Thread safety of deserialized objects

[JohnEmhoff]

Is it expected that a message deserialized from a pipe in thread 1 can be passed and safely read from thread 2? I'm running into an issue where attempting to inspect such an object hangs when accessed from thread 2. It only seems to happen when the object is ~64k or greater.

My workaround for now is to instead call .to_dict() on the message and pass that around instead, which works but is obviously not great.

If this is surprising behavior I can put together a reproduction.

[haata]

It's been a while since I look at this, but pycapnp uses the capnproto library and I believe that it's not necessarily thread safe (it's been a long time since I've look at this). There may be some sort of GIL involved too.

[JohnEmhoff]

Interesting -- is there some way to clone the object or am I stuck with to_dict?

[haata]

I'm not sure, this is more a question for https://github.com/capnproto/capnproto/