Github user SolidWallOfCode commented on the pull request:
https://github.com/apache/trafficserver/pull/397#issuecomment-166794993
It lets the C++ API lock a mutex that is contained in a continuation in a
scoped fashion. The already existing mutex locking mechanisms handle mutexes
via the POSIX interface ({{pthread_mutex}} via {{pthread_mutex_lock}} and
{{pthread_mutex_unlock}}). Those mutexes are completely independent of ATS
provided mutexes. This makes mutual locking difficult.
{{ScopedContinuationLock}} makes it possible for the C++ API to lock a
continuation in a way that is detectable by core ATS.
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