# Extra Clang Tools 7 documentation

## clang-tidy - objc-avoid-spinlock

# objc-avoid-spinlock

Finds usages of `OSSpinlock`, which is deprecated due to potential livelock problems.

This check will detect following function invocations:

- `OSSpinlockLock`
- `OSSpinlockTry`
- `OSSpinlockUnlock`

The corresponding information about the problem of `OSSpinlock`: https://blog.postmates.com/why-spinlocks-are-bad-on-ios-b69fc5221058