Method service

src/main/java/field/app/ThreadSync2.kt:228–256

        return ArrayList(current)
    }

    @Volatile
    internal var license: Any? = "-- license -- "

    fun service(): Boolean {
        val didWork = current.size > 0

        for (f in ArrayList(current)) {
            if (f.paused) continue

            if (f.finished)
                current.remove(f)
            else {
                val ll = license
                license = null

//                f.input.put(ll)

                while (!f.input.offer(ll, 5, TimeUnit.SECONDS)) {
                    System.err.println(" waited 5 seconds to fibre $f from ${Thread.currentThread()}")
                }

                license = f.output.take()
            }

            if (f.pauseNext) {
                f.pauseNext = false
                f.paused = true
            }
        }

        return didWork