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* Prevent deadlocks with load interlock and DB lock.Brent Wheeldon2017-11-091-0/+55
This fixes an issue where competing threads deadlock each other. - Thread A holds the load interlock but is blocked on getting the DB lock - Thread B holds the DB lock but is blocked on getting the load interlock (for example when there is a `Model.transaction` block that needs to autoload) This solution allows for dependency loading in other threads while a thread is waiting to acquire the DB lock. Fixes #31019