RacyActor Phase#2

RacyActor+Phase2.swift

var racyGlobal: [String] = []

@MyGlobalActor
var safeGlobal: [String] = []

class PlainOldClass {
  var unprotectedState: String = []
}

actor class RacyActor {
  let immutableClassReference: PlainOldClass

  func racyFunction(other: RacyActor) async {
    // protected: global variable protected by a global actor
    safeGlobal += ["Safe access"]
  
    // unprotected: global variable not in an actor
    racyGlobal += ["Racy access"]
    
    // unprotected: racyProperty is immutable, but it is a reference type
    // so it allows access to unprotected shared mutable type
    other.takeClass(immutableClassReference)
  }
  
  func takeClass(_ plainClass: PlainOldClass) {
    plainClass.unprotectedState += ["Racy access"]  
  }
}