See: https://illumos.org/man/5/epoll

Idea: move logic from src/unix/linux-core.c to src/unix/epoll.c and share that between Linux and Illumos.

Motivation:

• removes 250-300 lines of code from src/unix/sunos.c
• switches to much more battle-hardened code
• makes libuv more efficient because it no longer has to accommodate this event ports quirk:

diff --git a/src/unix/core.c b/s

What should happen if deliver_cancel raises an exception? In the current implementation, the shielded cancel scope will prevent it from propagating until the process exits, which might take a while if the crash occurred before signaling the process in any way. Maybe on exception from a user-specified deliver_cancel we should call the default deliver_cancel to kill the process? Or just kill() since

The number of unit tests we have in torchaudio has grown. It is critical to keep tests organized so as to make it easy for contributors to write tests for the feature they are working on.

Batch consistency tests are for validating that ops return the same result regardless of the number of dimensions/batches/channels. Currently We put all the tests in [test/torchaudio_unittest/batch_consistency