internal/mmap: add a test for atomic operations on mmapped files

While investigating golang/go#68311, we became concerned that
assumptions of cross process atomic operations may not hold on all
platforms.

While this logic should be exercised indirectly via telemetry
integration tests, add an explicit test to the mmap package for this
core behavior.

Updates golang/go#68311

Change-Id: Ibf5049e8a2fe03335e394af17f611207ca0f2016
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/597336
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Findley <rfindley@google.com>
1 file changed
tree: 87e3fc7d0eb6c584cb27cface25620deb490c246
  1. cmd/
  2. config/
  3. counter/
  4. crashmonitor/
  5. godev/
  6. internal/
  7. .dockerignore
  8. .eslintrc.json
  9. .gitattributes
  10. .gitignore
  11. .prettierrc.json
  12. .stylelintrc.json
  13. CONTRIBUTING.md
  14. dir.go
  15. doc.go
  16. go.mod
  17. go.sum
  18. LICENSE
  19. mode.go
  20. npm
  21. npx
  22. package-lock.json
  23. package.json
  24. PATENTS
  25. README.md
  26. start.go
  27. start_posix.go
  28. start_test.go
  29. start_windows.go
  30. tsconfig.json
  31. types_alias.go
README.md

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