libNew.so and TCanvas

[pcanal]

@DanielCussol

have just seen in the (old) documentation that this could be a possibility to share TObjects for different threads or different ROOT simultaneous sessions.

It should not be used for sharing with threads. It is explicitly intended to use “shared memory” to pass information from one process to another.

So far on Ubuntu 20.04.4 and a debug build of the tip of the main branch, your example works for me.
However, it was failing before I upgraded in a Release build of an older version of ROOT (on Ubuntu 18). I will check if it works in a Release build with Ubuntu 20.04.4 and the tip of the main branch.