[Asterisk-code-review] res_pjsip_refer: Move the progress dlg release to a serializer (asterisk[18])

[George Joseph]

Hello Joshua Colp, Kevin Harwell, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/15534

to look at the new patch set (#2).

Change subject: res_pjsip_refer: Move the progress dlg release to a serializer
......................................................................

res_pjsip_refer: Move the progress dlg release to a serializer

Although the dlg session count was incremented in a pjsip servant
thread, there's no guarantee that the last thread to unref this
progress object was one.  Before we decrement, we need to make
sure that this is either a servant thread or that we push the
decrement to a serializer that is one.

Because pjsip_dlg_dec_session requires the dialog lock, we don't
want to wait on the task to complete if we had to push it to a
serializer.

Change-Id: I8ff2d5d94be3ff04298394070434e22a7d3cbc41
---
M res/res_pjsip_refer.c
1 file changed, 20 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/34/15534/2
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Gerrit-Project: asterisk
Gerrit-Branch: 18
Gerrit-Change-Id: I8ff2d5d94be3ff04298394070434e22a7d3cbc41
Gerrit-Change-Number: 15534
Gerrit-PatchSet: 2
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: newpatchset
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