[Merge] lp:~hopem/ubuntu/raring/python-eventlet/lp1199037 into lp:ubuntu/raring/python-eventlet

[Adam Stokes]

Adam Stokes has proposed merging lp:~hopem/ubuntu/raring/python-eventlet/lp1199037 into lp:ubuntu/raring/python-eventlet.

Requested reviews:
  Ubuntu branches (ubuntu-branches)
Related bugs:
  Bug #1199037 in python-eventlet (Ubuntu Raring): "backport eventlet exception context fix"
  https://bugs.launchpad.net/ubuntu/raring/+source/python-eventlet/+bug/1199037

For more details, see:
https://code.launchpad.net/~hopem/ubuntu/raring/python-eventlet/lp1199037/+merge/177856

If a yield occurs in an except clause prior to wildcard raise, when the thread is re-scheduled the raise generates a TypeError since the caught exception has NoneType e.g.
#!/usr/bin/env python
import eventlet

def exc_test_pass(id):
    try:
        raise Exception("foo[%s]" % (id))
    except Exception as e:
        eventlet.sleep(0) # yield
        raise e

def exc_test_fail(id):
    try:
        raise Exception("foo[%s]" % (id))
    except Exception:
        eventlet.sleep(0) # yield
        raise

pool = eventlet.GreenPool()

# This one does what we want i.e. Exception("foo[0]") get propagated
pool.spawn(exc_test_pass, 0)

# This one does not do what we want since we get a TypeError. This is because
# the caught exception is not being saved/restored by the context switch.
pool.spawn(exc_test_fail, 1)

pool.waitall()

This MP fixes the above.
-- 
https://code.launchpad.net/~hopem/ubuntu/raring/python-eventlet/lp1199037/+merge/177856
Your team Ubuntu branches is requested to review the proposed merge of lp:~hopem/ubuntu/raring/python-eventlet/lp1199037 into lp:ubuntu/raring/python-eventlet.
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