io_context.run() block indefinitely if child redirects it's output to pipe

[o01eg]

I have the code already using boost.process v1 to manage child processes:

https://github.com/freeorion/freeorion/blob/a72caab5816e7401247ed0ea2399efe47ad6702a/util/Process.cpp#L215-L220

If I add boost::process::async_pipe and redirects boost::process::std_out and boost::process::std_err here it freezes on io_context.run().

I've tried to use Boost.Process V2 but it doesn't help https://github.com/o01eg/freeorion/tree/boost-process-v2-capture

[klemens-morgenstern]

Well yes, io_context will process any IO/ i.e. block until both pipes are closed.