src/core. exec_ctx is now a thread_local pointer of type ExecCtx instead of
grpc_exec_ctx which is initialized whenever ExecCtx is instantiated. ExecCtx
also keeps track of the previous exec_ctx so that nesting of exec_ctx is
allowed. This means that there is only one exec_ctx being used at any
time. Also, grpc_exec_ctx_finish is called in the destructor of the
object, and the previous exec_ctx is restored to avoid breaking current
functionality. The code still explicitly calls grpc_exec_ctx_finish
because removing all such instances causes the code to break.
- make closures know where they should be executed (eg, on a workqueue,
or a combiner, or on an exec_ctx)
- this allows removal of a large number of trampoline functions that
were appearing whenever we used combiners, and should allow for a much
easier interface to combiner locks
This extends the existing http parser to support requests as well as responses.
httpcli continues to exist and work as it has previously, though in the new
directory src/core/http (to reflect the fact the directory now contains code
relevant to parsing requests, which httpcli would not generally involve itself
in).
Starting to allow for >1 implementation of pollset within a binary.
Do so without requiring an extra allocation for completion queues (which
we could not tolerate).