change shm socket msg queue to atomic queue.

lichao

2021-04-30 95bd9a67f9f6c90f627784e3f8fbf5c203784e51

 src/shm.cpp

@@ -25,6 +25,7 @@
    mshm_t(open_or_create, name.c_str(), size, 0, AllowAll()),
    name_(name)
{
   pmutex_ = FindOrCreate<Mutex>("ShmSelfControlMutex0");
}

SharedMemory::~SharedMemory()