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You should never attempt to acquire a lock directly on a bool, or on any other value type. You can acquire a lock only on a reference type, so if you attempt to pass a bool to Monitor.Enter, the C# compiler will do what it always does when you pass a value to a method that expects an object: it will create code that generates a box for the bool, as we saw in 4. You would be acquiring a lock on that box, not on the bool itself. That s a problem, because you get a new box every time, and so your locking would do nothing useful. The lock keyword in C# prevents you from trying to acquire a lock on a value you ll get a compiler error if you try. But if you call the Monitor class s methods directly, C# will not prevent you from making this mistake. So this is another good reason to get into the habit of creating an object that is separate from the state it protects, and acquiring locks on that object.

class WaitForIt { private bool canGo; private object lockObject = new object(); public void WaitUntilReady() { lock (lockObject) { while (!canGo) { Monitor.Wait(lockObject); } } } public void GoNow() { lock (lockObject) { canGo = true; // Wake me up, before you go go. Monitor.PulseAll(lockObject); } }

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The question-and-answer forum, which was one of the most heavily used parts of the site, was literally a thousand times slower than on the old system As far as upgrades, they said, We re going to have this abstraction layer, and you ll never have to actually interact with the database; you ll just talk to this abstraction layer Sure enough, the first time people tried to build a real system for a customer list, they found that the abstractions weren t the right ones, and they had to go underneath and deal directly with the database, which immediately means that, if they ever had to upgrade that to a new version, they would have all the same problems as the old system So they didn t solve the main problem they said it would solve It wasn t true J2EE, either.

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Both methods in this example acquire the lock before doing anything, because both inspect the canGo field, and we expect these to be called on different threads. WaitUntilReady then sits in a loop until that field is true. Each time it goes around the loop, it calls Monitor.Wait. This has three effects: first, it relinquishes the lock that s important, because otherwise, the thread that called GoNow would never get as far as setting the canGo field; second, it makes the thread calling WaitUntilReady block until some other thread calls either Pulse or PulseAll for lockObject; third, when Wait returns, it reacquires the lock.

They said it was going to be J2EE, but they didn t like some of the commercial tools or the open source tools that were available, so they built their own magic persistence layer They built all their own stuff, so customers who looked at it said, This isn t actually J2EE It s a pile of Java crap, yes It s very complicated, yes But it is not J2EE (To be J2EE, it has to use these other components that are standard and distributed by Sun or WebLogic) So they failed to achieve any of their goals The old system took the average programmer about a week to install and figure out and customize a bit The new system was taking an experienced programmer 2 full months to understand.

Why use a loop here Wouldn t an if statement followed by a single call to Wait work In this case it would, but in general it s surprisingly easy to end up generating spurious notifications. Suppose we modified this example so that as well as offering a GoNow, we had a third method called OhHangOnAMinute which put the canGo field back to false the class becomes a gate which can open and close. It would be possible that by the time WaitUntilReady is woken up after a call to GoNow, the field had already transitioned back to false because of a call to OhHangOnAMinute. And while that can t happen with this simpler example, in general it s good to get in the habit of checking to see if the condition you were waiting for really holds when you come out of a wait, and be prepared to wait again if it doesn t.

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