FT Edit: Access on iOS and web
"We hope that this action by Waitrose sends it to the top of the political agenda," he said.
，这一点在heLLoword翻译官方下载中也有详细论述
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.
// Even if the readable side's buffer is full, this succeeds
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