1. 先占：假如在数据写入之前,使用shared_sensor的另一个线程或ISR先占(preempt)了这个线程,他将得到原来的传感器读数. 使用临时副本能够防止先占线程读取只经过部分处理的数据. 但是,假如这些代码在一个数据总线不足32位的处理器上运行,
2. preempt的解释
2. 抢占：套[ 书上称:抢占(preempt) 优先级]和 256级中断嵌套[ 书上称:抢占(preempt) 优先级]联到EXTI的电源电压检测(PVD)中断IRQ CHANAEL 3 通道 = 255 中断优先级 RTC 实时时钟(RTC)全局中断联到EXTI的电源电压检测(PVD)中断IRQ CHANAEL 3 通道 = 0x20 中断优先级 RTC 实时时钟(RTC)全局中断是这样的,
3. 取得优先权：groveler 卑躬屈膝者 | preempt 取得优先权 | preen 打扮
4. 优先于：[18] Blue Sky Laws:蓝天法 | [19] preempt:优先于 | [20] Federal Antitrust Laws:联邦反托拉斯法
noun
1. a high bid that is intended to prevent the opposing players from bidding
Synonym: preemptive bidpre-empt
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verb
1. make a preemptive bid in the game of bridge
2. acquire for oneself before others can do so
3. gain possession of by prior right or opportunity, especially so as to obtain the right to buy (land)
4. take the place of or have precedence over
e.g. live broadcast of the presidential debate preempts the regular news hour
discussion of the emergency situation will preempt the lecture by the professor
Synonym: displace