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Bumps codeberg.org/gruf/go-mutexes from 1.5.1 to 1.5.2. --- updated-dependencies: - dependency-name: codeberg.org/gruf/go-mutexes dependency-version: 1.5.2 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>pull/3978/head
dependabot[bot]
11 months ago
committed by
GitHub
5 changed files with 47 additions and 30 deletions
@ -0,0 +1,41 @@
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//go:build go1.22 && !go1.25
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package mutexes |
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import ( |
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"sync" |
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"sync/atomic" |
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"unsafe" |
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) |
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// syncCond_last_ticket is an unsafe function that returns
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// the ticket of the last awoken / notified goroutine by a
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// a sync.Cond{}. it relies on expected memory layout.
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func syncCond_last_ticket(c *sync.Cond) uint32 { |
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// NOTE: must remain in
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// sync with runtime.notifyList{}.
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//
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// goexperiment.staticlockranking
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// does change it slightly, but
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// this does not alter the first
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// 2 fields which are all we need.
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type notifyList struct { |
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_ atomic.Uint32 |
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notify uint32 |
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// ... other fields
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} |
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// NOTE: must remain in
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// sync with sync.Cond{}.
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type syncCond struct { |
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_ struct{} |
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L sync.Locker |
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n notifyList |
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// ... other fields
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} |
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// This field must be atomcially accessed.
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cptr := (*syncCond)(unsafe.Pointer(c)) |
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return atomic.LoadUint32(&cptr.n.notify) |
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} |
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