Ensure that interruption flag is cleaned up properly

Fixes Kotlin#1691

kotlinx-coroutines-core/jvm/test/scheduling/CoroutineSchedulerTest.kt

@@ -5,10 +5,11 @@
 package kotlinx.coroutines.scheduling
 
 import kotlinx.coroutines.*
-import org.junit.*
+import org.junit.Test
 import java.lang.Runnable
 import java.util.concurrent.*
 import kotlin.coroutines.*
+import kotlin.test.*
 
 class CoroutineSchedulerTest : TestBase() {
 
@@ -127,6 +128,29 @@ class CoroutineSchedulerTest : TestBase() {
  latch.await()
  }
 
+ @Test
+ fun testInterruptionCleanup() {
+ ExperimentalCoroutineDispatcher(1, 1).use {
+ val executor = it.executor
+ var latch = CountDownLatch(1)
+ executor.execute {
+ Thread.currentThread().interrupt()
+ latch.countDown()
+ }
+ latch.await()
+ Thread.sleep(100) // I am really sorry
+ latch = CountDownLatch(1)
+ executor.execute {
+ try {
+ assertFalse(Thread.currentThread().isInterrupted)
+ } finally {
+ latch.countDown()
+ }
+ }
+ latch.await()
+ }
+ }
+
  private fun testUniformDistribution(worker: CoroutineScheduler.Worker, bound: Int) {
  val result = IntArray(bound)
  val iterations = 10_000_000