Remove unnecessary release from Arc::try_unwrap #74025
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The thread that recovers the unique access to Arc inner value (e.g., drop when ref-count strong reaches zero, successful try_unwrap), ensures that other operations on Arc inner value happened before by synchronizing with release operations performed when decrementing the reference counter. When try_unwrap succeeds, the current thread recovers the unique access to Arc inner value, so release is unnecessary.
rust-highfive
added
the
S-waiting-on-review
|
This is correct, @bors r+ |
|
📌 Commit 8900502 has been approved by |
bors
added
S-waiting-on-bors
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Jul 5, 2020
…arth Rollup of 12 pull requests Successful merges: - rust-lang#72688 (added .collect() into String from Box<str>) - rust-lang#73787 (Add unstable docs for rustc_attrs) - rust-lang#73834 (Some refactoring around intrinsic type checking) - rust-lang#73871 (Fix try_print_visible_def_path for Rust 2018) - rust-lang#73937 (Explain exhaustive matching on {usize,isize} maximum values) - rust-lang#73973 (Use `Span`s to identify unreachable subpatterns in or-patterns) - rust-lang#74000 (add `lazy_normalization_consts` feature gate) - rust-lang#74025 (Remove unnecessary release from Arc::try_unwrap) - rust-lang#74027 (Convert more `DefId`s to `LocalDefId`s) - rust-lang#74055 (Fix spacing in Iterator fold doc) - rust-lang#74057 (expected_found `&T` -> `T`) - rust-lang#74064 (variant_count: avoid incorrect dummy implementation) Failed merges: r? @ghost
I assume you mean unnecessary?
There is no acquire in |
Yes, that was a typo.
It's in the |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The thread that recovers the unique access to Arc inner value (e.g., drop
when ref-count strong reaches zero, successful try_unwrap), ensures that
other operations on Arc inner value happened before by synchronizing
with release operations performed when decrementing the reference counter.
When try_unwrap succeeds, the current thread recovers the unique access
to Arc inner value, so release is unnecessary.
r? @Amanieu