Merged revisions 335323 via svnmerge from

Merged revisions 335323 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/10

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  r335323 | oej | 2011-09-12 15:47:13 +0200 (Mån, 12 Sep 2011) | 19 lines

  Merged revisions 335319 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.8

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    r335319 | oej | 2011-09-12 15:25:30 +0200 (Mån, 12 Sep 2011) | 12 lines

    Lock the peer->mvipvt to avoid crashes with SIP history enabled

    After the launch of 1.6 event-based MWI we have two threads handling the peer->mwipvt,
    which cause issues with SIP history additions in combination with the max limit for
    number of history entries.

    Review: https://reviewboard.asterisk.org/r/1373/

    (closes issue ASTERISK-18288)

    Thanks to irrot for peer review. Work with this bug funded by IPvision AS
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@335324 65c4cc65-6c06-0410-ace0-fbb531ad65f3