function returns the number of processes in the system run queue
averaged over various periods of time.
samples are retrieved and assigned to successive elements of
The system imposes a maximum of 3 samples, representing averages
over the last 1, 5, and 15 minutes, respectively.
If the load average was unobtainable, -1 is returned; otherwise,
the number of samples actually retrieved is returned.
This function is available in glibc since version 2.2.
For an explanation of the terms used in this section, see
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