在C 11

Thread-Local Variables: A Deeper Dive

When a thread is created, a separate copy of the thread-local variables is assigned to it. These variables can be accessed by all threads, but any modifications made to a particular thread-local variable are only visible to the thread that created it.

Thread-local variables add a new storage duration category to the existing ones:

• Thread-local (exists for the lifetime of a specific thread)
• Avoidance of Thread Interference
• Thread-local variables are beneficial in scenarios where sharing data across threads could lead to interference.例如，考虑一个随机数生成器，该发生器需要为每个线程维护单独的种子。使用线程 - 本地变量确保每个线程生成自己的唯一随机数序列。

多个多个局部较高范围：共享的全局变量过早隔离线程特定的错误和异常处理，thread_local提供了一种创建变量的机制，可以通过特定的线程安全性和隔离线程安全性和隔离线程依赖性数据来访问且可修改的变量。