runtime: make goroutine for wasm async events short-lived

An extra goroutine is necessary to handle asynchronous events on wasm.
However, we do not want this goroutine to exist all the time.
This change makes it short-lived, so it ends after the asynchronous
event was handled.

Fixes #34768

Change-Id: I24626ff0af9d803a01ebe33fbb584d04d2059a44
Reviewed-on: https://go-review.googlesource.com/c/go/+/200497
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
4 files changed
tree: e425983c821567c7c12332293f3664e04b9d6cb1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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