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The default action is to raise NotReady, but one may want to
make the action "blocking" but successful. Using this device
all delayed proofs can be "delegated". If there are slaves, they
will eventually pick up the task. If there are no slaves, then
the future can behave like a regular, non delegated, lazy computation.
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If a Future.computation is already a value v or an exception and
is chained in a greedy way with a function f, then f v is executed
immediately (or the exception is raised).
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This optimization was undone because the kernel type checking was
not a pure functions (it was accessing the conv_oracle state imperatively).
Now that the conv_oracle state is part of env, the optimization can be
restored. This was the cause of the increase in memory consumption, since
it was forcing to keep a copy of the system state for every proof, even the
ones that are not delayed/delegated to slaves.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16963 85f007b7-540e-0410-9357-904b9bb8a0f7
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A future always carries a fix_exn with it: a function that enriches
an exception with the state in which the error occurs and also a safe
state close to it where one could backtrack.
A future can be in two states: Ongoing or Finished.
The latter state is obtained by Future.join and after that the future
can be safely marshalled.
An Ongoing future can be marshalled, but its value is lost. This makes
it possible to send the environment to a slave process without
pre-processing it to drop all unfinished proofs (they are dropped
automatically in some sense).
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16892 85f007b7-540e-0410-9357-904b9bb8a0f7
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A computation that is an exception morally holds no value
hence can be replaced by an type-equivalent computation.
This mechanism is used to edit broken proofs.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16808 85f007b7-540e-0410-9357-904b9bb8a0f7
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The Stm commit switched from an home made handling of failures to
a with_state_protection. This was wrong, since in case of success
the global state has to be left altered.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16746 85f007b7-540e-0410-9357-904b9bb8a0f7
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Processing the proof in a slave process may fail for an implementation
error, e.g. the state could not be marshalled, or an anomaly is raised
by the slave.
In this case we fall back to local, lazy, evaluation in the master
process.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16743 85f007b7-540e-0410-9357-904b9bb8a0f7
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Since the whole system is imperative, futures are run protecting
the global state, and the final state is also saved to let the user
freely chain futures.
Futures can represent local (lazy) computations or remote ones
(delegated). Delegating a future lets a third party assign its
value at some poit in the future; in the meanwhile accessing the
future value raises an exception.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16669 85f007b7-540e-0410-9357-904b9bb8a0f7
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Enrico Tassi
gareuselesinge