fix

src/main/scala/mipt/homework9/Task1.scala

@@ -8,7 +8,7 @@ import scala.reflect.ClassTag
 
 object Task1 {
 
-  def parTraverse[A, B: ClassTag](parallelism: Int)(xs: List[A])(fa: A => Future[B])(
+  def parTraverse[A, B](parallelism: Int)(xs: List[A])(fa: A => Future[B])(
       implicit ex: ExecutionContext
   ): Future[List[B]] = {
     if (xs.isEmpty) {
@@ -24,7 +24,7 @@ object Task1 {
             case scala.util.Success(value) =>
               results(index) = Some(value)
               if (counter.incrementAndGet() == xs.size) {
-                promise.success(results.flatten.toList)
+                promise.success(results.toList.flatten)
               } else {
                 process(index + parallelism)
               }

src/main/scala/mipt/homework9/Task3.scala

@@ -2,7 +2,7 @@ package mipt.homework9
 
 import mipt.utils.Homeworks._
 
-import java.util.concurrent.atomic.AtomicBoolean
+import java.util.concurrent.Semaphore
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.Future
 
@@ -14,29 +14,13 @@ object Task3 {
 
   }
 
-  object EventLoopManager {
-    private val queue        = new java.util.concurrent.ConcurrentLinkedQueue[(() => Any, Any => Unit)]()
-    private val isProcessing = new AtomicBoolean(false)
-
-    def addToQueue(task: (() => Any, Any => Unit)): Unit = {
-      queue.add(task)
-
-      if (isProcessing.compareAndSet(false, true)) {
-        processQueue()
-      }
-    }
-
-    private def processQueue(): Unit = Future {
-      while (!queue.isEmpty) {
-        val (task, callback) = queue.poll()
-        val result           = task()
-        callback(result)
-      }
-      isProcessing.set(false)
-    }
-  }
+  private val guard_runner = new Semaphore(1)
 
   def eventLoop[A, B](f: A => B): EventLoopFunction[A, B] = (a: A, cb: B => Unit) => {
-    EventLoopManager.addToQueue((() => f(a), cb.asInstanceOf[Any => Unit]))
+    guard_runner.acquire()
+    Future(f(a)).onComplete[Unit](x => {
+      x.map(cb)
+      guard_runner.release()
+    })
   }
 }