engine: shared schema gate and the write critical section (RFC 2026-09-18) - #783

Merged

azimafroozeh merged 14 commits into

mainfrom

claude/impl-shared-schema-gate

Sep 28, 2026

Commits on Sep 28, 2026

engine: shared/exclusive schema-gate slot on the write-queue manager

ragnorc
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azimafroozeh
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900d0f2
engine: flip the schema gate to shared/exclusive at every site

ragnorc
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azimafroozeh
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b9f0640
test: pin the shared schema gate's behavior in both directions

ragnorc
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azimafroozeh
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d6ddc21
docs: gate order, read-path claim, and the RFC's implementation record

ragnorc
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azimafroozeh
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64bc256
docs(release): writers no longer serialize on the schema gate (RFC 2026-09-18)

ragnorc
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azimafroozeh
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d74c0d4
test(dst): concurrent-universe arm racing writers against a schema apply

ragnorc
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azimafroozeh
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2906ac7
engine: the write capture parks behind an in-flight schema apply

ragnorc
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azimafroozeh
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90860e6
test(dst): the schema arm lands applies between writer commits

ragnorc
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azimafroozeh
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e2685ff
docs: narrow the read-path claim; record the step 2 measurement

ragnorc
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azimafroozeh
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327cb69
docs(rfc): record the fail-fast prototype and the same-branch ceiling

ragnorc
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azimafroozeh
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8d6b2cd
docs(rfc): attribute the shared gate's gain; retract the one-branch claim

ragnorc
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azimafroozeh
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3d0532e
test
azimafroozeh
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bc09eec
review
azimafroozeh
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ec28c22
Merge branch 'main' into claude/impl-shared-schema-gate
azimafroozeh
authored
36dfd90