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bf416e7daf
The root issue is that dlerror isn't reentrant or even thread safe. The solution implemented here is to make a yielding spin lock over an AtomicFlag. This is pretty hacky, but the best we can do at this point. As far as I can tell, it isn't possible to create a global mutex without having to initialize it in a single threaded context. The Windows code isn't affected since errno is thread-local on Windows and it's running in an atomically block to ensure there isn't a green thread context switch. Closes #8156