linux 获取CPU个数

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1. #include<stdio.h>
   
2. #include<unistd.h>
   
3. 
   
4. int main()
   
5. {
   
6. int cpu_num;
   
7. cpu_num = sysconf(_SC_NPROCESSORS_CONF);
   
8. printf("_SC_NPROCESSORS_CONF=%d\n",cpu_num);
   
9. 
   
10. cpu_num = sysconf(_SC_NPROCESSORS_ONLN);
    
11. printf("_SC_NPROCESSORS_ONLN=%d\n",cpu_num);
    
12. 
    
13. return 0;
    
14. }
    
15. /*
    
16. * - _SC_NPROCESSORS_CONF
    
17. * The number of processors configured.
    
18. *
    
19. * - _SC_NPROCESSORS_ONLN
    
20. * The number of processors currently online (available).
    
21. */

/* 
* - _SC_NPROCESSORS_CONF
*       The number of processors configured.
* 
* - _SC_NPROCESSORS_ONLN
*       The number of processors currently online (available).
*/ 
#include
#include

int main()
{
int cpu_num;
cpu_num = sysconf(_SC_NPROCESSORS_CONF);
printf("_SC_NPROCESSORS_CONF=%d\n",cpu_num);

cpu_num = sysconf(_SC_NPROCESSORS_ONLN);
printf("_SC_NPROCESSORS_ONLN=%d\n",cpu_num);

return 0;
}