change shm socket msg queue to atomic queue.

lichao

2021-04-30 95bd9a67f9f6c90f627784e3f8fbf5c203784e51

 src/robust.cpp

@@ -26,7 +26,7 @@
{
static_assert(sizeof(steady_clock::duration) == sizeof(int64_t));
static_assert(sizeof(RobustReqRep) == 24);
static_assert(sizeof(CasMutex<false>) == 8);
static_assert(sizeof(Mutex) == 8);
static_assert(sizeof(CircularBuffer<int>) == 48);

auto Now() { return steady_clock::now().time_since_epoch(); }