shim Apple's futex primitives #4142
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This is necessary to unblock rust-lang/rust#122408. The documentation for these is available [here](https://developer.apple.com/documentation/os/os_sync_wait_on_address?language=objc). Because the futex wait operations (`os_sync_wait_on_address` et al.) return the number of remaining waiters after returning, this required some changes to the common futex infrastructure, which I've changed to take a callback instead of precalculating the return values.
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Thanks for the PR! I just left for a 1-week business trip and will have to catch up with stuff when I am back so it could take a bit before I can take a closer look. |
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This is necessary to unblock rust-lang/rust#122408. The documentation for these is available here.
Because the futex wait operations (
os_sync_wait_on_addresset al.) return the number of remaining waiters after returning, this required some changes to the common futex infrastructure, which I've changed to take a callback instead of precalculating the return values.