文档介绍：什么是嵌入式系统
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang c入式领域中市场占有率比拟高。但是大多数人认为未来的主流将是Linux，毕竟它式免费的，这里有一份CCID的调查，在这份关于未来三年嵌入式领域首选操作系统的调查中，%排在各操作系统的首位。
嵌入式系统及操作系统重要概念
上下文切换〔Context Switching〕
多任务系统中，上下文切换是指CPU的控制权由运行任务转移到另外一个就绪任务时所发生的事件，当前运行任务转为就绪〔或者挂起、删除〕状态，另一个被选定的就绪任务成为当前任务。上下文切换包括保存当前任务的运行环境，恢复将要运行任务的运行环境。上下文的内容依赖于具体的CPU。
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize internal management, improve staff quality. Adhere to the
actively carry out the law on civil air defense education, drawn out of the air defense in Pingliang city Building under easy fare, daily special inspection and regulation, overfulfilled the province upper and lower knots of up to 500,000 yuan fee collection tasks. 5, further standardize