Improve exception handling.

run_test_cases.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs each test cases as a single shard, single process execution.
 
 Similar to sharding_supervisor.py but finer grained. Runs multiple instances in
 parallel.
 """
@@ skipping 262 matching lines @@
 
   def join(self, progress=None, timeout=None):
     """Extracts all the results from each threads unordered."""
     if progress and timeout:
       while not self._tasks.join(timeout):
         progress.print_update()
       progress.print_update()
     else:
       self._tasks.join()
     out = []
+    # Look for exceptions.
     for w in self._workers:
       if w.exceptions:
         raise w.exceptions[0][0], w.exceptions[0][1], w.exceptions[0][2]
       out.extend(w.outputs)
       w.outputs = []
-    # Look for exceptions.
     return out
 
   def close(self):
     """Closes all the threads."""
     for _ in range(len(self._workers)):
       # Enqueueing None causes the worker to stop.
       self._tasks.put(None)
     for t in self._workers:
       t.join()
 
@@ skipping 596 matching lines @@
       cmd,
       test_cases,
       options.jobs,
       options.timeout,
       options.run_all,
       result_file)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))