ART: Add warmup to 063-process-manager

Experimental CL to see if it fixes a guessed race for static
initialization of internal helper classes.

Bug: 2310700
Test: art/test/testrunner/testrunner.py -b --host -t 063
Change-Id: I4e1706771aae9ba21494b754a50277d2c7df9ec1

1 files changed, 10 insertions, 0 deletions

diff --git a/test/063-process-manager/src/Main.java b/test/063-process-manager/src/Main.java
index 6cb594959e..1005b77107 100644
--- a/test/063-process-manager/src/Main.java
+++ b/test/063-process-manager/src/Main.java
@@ -3,6 +3,16 @@ import java.util.Map;
 public class Main {
     static public void main(String[] args) throws Exception {
         checkManager();
+
+        // Warm up the reaper so that there are no issues with scheduling because of static
+        // initialization.
+        {
+            ProcessBuilder pb = new ProcessBuilder("sleep", "0");
+            Process proc = pb.start();
+            proc.waitFor();
+            Thread.sleep(500);  // Consider checking for (and waiting on) the reaper state here.
+        }
+
         for (int i = 1; i <= 2; i++) {
             System.out.println("\nspawning child #" + i);
             child();