Function write_thread_id

crates/stdlib/src/faulthandler.rs:217–225

(fd: i32, thread_id: u64, is_current: bool)

    // write_thread_id (traceback.c:1240-1256)
    #[cfg(any(unix, windows))]
    fn write_thread_id(fd: i32, thread_id: u64, is_current: bool) {
        if is_current {
            puts(fd, "Current thread ");
        } else {
            puts(fd, "Thread ");
        }
        dump_hexadecimal(fd, thread_id, core::mem::size_of::<usize>() * 2);
        puts(fd, " (most recent call first):\n");
    }

    /// Dump the current thread's live frame chain to fd (signal-safe).
    /// Walks the `Frame.previous` pointer chain starting from the