出力の一時停止と再開
Posted feedbacks - Scala
scala.concurrentを使って書いてみました。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | import scala.concurrent.Lock
import scala.concurrent.ops.spawn
object Main extends Application {
var l:Lock = new Lock
var r:Boolean = true
var q:Boolean = false
def watch:Unit = {
var rec:Boolean = true
try {
l.acquire
if (Console.in.ready) {
Console.readLine.charAt(0) match {
case 'q' => {
r = false
q = true
rec = false
}
case 'p' => r = !r
case _ => Console.println("p[ENTER] :pause/resume\nq[ENTER] :quit")
}
}
} catch {
case e:StringIndexOutOfBoundsException => ()
case e:Exception => {
e.printStackTrace
r = false
q = true
rec = false
}
} finally {
l.release
}
if (rec) {
Thread.sleep(100)
watch
}
}
def write:Unit = {
var rec:Boolean = true
try {
l.acquire
if (r) Console.print('a')
rec = !q
} finally {
l.release
}
if (rec) {
Thread.sleep(1000)
write
}
}
spawn(watch)
spawn(write)
}
|
nobsun
#6346()
Rating3/3=1.00
起動すると、標準出力に1秒毎に'a'の1文字を出力し続けるプログラムで、 以下の条件を満たすものを「どう書く？」
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