test_macos_xdma_hardware
========================

.. py:module:: test_macos_xdma_hardware


Attributes
----------

.. autoapisummary::

   test_macos_xdma_hardware.pytestmark


Functions
---------

.. autoapisummary::

   test_macos_xdma_hardware.test_macos_xdma_hardware_discovers_dau_identity
   test_macos_xdma_hardware._scratch_addresses
   test_macos_xdma_hardware.test_concurrent_transfers_on_both_engines_round_trip


Module Contents
---------------

.. py:data:: pytestmark

.. py:function:: test_macos_xdma_hardware_discovers_dau_identity() -> None

.. py:function:: _scratch_addresses() -> tuple[int, int]

   Two device addresses this test may overwrite. Which memory is free to
   clobber is board geometry, so it comes from the bench, not from here.


.. py:function:: test_concurrent_transfers_on_both_engines_round_trip() -> None

   The H2C and C2H engines share the dext's one descriptor ring. Two
   threads each write a pattern and read it back, so their transfers
   interleave across both engines; any transfer that ran on a chain the
   other thread rewrote returns the wrong bytes or fails.