Count the number of cores on iOS

cores.m

#include <mach/mach_host.h>

unsigned int countCores()
{
    host_basic_info_data_t hostInfo;
    mach_msg_type_number_t infoCount;
    
    infoCount = HOST_BASIC_INFO_COUNT;
    host_info(mach_host_self(), HOST_BASIC_INFO,
              (host_info_t)&hostInfo, &infoCount);
    
    return (unsigned int)(hostInfo.max_cpus);
}