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Misc #11904

Updated by DorisWooky (DorisWooky DorisWooky) over 3 years ago

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  b9be72f See: https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/52554 

 Why was Thread.exclusive deprecated? It is useful for when you're uncertain about whether the caller is multithreaded or not, and therefore cannot initialize a mutex because the mutex must be initialized in a thread-safe context where it's not possible for multiple caller threads to initialize the mutex concurrently. 

 One use case is here: this is an idempotent native function invoked via FFI. The contract is that it can be called repeatedly, but only by one thread at a time (concurrent calls from multiple threads can potentially corrupt its internal state): 

 https://github.com/cryptosphere/rbnacl/blob/master/lib/rbnacl.rb#L88 

 Thread.exclusive is useful because it provides an implicit mutex you can ensure is initialized correctly before any other threads start.

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