: interprocess_recursive_mutex doesn't work interprocess
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-10-07 20:29:39

#2391: interprocess_recursive_mutex doesn't work interprocess
----------------------------------------------------+-----------------------
 Reporter:  Sergey Samsonik <serge_98_at_[hidden]>  |       Owner:  igaztanaga  
     Type:  Bugs                                    |      Status:  new         
Milestone:  Boost 1.37.0                            |   Component:  interprocess
  Version:  Boost 1.35.0                            |    Severity:  Showstopper 
 Keywords:  interprocess fork pthread               |  
----------------------------------------------------+-----------------------
 The recursive mutex tests current thread using
 detail::get_current_thread_id(), which in turn uses pthread_self(). The
 latter function returns thread id that unique in context of a process. (As
 least in CentOS 4.6 'm using.) This results in threads from different
 processes not being synchronized. Sometimes it results in asserts (in
 debug build) or exceptions (in release).
 Attached is a small shared memory test that uses fork() which led me to
 finding the problem. Environment and test's output:

 $ g++ -v
 Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
 Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
 --infodir=/usr/share/info --enable-shared --enable-threads=posix
 --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-
 libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
 Thread model: posix
 gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)
 [sergeys_at_sergeys-vm32 boosttest]$ g++ bug.cc -o bug -I
 /mnt/builder/3rdParty/boost/v35.0/include -L
 /mnt/builder/3rdParty/boost/v35.0/lib32 -l rt

 $ uname -a
 Linux sergeys-vm32 2.6.9-78.0.1.ELsmp #1 SMP Tue Aug 5 11:02:47 EDT 2008
 i686 i686 i386 GNU/Linux

 $ g++ bug.cc -o bug -I /mnt/builder/3rdParty/boost/v35.0/include -L
 /mnt/builder/3rdParty/boost/v35.0/lib32 -l rt

 $ ./bug
 parent pthread_self -1208224064
 child pthread_self -1208224064
 bug:
 /mnt/builder/3rdParty/boost/v35.0/include/boost/interprocess/sync/emulation/interprocess_recursive_mutex.hpp:97:
 void boost::interprocess::interprocess_recursive_mutex::unlock():
 Assertion `detail::equal_thread_id(detail::get_current_thread_id(),
 m_nOwner)' failed.
 Aborted
 Done child

 Please note, that when built on different system (CentOS 5), the test runs
 without assertion. But the mutex still doesn't protext the code as
 intended.

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/2391>
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