getNumberOfCores.c

SUBMITTED BY: Guest

DATE: Dec. 4, 2013, 12:01 p.m.

FORMAT: C++

SIZE: 812 Bytes

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  1. #ifdef _WIN32
  2. #include <windows.h>
  3. #elif MACOS
  4. #include <sys/param.h>
  5. #include <sys/sysctl.h>
  6. #else
  7. #include <unistd.h>
  8. #endif
  10. int getNumberOfCores() {
  12. #ifdef WIN32
  13. SYSTEM_INFO sysinfo;
  14. GetSystemInfo(&sysinfo);
  15. return sysinfo.dwNumberOfProcessors;
  17. #elif MACOS
  18. int nm[2];
  19. size_t len = 4;
  20. uint32_t count;
  22. nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
  23. sysctl(nm, 2, &count, &len, NULL, 0);
  25. if(count < 1) {
  26. nm[1] = HW_NCPU;
  27. sysctl(nm, 2, &count, &len, NULL, 0);
  28. if(count < 1) { count = 1; }
  29. }
  30. return count;
  31. #else
  33. return sysconf(_SC_NPROCESSORS_ONLN);
  34. #endif
  36. }
  38. # example
  39. # printf("%x", getNumberOfCores());
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