Add locking to avoid race conditions in cache #118
+48
−4
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Currently, if two replay instances execute the same block at the same time, race conditions can appear when writing to the cache, corrupting it's state.
This PR fixes it by using file locks to ensure that only one process modifies the cache at a time.
I added fs2 as a dependency, as the file lock API of the standard fs crate is nightly only.