Hi all,
I’m looking for a way to initiate a call from the RTS into Haskell (base
function) running and evaluating an IO function using the non-threaded RTS.
For the threaded RTS I can use rts_evalIO with the RTS capability, but for the
non-threaded I can’t find a way that doesn’t trigger the
if (cap->in_haskell) {
errorBelch("schedule: re-entered unsafely.\n"
" Perhaps a 'foreign import unsafe' should be 'safe'?");
stg_exit(EXIT_FAILURE);
}
Clause in the scheduler.
Taking a look at how the non-threaded I/O manager currently works on Windows,
it seems that re-uses the TSO from the blocked thread doing the I/O call to
give notifications back.
This approach doesn’t work for me since the new I/O manager doesn’t block doing
a foreign call boundary, instead It blocks in Haskell on an MVar, and I only
want to wake up very specific threads.
In short, does anyone know of a way to initialize an I/O operation from the
non-threaded RTS?
Thanks,
Tamar
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