lock_test.kt

@Volatile var i = 0
val lock = AtomicInteger(0)

fun LockSynchronized()
{
    synchronized(this) {
        i++
    }
}

fun LockAtomic()
{
    while (true) {
        if (lock.compareAndExchange(0, 1) != 0) {
            continue
        }
        i++
        lock.set(0)
        break
    }
}

fun LockTest1()
{
    for (i in 0..5000000) {
        LockSynchronized()
    }
    for (j in 0..10) {
        val start = System.nanoTime()
        for (i in 0..1000000) {
            LockSynchronized()
        }
        val end = System.nanoTime()
        println(end - start)
    }
}

fun LockTest2()
{
    for (i in 0..5000000) {
        LockAtomic()
    }
    for (j in 0..10) {
        val start = System.nanoTime()
        for (i in 0..1000000) {
            LockAtomic()
        }
        val end = System.nanoTime()
        println(end - start)
    }
}