add atomic queue, no lock, unorder.

lichao

2021-04-30 d33a69463f1a75134d01191be0b9e1bdd757dd4b

 src/defs.h

@@ -37,6 +37,7 @@
class SharedMemory;
} // namespace bhome_shm

std::string BHomeShmName();
bhome_shm::SharedMemory &BHomeShm();
bool GlobalInit(bhome_shm::SharedMemory &shm);
typedef std::string Topic;