在类Unix系统上以秒或毫秒为单位获取正常运行时间 [英] Get uptime in seconds or miliseconds on Unix like systems

问题描述

我需要一个方法，它可以给我从系统启动以来经过的毫秒数或秒数。
我可以解析 / proc / uptime ，但我不能失去在这个I / 0和解析的性能。

I need a method which can give me the number of miliseconds or seconds, elapsed since the system was started. I could parse /proc/uptime , but i can't afford to lose performance over this I/0 and parsing.

我使用Linux和C / C ++。

I'm using Linux and C/C++. Maybe i can put some Qt/Boost, but is better to be something native.

推荐答案

为什么你不能读懂 / proc / uptime ？它不是真正的文件，所以读取它应该是快速的（没有真正的i / o涉及，因为 / proc / 文件系统包含伪文件）。

Why cannot you afford reading /proc/uptime? It is not a real file so reading it should be quick (there is no real i/o involved, since the /proc/ filesystem contains pseudo-files). Did you benchmark its reading?

您也可以拨打 clock_gettime a>与 CLOCK_MONOTONIC

You might also call clock_gettime with CLOCK_MONOTONIC

NB。这是特定于Linux的。

NB. This is specific to Linux.

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