struct timeval represents and instant in time with two members, tv_sec (seconds) and tv_usec (microseconds). In this representation, tv_usec is not by itself an absolute time it is a sub second offset off of tv_sec.
struct timeval用两个成员表示并及时,tv_sec(秒)和tv_usec(微秒)。在此表示中,tv_usec本身不是绝对时间,它是tv_sec的子秒偏移量。
struct timespec works the same way except that instead of microseconds it's offset (tv_nsec) is stored in nanosecond units.
struct timespec的工作方式相同,只是它的偏移量(tv_nsec)以纳秒单位存储,而不是微秒。
The question is: Is there a standard way to convert between these two?
问题是:有没有一种标准的方法来转换这两者?
2 个解决方案
#1
14
Looking at this doc, I would think multiplying tv_usec by 1000 is sufficient to get tv_nsec.
看看这个文档,我认为将tv_usec乘以1000足以获得tv_nsec。
More important, I suspect is the source of the different structures: they could be filled by different clocks.
更重要的是,我怀疑是不同结构的来源:它们可以由不同的时钟填充。
#2
12
In sys/time.h there are two macros that do what you want:
在sys / time.h中有两个宏可以执行您想要的操作:
TIMEVAL_TO_TIMESPEC(X, Y)
and
TIMESPEC_TO_TIMEVAL(X, Y)
See the docs here: http://www.daemon-systems.org/man/TIMEVAL_TO_TIMESPEC.3.html
请参阅此处的文档:http://www.daemon-systems.org/man/TIMEVAL_TO_TIMESPEC.3.html
#1
14
Looking at this doc, I would think multiplying tv_usec by 1000 is sufficient to get tv_nsec.
看看这个文档,我认为将tv_usec乘以1000足以获得tv_nsec。
More important, I suspect is the source of the different structures: they could be filled by different clocks.
更重要的是,我怀疑是不同结构的来源:它们可以由不同的时钟填充。
#2
12
In sys/time.h there are two macros that do what you want:
在sys / time.h中有两个宏可以执行您想要的操作:
TIMEVAL_TO_TIMESPEC(X, Y)
and
TIMESPEC_TO_TIMEVAL(X, Y)
See the docs here: http://www.daemon-systems.org/man/TIMEVAL_TO_TIMESPEC.3.html
请参阅此处的文档:http://www.daemon-systems.org/man/TIMEVAL_TO_TIMESPEC.3.html