[bedrock] Add an async task runnable for testing

Often we want to run some logic as a new program/runnable. The
task::create_task function wraps a Future<()> into a runnable that also
supports cancellation and observing exit.

Two refactors to make this work:
- Introduced a Lifecycle trait under Program, that exposes an on_exit
  with user specifiable exit information type.
- stop takes a &mut self, since stopping a task apparently requires,
  umm, modifying the task.

Bug: 122024
Change-Id: I917c2251638811354629b33167457c055d8c3625
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/825958
Reviewed-by: Yegor Pomortsev <ypomortsev@google.com>
Commit-Queue: Yifei Teng <yifeit@google.com>
Reviewed-by: Claire Gonyeo <cgonyeo@google.com>
10 files changed
tree: 89cdb2160ba8effeb9573bf04e22c54ac269e352
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gitmodules
  20. .gn
  21. .ignore
  22. .style.yapf
  23. analysis_options.yaml
  24. AUTHORS
  25. BUILD.gn
  26. CODE_OF_CONDUCT.md
  27. CONTRIBUTING.md
  28. fuchsia.code-workspace
  29. LICENSE
  30. OWNERS
  31. PATENTS
  32. pyrightconfig.json
  33. README.md
  34. rustfmt.toml
README.md

Fuchsia

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Read more about Fuchsia's principles.

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