[GR-58993] Atomics.pause: Limit the number of spin-wait loop iterations.

PullRequest: js/3336

Author: woess

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/builtins/AtomicsBuiltins.java

@@ -1274,6 +1274,8 @@ protected Object doGeneric(VirtualFrame frame, Object maybeTarget, Object index,
     @ImportStatic({JSRuntime.class})
     public abstract static class AtomicsPauseNode extends JSBuiltinNode {
 
+        private static final int MAX_SPIN_WAIT = 1024;
+
         protected AtomicsPauseNode(JSContext context, JSBuiltin builtin) {
             super(context, builtin);
         }
@@ -1287,7 +1289,8 @@ protected static Object pauseOnce(Object n) {
 
         @Specialization
         protected static Object pauseInt(int n) {
-            for (int i = 0; i < n; i++) {
+            int iterations = Math.min(n, MAX_SPIN_WAIT);
+            for (int i = 0; i < iterations; i++) {
                 Thread.onSpinWait();
             }
             return Undefined.instance;