[ffi/samples] Fix samples/ffi/http so it passes under tsan.

Before this fix running under tsan produces following warning:
```
00:00 +0: httpGet

00:03 +1: httpServe

00:04 +2: All tests passed!

/usr/bin/addr2line: DWARF error: mangled line number section (bad file number)
/usr/bin/addr2line: DWARF error: mangled line number section (bad file number)
/usr/bin/addr2line: DWARF error: mangled line number section (bad file number)
/usr/bin/addr2line: DWARF error: mangled line number section (bad file number)
/usr/bin/addr2line: DWARF error: mangled line number section (bad file number)
==================
WARNING: ThreadSanitizer: signal-unsafe call inside of a signal (pid=145964)
    #0 malloc ../../../../../../llvm-llvm-project/../../../../../../llvm-llvm-project/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp:676 (dartvm+0x21c9330) (BuildId: d195bc5e9885ab144039c676e433289217750aec)
    #1 __dcigettext intl/./intl/dcigettext.c:621 (libc.so.6+0x39f23) (BuildId: 4a95b54430cb5a2c68c1812f1738222660dec6d1)
    #2 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool, int, __sanitizer::__sanitizer_siginfo*, void*) ../../../../../../llvm-llvm-project/../../../../../../llvm-llvm-project/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp:2149 (dartvm+0x21d34af) (BuildId: d195bc5e9885ab144039c676e433289217750aec)

SUMMARY: ThreadSanitizer: signal-unsafe call inside of a signal intl/./intl/dcigettext.c:621 in __dcigettext
==================
ThreadSanitizer: reported 1 warnings
```

TEST=samples/ffi/http

Change-Id: I4cd1b62d30cde3ff0d4cd5f6a23c33e36491884a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/445284
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: Liam Appelbe <liama@google.com>
3 files changed
tree: 17ba181f68843675f3ede3dd89df89279809db7f
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. DEPS
  27. LICENSE
  28. OWNERS
  29. PATENT_GRANT
  30. PRESUBMIT.py
  31. pubspec.yaml
  32. README.dart-sdk
  33. README.md
  34. sdk.code-workspace
  35. sdk_args.gni
  36. sdk_packages.yaml
  37. SECURITY.md
  38. WATCHLISTS
README.md

Dart

An approachable, portable, and productive language for high-quality apps on any platform

Dart is:

  • Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.

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Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

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Dart platforms illustration

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See LICENSE and PATENT_GRANT.

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