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#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#ifdef __WIN32__
#include <windows.h>
#endif
#ifdef __MACH__
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#include "til_limits.h"
#include "til_util.h"
#define TIL_SYSFS_CPU "/sys/devices/system/cpu/cpu"
unsigned til_get_ncpus(void)
{
#ifdef __WIN32__
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return MIN(sysinfo.dwNumberOfProcessors, TIL_MAXCPUS);
#endif
#ifdef __MACH__
int count;
size_t count_len = sizeof(count);
if (sysctlbyname("hw.logicalcpu_max", &count, &count_len, NULL, 0) < 0)
return 1;
return MIN(count, TIL_MAXCPUS);
#else
char path[cstrlen(TIL_SYSFS_CPU "1024") + 1];
unsigned n;
for (n = 0; n < TIL_MAXCPUS; n++) {
snprintf(path, sizeof(path), "%s%u", TIL_SYSFS_CPU, n);
if (access(path, F_OK) == -1)
break;
}
return n == 0 ? 1 : n;
#endif
}
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