[Android] Print the stack of deadlocked threads when sharding.

build/android/pylib/utils/reraiser_thread_unittest.py

Index: build/android/pylib/utils/reraiser_thread_unittest.py
diff --git a/build/android/pylib/utils/reraiser_thread_unittest.py b/build/android/pylib/utils/reraiser_thread_unittest.py
index 9228829fa23e25c98cb683d635d37ac36a547473..f82be508ba1f4723f14496fbf335733dad1c7a80 100644
--- a/build/android/pylib/utils/reraiser_thread_unittest.py
+++ b/build/android/pylib/utils/reraiser_thread_unittest.py
@@ -4,9 +4,11 @@
 
 """Unittests for reraiser_thread.py."""
 
+import threading
 import unittest
 
 import reraiser_thread
+import watchdog
 
 
 class TestException(Exception):
@@ -75,6 +77,20 @@ class TestReraiserThreadGroup(unittest.TestCase):
     with self.assertRaises(TestException):
       group.JoinAll()
 
+  def testJoinTimeout(self):
+    def f():
+      pass
+    event = threading.Event()
+    def g():
+      event.wait()
+    group = reraiser_thread.ReraiserThreadGroup(
+        [reraiser_thread.ReraiserThread(g),
+         reraiser_thread.ReraiserThread(f)])
+    group.StartAll()
+    with self.assertRaises(reraiser_thread.TimeoutError):
+      group.JoinAll(watchdog.Watchdog(0))

[frankf, 2013/04/03 20:49:52]

Might want test a positive timeout value as well

[craigdh, 2013/04/03 21:17:47]

The other tests call JoinAll with no arguments which defaults to an infinite
timeout. Here we are trying to trigger a timeout, so 0 hits all the same code
paths but doesn't slow down the test.

+    event.set()
+
 
 if __name__ == '__main__':
   unittest.main()