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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.
I’m using Linux and C/C++. Maybe i can put some Qt/Boost, but is better to be something native.
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?You might also call clock_gettime with
CLOCK_MONOTONICNB. This is specific to Linux.