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Diffstat (limited to 'examples/async/eratosthenes/doc/eratosthenes.rst')
| -rw-r--r-- | examples/async/eratosthenes/doc/eratosthenes.rst | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/examples/async/eratosthenes/doc/eratosthenes.rst b/examples/async/eratosthenes/doc/eratosthenes.rst index fdb095a91..494a94df3 100644 --- a/examples/async/eratosthenes/doc/eratosthenes.rst +++ b/examples/async/eratosthenes/doc/eratosthenes.rst @@ -6,9 +6,18 @@ The Python language provides keywords for asynchronous operations, i.e., event loop (see `PEP 492 <https://peps.python.org/pep-0492/>`_). It is up to packages to implement an event loop, support for these keywords, and more. -One such package is `trio`. Since both an async package and Qt itself work with -event loops, special care must be taken to ensure that both event loops work -with each other. trio offers a dedicated `low-level API +The best-known package for this is `asyncio`. Since both an async package and +Qt itself work with event loops, special care must be taken to ensure that both +event loops work with each other. asyncio offers a function `stop` that allows +stopping an event loop without closing it. If it is called while a loop is +running through `run_forever`, the loop will run the current batch of callbacks +and then exit. New callbacks wil be scheduled the next time `run_forever` is +called. + +This approach is highly experimental and does not represent the state of the +art of integrating Qt with asyncio. Instead it should rather be regarded more +as a proof of concept to contrast asyncio with other async packages such as +`trio`, which offers a dedicated `low-level API <https://trio.readthedocs.io/en/stable/reference-lowlevel.html>`_ for more complicated use cases such as this. Specifically, there exists a function `start_guest_run` that enables running the Trio event loop as a "guest" inside @@ -34,9 +43,11 @@ Both examples feature: 1. A window class. 2. An `AsyncHelper` class containing `start_guest_run` plus helpers and - callbacks necessary for its invocation. The entry point for the Trio guest - run is provided as an argument from outside, which can be any async function. - -While `eratosthenes` offloads the asynchronous logic that will run in trio's -event loop into a separate class, `minimal` demonstrates that async functions -can be integrated into any class, including subclasses of Qt classes. + callbacks necessary for its invocation. The entry point for the Trio/asyncio + guest run is provided as an argument from outside, which can be any async + function. + +While `eratosthenes` offloads the asynchronous logic that will run in +trio's/asyncio's event loop into a separate class, `minimal` demonstrates that +async functions can be integrated into any class, including subclasses of Qt +classes. |