openMP code with C++ class knowledge member no longer working

OpenMP Code with C++ Class Records Individuals is No longer Working – Right here is What to Originate

Parallelization of applications can progressively lift huge efficiency features. OpenMP is an aesthetic design to make basically the most of such efficiency advantages in C++ applications. Alternatively, when trying to parallelize code that depends on a C++ class’s knowledge participants, that you just must well well web that your program’s efficiency is rarely any longer what you have been staring at for.

What’s Going On Right here?

At the center of the rep 22 situation lies the principle that of thread security. In a peculiar characteristic name, the class’s knowledge is stored in a web that the running machine understands. Alternatively, in OpenMP code, if extra than one threads are gaining access to the same knowledge, each and every thread basically wants to invent its have reproduction of the tips so as no longer to interfere with each and every somewhat just a few.

Fix It

Fortunately, there are a variety of how to resolve this rep 22 situation and web your OpenMP code working as that you just must well well demand:

  • Construct the Variables Thread-Local. By the exhaust of the OpenMP keyword threadprivate in C++ and passing the tips as arguments when calling the thread functions, it’s miles feasible to make sure that that each and every thread will get its have reproduction of the tips.
  • Write Atomicity Functions. If the tips participants that can well well maybe quiet be accessed by the threads are straightforward, atomic variables, a programmer can invent straightforward functions that develop the most simple operations below the most simple safeguarding.
  • Employ Locks. By making exhaust of semaphores, mutexes, or somewhat just a few locking mechanisms, a programmer could make sure that that only one thread is gaining access to the tips at any given time.


There are so much of solutions to the rep 22 situation of trying to parallelize code that depends on knowledge participants of a C++ class with OpenMP. By making the variables thread-local, writing atomicity functions, or the exhaust of locks, a programmer could make sure that that the OpenMP code is working accurately and getting the efficiency features they have been shopping for.