Monitors

Object with a set of monitor procedures => one thread may be active at a time

• Motivation: Concurrent Programming + Object-Oriented Programming
• Language implementation of mutex => Compiler automatically inserts lock and unlock operations upon entry and exit of monitor procedures

class Account {
    int balance;
    public synchronized void deposit() {
        balance++;
    }

    public synchronized void withdraw() {
        balance--;
    }
}

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