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对任何timer而言都存在一点点延迟,因为系统只是周期性地检查那个timer结束了,而timer和interrupt(中断)的处理又需要花费一些时间。因此,timer的时间长度将会是它们所指定的时间加上一小段(取决于实现的质量和当下情势)
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虽然有了高精度timer的出现, 内核并没有抛弃老的低精度timer机制(内核开发人员试图整合高精度timer和低精度的timer,不过失败了,所以目前内核中,两种timer是同时存在的)。当系统处于高精度timer的时候(tick device处于one shot mode),系统会setup一个特别的高精度timer(可以称之sched timer),该高精度timer会周期性的触...
cfg) def onTimer(self): secsSinceEpoch = time.time() timeTuple = time.localtime(secsSinceEpoch) hour, min, sec = timeTuple[3:6] if sec != self.lastSec: self.lastSec = sec ampm = ((hour >= 12) and 'PM') or 'AM' # 0...23 hour = (hour % 12) or 12 # 12..11 self...
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name:是给这个定时事件设备起的一个名字,一般比较直观,在/proc/timer_list中或者dmesg中都会出现。 rating:代表这个定时事件设备的精度值,其取值范围从1到499,数字越大代表设备的精度越高。当系统中同时有多个定时事件设备存在的时候,内核可以根据这个值选一个最佳的设备。
...这个函数的返回值是0或者是以前设定的闹钟时间还余下的秒数。...三、setitimer 和不同精度的睡眠 1、首先来看三种不同的时间结构,如下: time_t; /* seconds */ struct timeval { long tv_sec; 1.2K00 Android Handler机制3之SystemClock类