All system calls are not real time?

Question

All system calls are not real time?

I heard that executing system calls on Linux (the RT_PREEMPT kernel) is never in real time.

This seems overly restrictive - how could your process do anything (unless it should be done entirely through DMA) without system calls?

Is this true or some system calls (e.g. clock_gettime) in real time?

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linux system-calls real-time

crosstalk Jul 17 '12 at 20:32

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2 answers

Mark Harrison · Answer 1 · 2016-05-07T02:46:42+0000

If “real-time is safe” you mean guaranteed execution for a limited time, then Linux, like most general-purpose operating systems, is not safe in real-time.

(RTOS) .

user877329 · Answer 2 · 2017-05-06T14:25:41+0000

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All system calls are not real time?

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