fun parkedWorkersStackTopUpdate()

in kotlinx-coroutines-core/jvm/src/scheduling/CoroutineScheduler.kt [162:178]

• 17 lines of code
• 5 McCabe index (conditional complexity)

    fun parkedWorkersStackTopUpdate(worker: Worker, oldIndex: Int, newIndex: Int) {
        parkedWorkersStack.loop { top ->
            val index = (top and PARKED_INDEX_MASK).toInt()
            val updVersion = (top + PARKED_VERSION_INC) and PARKED_VERSION_MASK
            val updIndex = if (index == oldIndex) {
                if (newIndex == 0) {
                    parkedWorkersStackNextIndex(worker)
                } else {
                    newIndex
                }
            } else {
                index // no change to index, but update version
            }
            if (updIndex < 0) return@loop // retry
            if (parkedWorkersStack.compareAndSet(top, updVersion or updIndex.toLong())) return
        }
    }