Hi everyone, I started recently using Valgrind (Helgrind and DRD), and I mainly want to detect data races in my program composed of two processes that communicate via a POSIX shared memory object. I found quite a lot of examples showing how Valgrind can detect data races in multithreaded applications (where all threads belong to the same process). However, this is not the case I am interested in.
Basically, my program is composed of two processes, namely Server and Client. The Server is responsible of creating a named shared memory object with "shm_open", sets the size with "ftruncate" and maps the shared memory object to Server's virtual address space with "mmap". On the other hand, the Client opens/gets this shared memory object with "shm_open" and then maps it to Client's virtual address space with "mmap". Both Server and Client processes have Read & Write access to this shared memory object. There is a nice example in: https://www.softprayog.in/programming/interprocess-communication-using-posix-shared-memory-in-linux; the main difference between this example and my program is I am not using any semaphore (i.e., any kind of protection mechanism neither) at all. When running my program with Valgrind (v 3.7.0) in Linux, I am getting no warnings about potential data races in my program. In fact, when both Server and Client processes are running in parallel (i.e., each in a different processor core) and there is not a mechanism protecting the access to the shared memory object (e.g., a data structure), I expect somehow to see some data races warnings. So, I wonder whether I am missing something here or Valgrind just does not support data race detection in Inter-Process Communications (like the one I have in my program). Many thanks in advance for your helps! Best, Carlos H.
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