test/java/lang/ProcessHandle/OnExitTest.java

rev 12544 : 8131168: Refactor ProcessHandleImpl_*.c and add implememtation for AIX
Reviewed-by: rriggs, smarks

@@ -124,10 +124,15 @@
                 Thread.sleep(200L);
                 printf(" subprocess count: %d, waiting for %d%n", processes.size(), expected);
             } while (processes.size() < expected &&
                     Instant.now().isBefore(endTimeout));
 
+            if (processes.size() < expected) {
+                printf("WARNING: not all children have been started. Can't complete test.%n");
+                printf("         You can try to increase the timeout or%n");
+                printf("         you can try to use a faster VM (i.e. not a debug version).%n");
+            }
             children = getAllChildren(procHandle);
 
             ConcurrentHashMap<ProcessHandle, CompletableFuture<ProcessHandle>> completions =
                     new ConcurrentHashMap<>();
             Instant startTime = Instant.now();