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Committed 30 Oct 2024 11:23AM UTC coverage: 78.273%. Remained the same

Job # 11592344812.1

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push

github

Committed by

web-flow

Commit Message

CP-52039: Drop Semaphore from Xapi_stdext_threads (#6094)

Prior to version 4.12, OCaml's standard threads library (`systhreads`)
had no builtin concept of a semaphore, so one was implemented in
`Xapi_stdext_threads`.

We replace all usages of this with `Semaphore.Counting` from the
standard library and remove the implementation from
`Xapi_stdext_threads`.

Technically, the interface provided by the previous semaphore is more
general: it permits arbitrary adjustments to the semaphore's counter,
allowing for a "weighted" style of locking. However, this is only used
in one place (with a weight value of 1, which is the same
decrement/increment value as normal).

---

All green on BVT+BST (`207043`) apart from 2 known issues. The number of
users of the semaphore module in the codebase is quite low, which is why
I think it's fine to drop the implementation entirely.

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