Make mailbox push infallible and replace the locked tick-timing buffer with a
lock-free ring.
- channel: HybridChannel::push and Sender::send now return () — overflow always
absorbs, never rejects — dropping the Result<(), T> surface and its callers.
- stats: tick_timings moves from Mutex<VecDeque> to a lock-free crossbeam
ArrayQueue (drop-oldest-on-full), removing the per-tick lock.
- ripple the signature change through worker/runtime/config; drop worker_benchmarks.
- expand runtime_api tests around the new channel/stats shapes.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Trim runtime/worker/channel per coverage-fuzz findings; expand runtime_api tests; drop worker_benchmarks.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Refactoring to logically separate component modules in order to make it easier to develop tests, metrics, tracing, etc.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Adds some basic benchmarking, stress tests. They still need to be properly examined to ensure they are testing the correct properties, but fit for "good enough". Implements the HybridChannel type, which features a channel buffer that can withstand overflows. It does so by providing a dequeue behind a mutex. Without overflow, will push messages into the lock free ArrayQueue implemented by crossbeam_queue; when that buffer fills, will use the locking portion provided by the Mutex<VecDequeue>.
In the future we can even further optimize this, perhaps with some linked list implementations of lock-free channels, but, like the benchmarks, this fits the "good enough" bar for now.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
