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PinnedVersions

uni_store::storage::adjacency_manager

Struct PinnedVersions 

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pub struct PinnedVersions { /* private fields */ }
Expand description

Versions currently pinned by in-flight snapshot readers.

Exists so shadow-CSR entries can be reclaimed without dropping any a live reader still resolves. The bound is subtle and worth stating once:

  • StorageManager::pinned() and at_fork each build a fresh AdjacencyManager with its own empty ShadowCsr, so those readers never consult the live instance.
  • StorageManager::pinned_at_version shares the live manager, and is the path every read-write transaction takes.

So the only readers of the live shadow are in-flight pinned_at_version views, and the safe floor is the minimum version among them. SnapshotManager cannot supply this — it is a manifest reader-writer and tracks no live readers.

Refcounted rather than a set: several transactions routinely pin the same version, and the floor must not rise until the last of them is gone.

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impl PinnedVersions

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pub fn pin(self: &Arc<Self>, version: u64) -> PinGuard

Register version as pinned until the returned guard drops.

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pub fn min_pinned(&self) -> Option<u64>

The lowest version any in-flight reader is pinned at.

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pub fn distinct_pinned(&self) -> usize

Number of distinct pinned versions; for tests and diagnostics.

Trait Implementations§

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impl Debug for PinnedVersions

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for PinnedVersions

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fn default() -> PinnedVersions

Returns the “default value” for a type. Read more

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