Github user canselcik commented on the pull request:
https://github.com/apache/trafficserver/pull/323#issuecomment-153950655
@jpeach `ClassAllocator<SpdyClientSession>`, when initialized, creates an
instance of `SpdyClientSession` and puts it aside. At this point, for this
"prototype", `SpdyClientSession::mutex` is `NULL`.
It uses the default constructor to create this instance, and then sets this
instance aside to make duplicates of in the future when asked to.
Normally, whenever `SpdyClientSession` is used, `SpdyClientSession::init()`
is called immediately, but ClassAllocator doesn't perform such a specific
operation as it should be as general as possible.
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