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#if defined(__GLASGOW_HASKELL__) && (__GLASGOW_HASKELL__ >= 612) && !defined(CABAL_NO_THREADED)
/* Since version 6.12, GHC's threaded RTS includes a getNumberOfProcessors
function, so we try to use that if available. cabal-install is always built
with -threaded nowadays. */
#define HAS_GET_NUMBER_OF_PROCESSORS
#endif
#ifndef HAS_GET_NUMBER_OF_PROCESSORS
#ifdef _WIN32
#include <windows.h>
#elif MACOS
#include <sys/param.h>
#include <sys/sysctl.h>
#elif __linux__
#include <unistd.h>
#endif
int getNumberOfProcessors() {
#ifdef WIN32
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return sysinfo.dwNumberOfProcessors;
#elif MACOS
int nm[2];
size_t len = 4;
uint32_t count;
nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
sysctl(nm, 2, &count, &len, NULL, 0);
if(count < 1) {
nm[1] = HW_NCPU;
sysctl(nm, 2, &count, &len, NULL, 0);
if(count < 1) { count = 1; }
}
return count;
#elif __linux__
return sysconf(_SC_NPROCESSORS_ONLN);
#else
return 1;
#endif
}
#endif /* HAS_GET_NUMBER_OF_PROCESSORS */
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