/* Linux */
#include <sched.h>
int sched_getaffinity(pid_t pid, unsigned int cpusetsize, cpu_set_t
*mask);
static inline int num_processors()
{
unsigned int bit;
int np;
cpu_set_t aff;
memset(&aff, 0, sizeof(aff) );
sched_getaffinity(0, sizeof(aff), &aff );
for(np = 0, bit = 0; bit < 8*sizeof(aff); bit++)
np += (((char *)&aff)[bit / 8] >> (bit % 8)) & 1;
return np;
}
/* Mac OS X */
#include <sys/types.h>
#include <sys/sysctl.h>
static inline int num_processors()
{
int np = 1;
size_t length = sizeof( np );
sysctlbyname("hw.ncpu", &np, &length, NULL, 0);
return np;
}
/* Windows NT */
#include <windows.h>
static inline int num_processors()
{
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwNumberOfProcessors;
}
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