Function cleanup_tempfiles_signal_safe

pub fn cleanup_tempfiles_signal_safe()

Remove all tempfiles still registered on our global registry, and leak their data to be signal-safe. This happens on a best-effort basis with all errors being ignored.

Safety

Note that Mutexes of any kind are not allowed, and so aren’t allocation or deallocation of memory. We are using lock-free datastructures and sprinkle in std::mem::forget to avoid deallocating. Most importantly, we use try_lock() which uses an atomic int only without blocking, making our register method safe to use, at the expense of possibly missing a lock file if another thread wants to obtain it or put it back (i.e. mutates the registry shard).