Fix multi-thread issues in StreamHandler

In current design, it is possible that the client stops a video stream
before the last analyze thread is scheduled.  Because stopping a video
stream sets an analyzer callback as null, the analyze thread will
therefore be crashed as soon as it is scheduled.

To prevent this, this change adds a mutex to protect shared variables
and adds a nullcheck in a analyze thread.

Fix: 150255890
Test: m -j libevssupport and run face enrollment w/ user switching
Change-Id: I161be8d69f8116846f3863a6e60e491ccf1af2ca
2 files changed
tree: 89afc4fe99dec807d7599c7a81748a9982c346c6
  1. car-bugreportd/
  2. car-default-input-service/
  3. car-lib/
  4. car-maps-placeholder/
  5. car-systemtest-lib/
  6. car-test-lib/
  7. car-usb-handler/
  8. car_product/
  9. computepipe/
  10. EncryptionRunner/
  11. evs/
  12. experimental/
  13. FrameworkPackageStubs/
  14. obd2-lib/
  15. procfs-inspector/
  16. service/
  17. surround_view/
  18. tests/
  19. tools/
  20. user/
  21. vehicle-hal-support-lib/
  22. watchdog/
  23. .clang-format
  24. .gitignore
  25. Android.mk
  26. CleanSpec.mk
  27. CPPLINT.cfg
  28. OWNERS
  29. PREUPLOAD.cfg
  30. README.md
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.