ARM体系架构下的同步操作（一）
处理器在访问共享资源时，必须对临界区进行同步，即保证同一时间内，只有一个对临界区的访问者。当共享资源为一内存地址时，原子操作是对该类型共享资源同步访问的最佳方式。随着应用的日益复杂和SMP的广泛使用，处理器都开始提供硬件同步原语以支持原子地更新内存地址。
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