Synchronise access to shared `table info` dictionary

Kitura / Swift-Kuery-ORM

An ORM for Swift, built on Codable

Apache License 2.0

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Closed kilnerm closed 5 years ago

kilnerm commented 5 years ago

This PR adds synchronization around access to the dictionary used to store table info.

Without this synchronization concurrent access can lead to crashes on Swift 5.