prompt-toolkit / prompt-toolkit/python-prompt-toolkit

Improve `call_soon_threadsafe` (with `max_postpone_timeout`) to provide good cancellation.

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Python
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Description

See this commit: https://github.com/prompt-toolkit/python-prompt-toolkit/commit/7f0541b4d2cb5c5ba28db54bbf221a9388715569

Because this function is not a coroutine, we had no way to deal with cancellation.

Maybe make it a coroutine and do something like:

async def call_soon_threadsafe(...):
    while not loop._ready:
        await sleep(0)
        if timeout:
           break

    await func()

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Read the referenced commit first, then locate call_soon_threadsafe and max_postpone_timeout in the repository to understand the current scheduling path. Define how cancellation should work, evaluate the proposed coroutine direction, and verify the resulting behavior with focused asynchronous tests.

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Assessment

Tech stack
python
Domain
cli
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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