Wasmtime GitHub notifications bot (Feb 20 2024 at 22:04): Wasmtime GitHub notifications bot (Feb 20 2024 at 22:04):fitzgen opened PR #7969 from fitzgen:no-lock-to-clone-drop-registered-type to bytecodealliance:main:
By moving the registration count into the
Arc, that is pulling theArcoutwards from containing just theWasmFuncTypeto the registration count as well, and turning it into an atomic, we can manipulate the registration count without a write lock. Once that is done, we have the following:
RegisteredType::rootonly needs a read lock, not a write lock.
RegisteredType::clone, which used to need a write lock, doesn't need any locking anymore.
RegisteredType::dropdoesn't need any locking most of the time. The exception is when this is this drop that moves the refcount to zero, in which case grabbing a write lock is still necessary to remove the type from the registry.<!--
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Wasmtime GitHub notifications bot (Feb 20 2024 at 22:04):fitzgen requested alexcrichton for a review on PR #7969.
Wasmtime GitHub notifications bot (Feb 20 2024 at 22:04):fitzgen requested wasmtime-core-reviewers for a review on PR #7969.
Wasmtime GitHub notifications bot (Feb 20 2024 at 23:19):fitzgen updated PR #7969.
Wasmtime GitHub notifications bot (Feb 21 2024 at 00:04):alexcrichton submitted PR review.
Wasmtime GitHub notifications bot (Feb 21 2024 at 00:33):alexcrichton merged PR #7969.
Last updated: Dec 06 2025 at 06:05 UTC