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The `_lwp_self` function cannot be used to reliably determine the main thread, see https://github.com/alacritty/alacritty/issues/2631#issuecomment-676723289. It might always be equal to the PID, but it's certainly not always 1 when the thread is the main thread. However, Rust's built in `Thread::id` and `Thread::name` function will always return `ThreadId(1)` and `Some("main")`. Since converting the thread's ID to a number is not supported on stable Rust, checking that the thread is labeled `Some("main")` seems like the most reliable option. It should also be a good fallback in general.