You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tsc_sync.rs
    path of file: ./repos/redshirt/kernel/standalone/src/arch/x86_64/apic
    
    the code of the file until where you have to start completion: // Copyright (C) 2019-2021  Pierre Krieger
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hop
    
    pub fn sync(&mut self) {
        assert!(Arc::strong_count(&self.shared) >= 2);

        // Barrier to synchronize the source and destination.
        self.shared
            .start_barrier
            .fetch_add(1, atomic::Ordering::SeqCst);
        // TODO: add some guarantee that we don't spin forever? do something in the Drop impl?
        while self.shared.start_barrier.load(atomic::Ordering::SeqCst) != 2 {
            atomic::spin_loop_hint();
        }

        for _ in 0..100000 {
            let mut lock = self.shared.src_rdtsc_storage.lock();
            // We grab the local RDTSC value *after* grabbing the lock.
            *lock = volatile_rdtsc();
        }
    }