multithreading - Programmatically find the number of CPUs on a machine (CPUS, not cores) -

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is there way find programmatically (c code only, linux os) number of physical cpus (not cores) ? (something similar sysconf(_sc_nprocessors_conf))

all solutions found on site explain how find number of cores. need information set threads exchange data run on same physical cpu. can information /proc/cpuinfo prefer chose second option.


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