unix gettimeofday

Under the Unix/linux system, the Gettimeofday function is used to obtain the timestamp of the current system, which can reach a microsecond (microsecond, or μs) level.The information for the current timestamp is stored through the struct

In the analysis of live555CodeOccasional acquisition: If (fisfirstpacket) {// record the fact that we're starting to play now: gettimeofday (& fnextsendtime, null );} UNIX and Linux time systems start from epoch, in seconds. Epoch is the

The basic time service provided by the Unix kernel is the number of seconds that have elapsed since 00:00:00, January 1, January 1, 1970 AD, The International Standard Time. This number of seconds is represented by the Data Type time_t. 1. The time

In project development, in order to improve the efficiency of the program, it is first to locate the part of the code that takes a long time, and then improves the code--to shorten the execution time. This takes a time to get the function to get the

UNIX time can be roughly divided into real-time and time in the struct. 1 \ calculate the number of seconds from 1900 to 1970 rfc1305-Network Time Protocol. In the network protocol, the timestamp format is a four-eight-bit group. The value is the

IOS Time Processing Do not have to do the app to deal with time, about the processing of time, there are many doorways, far from a row of API calls, get the current system time so simple. We need to understand the differences between the various

microtime-returns the current Unix timestamp and microseconds description Mixed Microtime ([bool $get _as_float]) Microtime () The current Unix timestamp and the number of microseconds. This function is only available under an operating system

about Unix Time ①time_t Data Typetypedef long int time_t; Used to store the number of seconds from 1970 to the present. ②timeval Structural Bodystruct Timeval { Long tv_sec; /* SEC * * Long tv_usec; /* microsecond * * }; Structure struct Timeval,

I have been reading books and taking some notes recently. The operating system used in this article is centos7.0. If you do not want to install a dual-system, you can install a virtual machine, refer to

Objective A good timer helps program developers determine the performance bottlenecks of a program, or perform performance comparisons on different algorithms. However, it is not easy to accurately measure the running time of the program, because