The Unix python client can erroneously throw exceptions from select due to
interrupted system call
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Key: QPID-2294
URL: https://issues.apache.org/jira/browse/QPID-2294
Project: Qpid
Issue Type: Bug
Components: Python Client
Affects Versions: 0.6
Environment: Red Hat Enterprise Linux 5.4
Reporter: Andrew Stitcher
Assignee: Rafael H. Schloming
When running autotools "make check"
You can cause the python_tests to fail in the qpid.tests.messaging section (and
perhaps elsewhere) by resizing the window that is running the tests.
You get something like this:
qpid.tests.messaging.SenderTests.testSendAsyncCapacityUNLIMITED
............................ fail
Error during test:
Traceback (most recent call last):
File
"/home/astitche/bld-working/src/tests/python/commands/qpid-python-test", line
307, in run
phase()
File "/home/astitche/bld-working/src/tests/python/qpid/tests/messaging.py",
line 796, in testSendAsyncCapacityUNLIMITED
self.asyncTest(UNLIMITED)
File "/home/astitche/bld-working/src/tests/python/qpid/tests/messaging.py",
line 777, in asyncTest
drained = self.drain(self.rcv, timeout=self.delay())
File "/home/astitche/bld-working/src/tests/python/qpid/tests/messaging.py",
line 84, in drain
contents.append(rcv.fetch(timeout=timeout).content)
File "<string>", line 6, in fetch
File "/home/astitche/bld-working/src/tests/python/qpid/messaging.py", line
668, in fetch
msg = self.session._get(self._pred, timeout=timeout)
File "<string>", line 6, in _get
File "/home/astitche/bld-working/src/tests/python/qpid/messaging.py", line
360, in _get
timeout):
File "/home/astitche/bld-working/src/tests/python/qpid/messaging.py", line
294, in _ewait
result = self.connection._ewait(lambda: self.error or predicate(),
timeout, exc)
File "/home/astitche/bld-working/src/tests/python/qpid/messaging.py", line
142, in _ewait
result = self._wait(lambda: self.error or predicate(), timeout)
File "/home/astitche/bld-working/src/tests/python/qpid/messaging.py", line
131, in _wait
return self._waiter.wait(predicate, timeout=timeout)
File "/home/astitche/bld-working/src/tests/python/qpid/concurrency.py",
line 59, in wait
self.condition.wait(timeout - passed)
File "/home/astitche/bld-working/src/tests/python/qpid/concurrency.py",
line 96, in wait
sw.wait(timeout)
File "/home/astitche/bld-working/src/tests/python/qpid/compat.py", line 53,
in wait
ready, _, _ = select([self], [], [], timeout)
error: (4, 'Interrupted system call')
The cause is that python is receiving the SIGWINCH signal from the window size
change and this is interrupting the select system call. The exception that is
being thrown by select is not being caught.
This needs to be fixed as interrupted system calls are a fact of life when
running on Unix - you could argue that the python run time should just restart
the select, but it isn't doing that here.
Note that allowing for interrupted system calls screws up the timeout
calculation. As you'll need to figure out how much of the wait is left and then
wait for less time when restarting the system call.
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