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object Test {
class Lock
val lock1 = new Lock
val lock2 = new Lock
private[this] var took2: Boolean = false
def lock2Taken(): Unit = synchronized {
took2 = true
notify()
}
def tookLock2: Boolean = synchronized(took2)
val thread1 = new Thread {
override def run(): Unit = synchronized {
lock1.synchronized {
while (!tookLock2) wait()
lock2.synchronized {
println("thread1 in lock2!")
}
}
println("thread1, done!")
}
}
val thread2 = new Thread {
override def run(): Unit = synchronized {
lock2.synchronized {
lock2Taken()
lock1.synchronized {
println("thread2 in lock1!")
}
}
println("thread2, done!")
}
}
def main(args: Array[String]): Unit = {
thread1.start() // takes lock1 then sleeps 1s - tries to take lock2
thread2.start() // takes lock2 then sleeps 1s - tries to take lock1
thread1.join() // wait for threads to complete, can't because deadlock!
thread2.join()
}
}
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