Re: [Boost-bugs] [Boost C++ Libraries] #11317: boost unique_lock has no mutex

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11317: boost unique_lock has no mutex
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-05-20 15:31:08

#11317: boost unique_lock has no mutex
------------------------------+--------------------------------------------
  Reporter:  shyamps@…        |      Owner:  viboes
      Type:  Support          |     Status:  assigned
  Requests                    |  Component:  thread
 Milestone:  To Be            |   Severity:  Problem
  Determined                  |   Keywords:  boost unique_lock has no mutex
   Version:  Boost 1.58.0     |
Resolution:                   |
------------------------------+--------------------------------------------

Comment (by shyamps@…):

 Replying to [comment:1 viboes]:
 > I would need more context, but I suspect that you are moving a
 unique_lock and then you are locking it.
 >
 > How optimization change the behavior of your application is out of my
 understanding.

 vibeos,

 Heres a sample code snippet that can be used to reproduce this issue on
 msvc 12.0:

 #include <boost/thread.hpp>

 class MyClass
 {
   boost::mutex myboostmutex;

   public:

   void Function1();
   void Function2();
 }

 void MyClass::Function1()
 {
   boost::mutex::scoped_lock SomeVariable (myboostmutex);

   //Application code
 }

 void MyClass::Function2()
 {
   boost::mutex::scoped_lock SomeVariable (myboostmutex);

   //Application code
 }

 To reproduce this bug, you need to follow these steps:

 1) Compile code with one of the flags /Og, /O1, /O2 or /Ox Flags (TURNED
 ON) in msvc 12.0 compiler.
 2) Create an instance of MyClass;
 3) First invoke Function1(), it should execute without any issue.
 4) Next execute Function2().

 When the code attempts to execute the boost::mutex::scoped_lock
 SomeVariable(myboostmutex) line in Function2() You can see a runtime
 exception "boost unique_lock has no mutex". The same erroneous behaviour
 doesn't occur when you turn off all the above mentioned compiler
 optimization flags.

 I would recommend trying to compile boost 1_58 library on an older version
 msvc 10.0 or msvc 11.0 compiler. That can help isolate the problem to
 determine if this is related to the compiler version.

 Thanks,
 Shyam

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11317#comment:3>
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