On 21-07-2022 17:39, Ludovic Courtès wrote:
Alternatively:4. Do the waitpid in a separate thread (needs work-around for the multi-threaded fork problem, probably C things? Or modifying Guile and maybe glibc to avoid async-unsafe things or make more things async-safe or whatever the appropriate ...-safe is here.)For shepherd, multithreading is not an option due to the semantics of fork in the presence of threads.
From what I've read, multi-threaded fork is safe as long as you do an exec 'immediately' afterwards, without doing things like taking locks or allocating memory with malloc in-between the fork and exec. I don't think it's possible to do that in Guile code, but that's what the C things are for.
Greetings, Maxime.
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