test/jdk/java/util/concurrent/tck/ConcurrentHashMapTest.java

8211283: Miscellaneous changes imported from jsr166 CVS 2018-11
Reviewed-by: martin, chegar

*** 863,868 ****
--- 863,884 ----
          for (int i = 0; i < iterations; i++)
              assertFalse(keySet.removeAll(removeMe));
          assertEquals(mapSize, map.size());
      }
  
+     public void testReentrantComputeIfAbsent() {
+         ConcurrentHashMap<Integer, Integer> map = new ConcurrentHashMap<>(16);
+         try {
+             for (int i = 0; i < 100; i++) { // force a resize
+                 map.computeIfAbsent(i, key -> findValue(map, key));
+             }
+             fail("recursive computeIfAbsent should throw IllegalStateException");
+         } catch (IllegalStateException success) {}
+     }
+ 
+     private Integer findValue(ConcurrentHashMap<Integer, Integer> map,
+                               Integer key) {
+         return (key % 5 == 0) ?  key :
+             map.computeIfAbsent(key + 1, k -> findValue(map, k));
+     }
+ 
  }