获取系统CPU个数

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小积累

windows

#include <windows.h>

    SYSTEM_INFO sysInfo;
    GetSystemInfo(&sysInfo);
   int num_cpu = sysInfo.dwNumberOfProcessors;

linux

#include <unistd.h>

int num_cpu = sysconf( _SC_NPROCESSORS_CONF);

跨平台

宏