默认情况下，新创建的线程是可接合的。

By default, the new created is joinable.

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线程体包括运行的活动线程和可接合的死线程。

Thread bodies consist of active running threads and dead joinable threads.

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如果您创建一个可接合的线程，但是忘记联接它，其资源或私有内存一直保存在进程空间中，从未进行回收再利用。

If you create a joinable thread but forget to join it, its resources or private memory are always kept in the process space and never reclaimed.

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