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Ran 21 Jun 2023 01:13PM UTC

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Committed 21 Jun 2023 01:03PM UTC coverage: 73.533%. First build

Job # 5334439569.1

Build Type

push

github

Committed by

bmerry

Commit Message

Eliminate some std::shared_ptr refcount twiddling

Readers typically have a chain of completion handlers, each of which
schedules the next. Previously, each completion handler would create a
new copy of the std::shared_ptr<stream_base::shared_state>, which would
cause atomic refcount twiddling potentially for every packet.

Instead, encapsulate the shared_ptr in an opaque `handler_context`
structure which gets passed along the chain. The `handler_context` is
marked as non-copyable, to ensure that we don't accidentally inc and dec
the ref-count unnecessarily. This revealed that using the legacy
`io_context::post` function doesn't support non-copyable completion
handlers, and we had to use `boost::asio::post` instead. That means
Boost 1.66 will be the minimum version.

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