[Merge] lp:~jamesodhunt/upstart/bug-1357252 into lp:upstart

[James Hunt]

Yes, ideally we'd check to see if any other job instances were using the cgroup before calling cgroup_clear(). However, this is rather more tricky than it appears since:

1) the cgroup stanzas only get expanded in the child processes, and hence only the children know what cgroups they are actually members of.

2) the children don't have the current list of running cgroup job instances - that's back in the parent.




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https://code.launchpad.net/~jamesodhunt/upstart/bug-1357252/+merge/232680
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