This introduces the new `Closure` type, and new cancellation semantics.
I've also fixed a few bugs in the EventEngine iomgr implementation that
had gone unnoticed.
* Fix OOM issues in qps tests
* Add more verbose logging.
* Fix clang error
* Fix race between IsCancelled and Read
* Fix build errors from using bool in C code
This commit adds a new symbol GPR_SUPPORT_BINDER_TRANSPORT to
port_platform.h
This will help avoid surprising compilation failure when compiled with
old NDK or low API level
It was determined that an explicit Shutdown method is not necessary, and further, it can be challenging to implement efficiently in some cases. Instead, EventEngines are expected to clean themselves up upon destruction. Anything that relies on an EventEngine's existence must coordinate itself to ensure the engine remains alive for as long as it's needed.
Internal bug b/170934515
In some cases, calling CQ::Next will return true without passing up a
new tag value, which is very much illegal. My expectation is that this
is due to messing up between SHUTDOWN and TIMEOUT in lower layer code
that doesn't particularly matter much to most callers, but was being
erroneously checked here.
It is not possible for such a function to be implemented in a way that
is understood by annotalysis. Mark it deprecated and replace instances
of its use with direct mutex/condvar usage.
Add a bunch of missing thread safety annotations while I'm here.
* Enable retries by default, but add a separate arg for hedging.
* don't need to explicitly enable retries in xDS config selector
* clang-format
* don't need retry_enabled bit anymore
* fix HTTP client filter to restore the send_message op in the batch
* fix retry cancellation when a batch fails on call attempt
* fix clang-tidy
* fix client channel to pass down batches even after cancellation
* fix retry code to pass transport stats back up to the surface
* add some missing payload propagation
* fix retry handling of callbacks for pending batches
* avoid scheduling the same callback twice
* fix some trace messages
* don't avoid starting recv_initial_metadata or recv_message due to recv_trailing_metadata already being started internally
* avoid restarting recv_trailing_metadata after commit if we've already started it internally
* use fast path when retries are not configured
This code adds an iomgr implementation that's backed by an EventEngine. This uses the EventEngine API alone, and separate work will introduce an EventEngine prototype to plug into it.
See also drfloob#1: @nicolasnoble has a pull request against this branch, implementing the libuv-based EventEngine. One goal here is to implement the iomgr code such that it can be merged independently without affecting normal builds.
This implementation can be built using bazel build --cxxopt='-DGRPC_USE_EVENT_ENGINE' :all
Some shortcuts are being taken to get a working, testable version of the engine. EventEngines are not pluggable, for example.
Ashitha Santhosh