> But ring buffer requirement says “lock free” which only make sense inside a single process. No, "lock free" is a thing that's nice to have when you've got tw

> But ring buffer requirement says “lock free” which only make sense inside a single process. No, "lock free" is a thing that's nice to have when you've got two threads accessing the same memory. It doesn't matter if those two threads are in the same process or it's two different processes accessing the same memory. It's almost certainly two different processes in this case, and the shared memory is probably memory mapped file. Whatever it is, the shared memory approach is going to be much faster using the kernel to ship the data between the two processes. Via the kernel means two copies, and probably two syscalls as well.