internal/poll: simplify IOCP association checks

This is a step towards deferring adding the handle to IOCP until the
first IO operation.

FD.pollable() obscures the fact that it is really checking if the handle
is associated with the IOCP. This doesn't need to be a function that
checks multiple conditions. It can be a simple boolean field that tracks
whether the handle is associated with the IOCP or not.

For #76391

Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest,gotip-windows-amd64-race
Change-Id: I3ee6532f8a387fb5cfae8ae3d20ea9569f585e71
Reviewed-on: https://go-review.googlesource.com/c/go/+/742282
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
1 file changed
tree: 337802d9de4236aeab552df2b853fa1f74e7fc0b
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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