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:first child margin top: important body :last child margin bottom: important BLOCKS p, blockquote, ul, ol, dl, table, pre margin: px HEADERS h , h , h , h , h , h margin: px px padding: font weight: ...
2017-10-29 02:01 0 2496 推荐指数:
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谈论进程上下文 、中断上下文 、 原子上下文之前,有必要讨论下两个概念: a -- 上下文 上下文是从英文context翻译过来,指的是一种环境。相对于进程而言,就是进程执行时的环境; 具体来说就是各个变量和数据,包括所有的寄存器变量、进程打开的文件、内存信息 ...