pd::metrics

Struct LocalRecorderGuard

pub struct LocalRecorderGuard<'a> { /* private fields */ }
Expand description

Guard for setting a local recorder.

When using a local recorder, we take a reference to the recorder and only hold it for as long as the duration of the closure. However, we must store this reference in a static variable (thread-local storage) so that it can be accessed by the macros. This guard ensures that the pointer we store to the reference is cleared when the guard is dropped, so that it can’t be used after the closure has finished, even if the closure panics and unwinds the stack.

§Note

The guard has a lifetime parameter 'a that is bounded using a PhantomData type. This upholds the guard’s contravariance, it must live at most as long as the recorder it takes a reference to. The bounded lifetime prevents accidental use-after-free errors when using a guard directly through crate::set_default_local_recorder.

Trait Implementations§

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impl<'a> Drop for LocalRecorderGuard<'a>

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fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

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impl<'a> Freeze for LocalRecorderGuard<'a>

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impl<'a> !RefUnwindSafe for LocalRecorderGuard<'a>

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impl<'a> !Send for LocalRecorderGuard<'a>

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impl<'a> !Sync for LocalRecorderGuard<'a>

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impl<'a> Unpin for LocalRecorderGuard<'a>

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impl<'a> !UnwindSafe for LocalRecorderGuard<'a>

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