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modules/vm: Fix sequence sharing condition for already retired evals.

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This commit is contained in:
Jason Volk 2019-03-28 16:22:19 -07:00
parent 8e23a49ced
commit 83593c5533
1 changed files with 14 additions and 9 deletions
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15
modules/vm.cc
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@ -815,19 +815,24 @@ ircd::m::vm::write_prepare(eval &eval,
assert(eval.opts);
const auto &opts{*eval.opts};
// Share a transaction with any other evals on this stack. This
// Share a transaction with any other unretired evals on this stack. This
// should mean the bottom-most/lowest-sequence eval on this ctx.
const auto get_other_txn{[&eval]
(auto &other)
{
if(&other != &eval && other.txn)
{
if(&other == &eval)
return true;
if(!other.txn)
return true;
if(sequence::get(other) <= sequence::retired)
return true;
other.sequence_shared[1] = std::max(other.sequence_shared[1], sequence::get(eval));
eval.sequence_shared[0] = sequence::get(other);
eval.txn = other.txn;
return false;
}
else return true;
}};
// If we broke from the iteration then this eval is sharing a transaction