feat(metrics/family): 🍫 add Family::get_or_create_clone()
#244
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cratelyn
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fixes prometheus#231. this introduces a new method to `Family<S, M, C>` to help alleviate the risk of deadlocks when accessing multiple series within a given metrics family. this returns a plain `M`, rather than the `MappedRwLockReadGuard<M>` RAII guard returned by `get_or_create()`. a test case is introduced in this commit to demonstrate that structures accessing multiple series within a single expression will not accidentally create a deadlock. Signed-off-by: katelyn martin <[email protected]>
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i've rebased this commit to address merge conflicts, and added information to the changelog. let me know if there is anything else that needs to be done. i am keen on a release that addresses the deadlocks reported in #231. |
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fixes #231.
this introduces a new method to
Family<S, M, C>to help alleviate the risk of deadlocks when accessing multiple series within a given metrics family.this returns a plain
M, rather than theMappedRwLockReadGuard<M>RAII guard returned byget_or_create().a test case is introduced in this commit to demonstrate that structures accessing multiple series within a single expression will not accidentally create a deadlock.