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removing the need of thread creation in the interface.
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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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Generalize the old model by letting one park a worker and
by letting the (parked) worker be picky about the tasks it
picks up.
The use of that is the following: a proof worker, while performing
its "main" task (building a proof term) computes all the intermediate
states but returns only its main result. One can ask the worker
to hang around, and react to special tasks, like printing the
goals of an intermediate state.
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This is mainly shuffling code around and removing internal
refs that are not needed anymore.
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stm test-suite files.
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par: distributes the goals among a number of workers given
by -async-proofs-tac-j (defaults to 2).
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