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# Copyright (C) 2010 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Module for handling messages, threads, processes, and concurrency for run-webkit-tests.
Testing is accomplished by having a manager (TestRunner) gather all of the
tests to be run, and sending messages to a pool of workers (TestShellThreads)
to run each test. Each worker communicates with one driver (usually
DumpRenderTree) to run one test at a time and then compare the output against
what we expected to get.
This modules provides a message broker that connects the manager to the
workers: it provides a messaging abstraction and message loops, and
handles launching threads and/or processes depending on the
requested configuration.
"""
import logging
import sys
import time
import traceback
import dump_render_tree_thread
_log = logging.getLogger(__name__)
def get(port, options):
"""Return an instance of a WorkerMessageBroker."""
worker_model = options.worker_model
if worker_model == 'old-inline':
return InlineBroker(port, options)
if worker_model == 'old-threads':
return MultiThreadedBroker(port, options)
raise ValueError('unsupported value for --worker-model: %s' % worker_model)
class _WorkerState(object):
def __init__(self, name):
self.name = name
self.thread = None
class WorkerMessageBroker(object):
def __init__(self, port, options):
self._port = port
self._options = options
self._num_workers = int(self._options.child_processes)
# This maps worker names to their _WorkerState values.
self._workers = {}
def _threads(self):
return tuple([w.thread for w in self._workers.values()])
def start_workers(self, test_runner):
"""Starts up the pool of workers for running the tests.
Args:
test_runner: a handle to the manager/TestRunner object
"""
self._test_runner = test_runner
for worker_number in xrange(self._num_workers):
worker = _WorkerState('worker-%d' % worker_number)
worker.thread = self._start_worker(worker_number, worker.name)
self._workers[worker.name] = worker
return self._threads()
def _start_worker(self, worker_number, worker_name):
raise NotImplementedError
def run_message_loop(self):
"""Loop processing messages until done."""
raise NotImplementedError
def cancel_workers(self):
"""Cancel/interrupt any workers that are still alive."""
pass
def cleanup(self):
"""Perform any necessary cleanup on shutdown."""
pass
class InlineBroker(WorkerMessageBroker):
def _start_worker(self, worker_number, worker_name):
# FIXME: Replace with something that isn't a thread.
thread = dump_render_tree_thread.TestShellThread(self._port,
self._options, worker_number, worker_name,
self._test_runner._current_filename_queue,
self._test_runner._result_queue)
# Note: Don't start() the thread! If we did, it would actually
# create another thread and start executing it, and we'd no longer
# be single-threaded.
return thread
def run_message_loop(self):
thread = self._threads()[0]
thread.run_in_main_thread(self._test_runner,
self._test_runner._current_result_summary)
self._test_runner.update()
class MultiThreadedBroker(WorkerMessageBroker):
def _start_worker(self, worker_number, worker_name):
thread = dump_render_tree_thread.TestShellThread(self._port,
self._options, worker_number, worker_name,
self._test_runner._current_filename_queue,
self._test_runner._result_queue)
thread.start()
return thread
def run_message_loop(self):
threads = self._threads()
# Loop through all the threads waiting for them to finish.
some_thread_is_alive = True
while some_thread_is_alive:
some_thread_is_alive = False
t = time.time()
for thread in threads:
if thread.isAlive():
some_thread_is_alive = True
next_timeout = thread.next_timeout()
if next_timeout and t > next_timeout:
log_wedged_worker(thread.getName(), thread.id())
thread.clear_next_timeout()
exception_info = thread.exception_info()
if exception_info is not None:
# Re-raise the thread's exception here to make it
# clear that testing was aborted. Otherwise,
# the tests that did not run would be assumed
# to have passed.
raise exception_info[0], exception_info[1], exception_info[2]
self._test_runner.update()
if some_thread_is_alive:
time.sleep(0.01)
def cancel_workers(self):
threads = self._threads()
for thread in threads:
thread.cancel()
def log_wedged_worker(name, id):
"""Log information about the given worker state."""
stack = _find_thread_stack(id)
assert(stack is not None)
_log.error("")
_log.error("%s (tid %d) is wedged" % (name, id))
_log_stack(stack)
_log.error("")
def _find_thread_stack(id):
"""Returns a stack object that can be used to dump a stack trace for
the given thread id (or None if the id is not found)."""
for thread_id, stack in sys._current_frames().items():
if thread_id == id:
return stack
return None
def _log_stack(stack):
"""Log a stack trace to log.error()."""
for filename, lineno, name, line in traceback.extract_stack(stack):
_log.error('File: "%s", line %d, in %s' % (filename, lineno, name))
if line:
_log.error(' %s' % line.strip())
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