这个函数释放一个打开文件。

This releases an open file.

youdao

对于实现了析构函数释放非内存资源的对象来说，这是最常见的问题。

This is mostly a problem with objects that implement a destructor to free non-memory resources.

youdao

spin_unlock _ irqrestore函数释放自旋锁，并且(通过flags参数)恢复中断。

The spin_unlock_irqrestore function releases the spinlock and restores the interrupts (via the flags argument).

youdao