8299419: Thread.sleep(millis) may throw OOME

Reviewed-by: alanb

src/java.base/share/classes/java/lang/Thread.java

@@ -457,19 +457,20 @@ public class Thread implements Runnable {
      * Called before sleeping to create a jdk.ThreadSleep event.
      */
     private static ThreadSleepEvent beforeSleep(long nanos) {
-        ThreadSleepEvent event = null;
-        if (ThreadSleepEvent.isTurnedOn()) {
-            try {
-                event = new ThreadSleepEvent();
+        try {
+            ThreadSleepEvent event = new ThreadSleepEvent();
+            if (event.isEnabled()) {
                 event.time = nanos;
                 event.begin();
-            } catch (OutOfMemoryError e) {
-                event = null;
+                return event;
             }
+        } catch (OutOfMemoryError e) {
+            // ignore
         }
-        return event;
+        return null;
     }
 
+
     /**
      * Called after sleeping to commit the jdk.ThreadSleep event.
      */

src/java.base/share/classes/jdk/internal/event/ThreadSleepEvent.java

@@ -30,14 +30,5 @@ package jdk.internal.event;
  */
 
 public final class ThreadSleepEvent extends Event {
-    private static final ThreadSleepEvent EVENT = new ThreadSleepEvent();
-
-    /**
-     * Returns {@code true} if event is enabled, {@code false} otherwise.
-     */
-    public static boolean isTurnedOn() {
-        return EVENT.isEnabled();
-    }
-
     public long time;
 }