[Boost-bugs] [Boost C++ Libraries] #7923: Multiple consecutive named_mutex::remove

Subject: [Boost-bugs] [Boost C++ Libraries] #7923: Multiple consecutive named_mutex::remove
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-01-24 13:57:23

#7923: Multiple consecutive named_mutex::remove
-------------------------------------------+--------------------------------
 Reporter:  cbarrioy <cbarrioy@…>          |        Type:  Bugs              
   Status:  new                            |   Milestone:  To Be Determined  
Component:  None                           |     Version:  Boost 1.52.0      
 Severity:  Problem                        |    Keywords:  named_mutex remove
-------------------------------------------+--------------------------------
 I have three named_mutex that need to be removed from system in the same
 inizialization function to ensure the unique existence of the named
 resources.

 The problem appear with multiple consecutive calls to named_mutex::remove
 with the three named_mutex, obtaining "false" return value randomly.

 I can see that named_mutex::remove use a temporal file and rename it with
 a name generated randomly, using process/system info data, however I
 obtain the same generated name in two consecutive calls and consequently
 remove method fails

 Maybe a precision issue with time used to construct the randomly generated
 name.


 I make a simple program to reproduce the problem. With this example you
 can obtain "false" sometimes in the first iteration, sometimes at
 iteration 11000, 23000, 90000...

 {{{
 #include <boost/interprocess/sync/named_mutex.hpp>
 #include <boost/interprocess/exceptions.hpp>
 #include <boost/scoped_ptr.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/thread.hpp>

 using namespace std;

 void sharedMemoryTest()
 {
         boost::scoped_ptr<boost::interprocess::named_mutex>     mutex;
         boost::scoped_ptr<boost::interprocess::named_mutex>     mutex2;

         std::string mutexName = "ASYSTEM_00000_mutex";
         std::string mutexName2 = "ASYSTEM_00001_mutex";
         bool error = false;
         int count = 0;
         while(!error)
         {
                 try
                 {
                         mutex.reset(new
 boost::interprocess::named_mutex(boost::interprocess::create_only,
 mutexName.c_str()));
                         error = error ||
 !boost::interprocess::named_mutex::remove(mutexName.c_str());


                         mutex2.reset(new
 boost::interprocess::named_mutex(boost::interprocess::create_only,
 mutexName2.c_str()));
                         error = error ||
 !boost::interprocess::named_mutex::remove(mutexName2.c_str());


                         ++count;
                 }
                 catch(boost::interprocess::interprocess_exception& ie)
                 {
                         cout<<"Error "<<ie.what() <<" on iteration:
 "<<count<<std::endl;
                         error = true;
                 }
         }

         cout<<"Error on iteration: "<<count<<std::endl;
 }

 int _tmain(int argc, _TCHAR* argv[])
 {
         sharedMemoryTest();
         return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7923>
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