Unverified50% confidenceFactExact time
OnceLock is a one-time initialization primitive in the Rust standard library (std::sync::OnceLock) that allows a value to be written only once during the process lifetime, after which all accesses are read-only and thread-safe; its cost is that the cache is unaware of runtime environment changes, such as needing to restart the process for a mid-run Python installation to take effect.
1
Sources
50%
Confidence
Long-term
Relevance
10/13/2026
First Seen
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