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The Condition Interface
await()
signal() & signalAll()
An Example

So what happens if the "from" account doesn't have enough funds?

So far, we haven't considered this possibility. Let's now consider it.

If there are insufficient funds, we have two choices:

1. Give up, and report the problem, never having transferred any funds, or
2. Wait until there are sufficient funds, and then perform the transfer.

Let's say we choose the latter.  

This is a job for Condition Objects (a.k.a., for historical reasons, Condition Variables).