h = free_list[classno];
Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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// 优化点：仅i<len时赋值（避免重复赋值，提升效率）
也許可以理解的是，當 Instagram 上無數廣告向我承諾只要每天花不到 30 分鐘就能在 30 天內（甚至更快）教會我一門語言時，我總是反應得相當抗拒。。一键获取谷歌浏览器下载对此有专业解读