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It seems like #7408 will need some potentially intrusive work, so
let's add the low-level hook back so third party developments can work
well with `8.8.1/master` for the moment.
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We move the main async flags to the STM in preparation for
more state encapsulation.
There is still more work to do, in particular we should make some of
the defaults a parameter instead of a flag.
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We also remove some internal implementation details from the mli file,
there due historical reasons.
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Instead of modifying exceptions to wear additional information, we instead use
a dedicated type now. All exception-using functions were modified to support
this new type, in particular Future's fix_exn-s and the tactic monad.
To solve the problem of enriching exceptions at raise time and recover this
data in the try-with handler, we use a global datastructure recording the
given piece of data imperatively that we retrieve in the try-with handler.
We ensure that such instrumented try-with destroy the data so that there
may not be confusion with another exception. To further harden the correction
of this structure, we also check for pointer equality with the last raised
exception.
The global data structure is not thread-safe for now, which is incorrect as
the STM uses threads and enriched exceptions. Yet, we splitted the patch in
two parts, so that we do not introduce dependencies to the Thread library
immediatly. This will allow to revert only the second patch if ever we
switch to OCaml-coded lightweight threads.
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Experimenting with PIDE I discovered that yield is not sufficient
to have a rescheduling, hence the delay.
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Emilio Jesus Gallego Arias
Théo Zimmermann
Maxime Dénès
Pierre-Marie Pédrot
Enrico Tassi
Hugo Herbelin