默认是nanosecond 级精度,是系统调用(_sys_clock_gettime()),会有开销。调用频繁的话,可能造成损失性能。但是Linux 2.6.32后可以指定参数CLOCK_REALTIME_COARSE和CLOCK_MONOTONIC_COARSE,粗粒度地获取时间,而不需要发生上下文切换(和gettimeofday()一样也是vdso技术,https:
The nanosecond is a multiple of thesecond, which is theSIbase unit for time. In the metric system, "nano" is the prefix for billionths, or 10-9. Nanoseconds can be abbreviated asns; for example, 1 nanosecond can be written as 1 ns. ...
microsecond 微秒 μs 1e-6秒 nanosecond 纳秒 ns 1e-9秒 picosecond 皮秒 ps 1e-12秒 常用C类型 __time_t和__suseconds_t 我们可以使用ANSI标准库中的time.h头文件,。这个头文件中定义的时间和日期所使用的方法,无论是在结构定义,还是命名,都具有明显的C语言风格。下面,我将说明在C/C++中怎样使用日期...
time_t tv_sec; /*second*/ long tv_nsec; /*nanosecond*/ 1. 2. 3. 4. 该结构体有两个成员变量:tv_sec表示秒,tv_nsec表示纳秒。 4.timeval结构体 struct timeval { time_t tv_sec; /*seconds*/ suseconds tv_usec; /*microseconds*/ 1. 2. 3. 4. 该结构体有两个成员变量:tv_sec表示秒,t...
默认是nanosecond 级精度,是系统调用(_sys_clock_gettime()),会有开销。调用频繁的话,可能造成损失性能。但是Linux 2.6.32后可以指定参数CLOCK_REALTIME_COARSE和CLOCK_MONOTONIC_COARSE,粗粒度地获取时间,而不需要发生上下文切换(和gettimeofday()一样也是vdso技术,https://access.redhat.com/documentation/en-us/red...
Convert nanoseconds to centuries (ns to c) with the time conversion calculator, and learn the nanosecond to century formula.
默认是nanosecond 级精度,是系统调用(_sys_clock_gettime()),会有开销。调用频繁的话,可能造成损失性能。但是Linux 2.6.32后可以指定参数CLOCK_REALTIME_COARSE和CLOCK_MONOTONIC_COARSE,粗粒度地获取时间,而不需要发生上下文切换(和gettimeofday()一样也是vdso技术,...
The time-resolved extrinsic fluorescence of rabbit skeletal troponin C was studied with the protein labeled at Cys-98 with N-(iodoacetyl)-N′-(5-sulfo-1-naphthyl)ethylenediamine. Both the intensity and anisotropy decays followed a biexponential decay law, regardless of the ionic condition, pH, vi...
CFileTime::HourA static data member storing the number of 100-nanosecond intervals that make up one hour. CFileTime::MillisecondA static data member storing the number of 100-nanosecond intervals that make up one millisecond. CFileTime::MinuteA static data member storing the number of 100-nan...
A static data member storing the number of 100-nanosecond intervals that make up one day. 複製 static const ULONGLONG Second = Millisecond* 1000; Example See the example for CFileTime::Millisecond. Requirements Header: atltime.h See Also Concepts CFileTime Class CFileTime Members中文...