Assert that explicit transaction snapshot never overwrites an older one #1494
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Explicit transaction snapshots are maintained by std::shared_ptr objects. When the last shared pointer is destructed, the shared snapshot is released. Add asserts that these snapshots are not held too long by checking that, whenever a new explicit snapshot is assigned to a transaction, that it does not overwrite an older existing one. To be able to cover all the places and to clean up the code, make the m_explicit_snapshot field protected instead of public, and add a few new methods instead. At the same time convert pointer to reference arguments, add [[nodiscard]], shorten Rdb_explicit_snapshot::explicit_snapshot_mutex critical sections.
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Explicit transaction snapshots are maintained by std::shared_ptr objects. When
the last shared pointer is destructed, the shared snapshot is released. Add
asserts that these snapshots are not held too long by checking that, whenever a
new explicit snapshot is assigned to a transaction, that it does not overwrite
an older existing one.
To be able to cover all the places and to clean up the code, make the
m_explicit_snapshot field protected instead of public, and add a few new methods
instead.
At the same time convert pointer to reference arguments, add [[nodiscard]],
shorten Rdb_explicit_snapshot::explicit_snapshot_mutex critical sections.