Created
January 17, 2017 04:27
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parallelism on the jvm ii
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| class Account(private var amount: Int = 0) { | |
| def transfer(target:Account, n: Int) = | |
| this.synchronized { | |
| target.synchronized { | |
| this.amount -= n | |
| target.amount += n | |
| } | |
| } | |
| } | |
| def startThread(a: Account, b: Account, n: Int) = { | |
| val t = new Thread { | |
| override def run() { | |
| for (i <- 0 until n) { | |
| a.transfer(b,1) | |
| } | |
| } | |
| } | |
| t.start() | |
| t | |
| } | |
| val a1 = new Account(500000) | |
| val a2 = new Account(700000) | |
| val t = startThread(a1, a2, 150000) | |
| vat s = startThread(a2, a1, 150000) | |
| t.join() | |
| s.join() |
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