[asterisk-dev] [Code Review] 4579: res_pjsip_messaging: Serialize outgoing MESSAGEs

[Mark Michelson]

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Review request for Asterisk Developers.


Bugs: ASTERISK-24937
    https://issues.asterisk.org/jira/browse/ASTERISK-24937


Repository: Asterisk


Description
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Because res_pjsip_messaging throws all messages to send into the threadpool, there is no guarantee that consecutive outgoing messages from the same dialplan execution will be sent in the same order.
So for instance, if you had the following dialplan:

exten => hello,1,NoOp()
same => n,SendMessage(hello)
same => n,SendMessage(world)

It would be expected that the "hello" message would be sent before the "world" message. However, it cannot be guaranteed this will happen with the current threadpool usage.

The patch on this review introduces a serializer for outgoing MESSAGE requests from Asterisk. This ensures that all MESSAGE requests are sent in the same order that they are processed in the dialplan.


Diffs
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  /branches/13/res/res_pjsip_messaging.c 433838 

Diff: https://reviewboard.asterisk.org/r/4579/diff/


Testing
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The bug itself is incredibly difficult to have happen under normal circumstances, but I have confirmed that this patch has not hindered operations any.


Thanks,

Mark Michelson

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