[breaking][core-graphics] Enforce Sendness of CGEventTap callback (soundness fix) #725
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This prevents a failure mode of handling the Result of CGEventTap::new() but not saving the tap itself.
This was previously unsound.
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cc @wusyong |
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There was an aspect of unsoundness missed in #710. The callback can capture state from the current thread that is not
Send, but the tap can be installed on another thread's event loop.This change fixes the unsoundness while providing a way to safely and conveniently use the API that fits most use cases.
CGEventTap::with(unreleased API) was renamed towith_enabledbecause it actually installs and enables the tap now.Also make CGEventTap
#[must_use]so users ofnewdon't accidentally drop the tap.This change is currently based on #724 but can be rebased if you want to merge it independently.