Ludovic Courtès schreef op wo 23-03-2022 om 23:36 [+0100]:
> Fibers is used in a single-threaded fashion, which is the main
> constraint for shepherd since it forks.  That also means that fibers
> cannot be preempted, so it’s fully cooperative scheduling.

When hz!=0, guile-fibers uses with-interrupts/thread-cputime which uses
threads.  However, when (provided? 'threads) is false, it uses
'with-interrupts/sigprof', which uses signal handlers and SIGPROF
instead.  So with some small tweaks to guile-fibers, it should be
feasible to have singly-threaded, preemptive scheduling.

Greetings,
Maxime.