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docs: avoid mentioning blocking the event loop in async implementation #115

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merged 1 commit into from
Feb 25, 2024

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@michalc michalc commented Feb 25, 2024

I think I was conflating a few different things when writing about avoiding blocking the event loop as a reason for using threads in the async implementation.

The reasoning for using threads is more:

  • async_stream_zip takes async iterables
  • which means if delegating to stream_zip, it would need to call async functions like anext or __anext__ from sync functions, and wait for them to complete.
  • there is only really one choice for this that works/avoids deadlock: run_coroutine_threadsafe.
  • which means this call must be in a different thread

I think I was conflating a few different things when writing about avoiding
blocking the event loop as a reason for using threads in the async
implementation.

The reasoning for using threads is more:

- async_stream_zip takes async iterables
- which means if delegating to stream_zip, it would need to call async
  functions like anext or __anext__ from sync functions, and wait for them to
  complete.
- there is only really one choice for this that works/avoids deadlock:
  run_coroutine_threadsafe.
- which means this call must be in a different thread
@michalc michalc force-pushed the docs/avoid-blocking-event-loop-mention branch from 07be1b3 to 8e8e6f0 Compare February 25, 2024 10:43
@michalc michalc merged commit c8a4503 into main Feb 25, 2024
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@michalc michalc deleted the docs/avoid-blocking-event-loop-mention branch February 25, 2024 10:43
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