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fix: LockManager use OS-aware flock shim#17128

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fix: LockManager use OS-aware flock shim#17128
weihanglo wants to merge 2 commits into
rust-lang:masterfrom
weihanglo:lock

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What does this PR try to resolve?

Address the last missing part in -Zfine-grain-locking: #17110 (review)

Resolves #17084

How to test and review this PR?

r? ehuss

@rustbot rustbot added A-filesystem Area: issues with filesystems A-infrastructure Area: infrastructure around the cargo repo, ci, releases, etc. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 23, 2026
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A-filesystem Area: issues with filesystems A-infrastructure Area: infrastructure around the cargo repo, ci, releases, etc. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties.

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Successfully merging this pull request may close these issues.

Cargo will lose inter-process file locking on Solaris on with 1.98-nightly

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