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97694d26c4
This PR contains some small improvements to the safety of consuming/releasing resources to/from the semaphore: * reader_permit: make the low-level `consume()/signal()` API private, making the only user (an RAII class) friend. * reader_resources: split `reset()` into `noexcept` and potentially throwing variant. * reader_resources::reset_to(): try harder to avoid calling `consume()` (when the new resource amount is smaller then the previous one) Closes #13678 * github.com:scylladb/scylladb: reader_permit: resource_units::reset_to(): try harder to avoid calling consume() reader_permit: split resource_units::reset() reader_permit: make consume()/signal() API private