// Write data — backpressure is enforced
// the writables internal backpressure is cleared and
。关于这个话题，im钱包官方下载提供了深入分析
The first thing a multi-tasking operating system needs from hardware is isolation: multiple programs must share one processor without being able to read, write, or jump into each other's memory. The 80386 achieves this through memory protection -- two independent address translation layers.，详情可参考heLLoword翻译官方下载
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