[asterisk-dev] [Code Review] Fix a deadlock in agents occuring due to trying to lock a channel while having a lock on the pvt.

[jrose]

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https://reviewboard.asterisk.org/r/1708/
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(Updated Feb. 3, 2012, 11:52 a.m.)


Review request for Asterisk Developers, Mark Michelson, rmudgett, and Matt Jordan.


Changes
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Adds Richard's last suggested changes. Had to do a little mental gymnastics on that one.  Technically, I don't really believe it needs to have this proxy pointer to the owning channel anymore since it makes sure the owner stays the same... but I don't want to  uproot the code that's I've put in quite that much without confirming this is the right way to do things.


Summary
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Also adds locking to a number of other functions which are calling ast_bridged_channel (which is documented as requiring a lock for safe running, which was the purpose of irroot's original locking patch in action_agents.

Unlike the other patch on reviewboard right now, this opts to enforce locking order instead of using deadlock avoidance.

Celebrity endorsement: "This looks incredibly sane to me." - MMichelson


This addresses bug ASTERISK-19285.
    https://issues.asterisk.org/jira/browse/ASTERISK-19285


Diffs (updated)
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  /branches/1.8/channels/chan_agent.c 353685 

Diff: https://reviewboard.asterisk.org/r/1708/diff


Testing
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Not much I'm afraid to say. I can't reproduce the issue since it involves real world use over a period of time.  I'll ask Alex Villacís Lasso to give it a shot though.


Thanks,

jrose

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