gistfile1.txt

Mutexed: class {
    .initialize: [closure] {
        .closure: closure
        .mutex: Mutex
    }

    .(): [*args] {
        .mutex.lock
        .closure(*args)
        .mutex.unlock
    }
}

foo: Mutexed [muh] {
    .n: .n? || 0
    .n: .n + 1
    print("in order! #{.n}")
}

foo       // in order! 1
foo       // in order! 2
foo       // in order! 3