[Linux] boost::process:: child ::wait_until is not thread-safe

[AlexeyZaharov]

Hi! I faced with the problem that my process hangs up while it uses wait_until() of child::process. So I watched boost code and find that boost::process::child::wait_until is not thread-safe

1. struct signal_interceptor_t is used for setting custom reaction on signal with using system ::signal. So handler_func is a new handler and sigchld_handler is setting for previous handler
2. The problem is that signal handler - atribut of the process, not thread, so if the next thread call ::signal then sigchld_handler is setting for handler_func
3. Which thread will be used for handle signal is undefined. So thread with sigchld_handler == handler_func can be used! And this cause infinite loop
4. You can face with the problem in this code, which uses problem part of wait_until. (On my system signals are handled by main thread). Also attach out of the programm
   bug_wait_until.cpp.txt
   out.txt

So can you update your documentation with this note please?

[AlexeyZaharov]

Close this issue and open in right place