receive-pack: detect aliased updates which can occur with symrefs
[git] / thread-utils.c
1 #include "cache.h"
2
3 #if defined(hpux) || defined(__hpux) || defined(_hpux)
4 #  include <sys/pstat.h>
5 #endif
6
7 /*
8  * By doing this in two steps we can at least get
9  * the function to be somewhat coherent, even
10  * with this disgusting nest of #ifdefs.
11  */
12 #ifndef _SC_NPROCESSORS_ONLN
13 #  ifdef _SC_NPROC_ONLN
14 #    define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
15 #  elif defined _SC_CRAY_NCPU
16 #    define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
17 #  endif
18 #endif
19
20 int online_cpus(void)
21 {
22 #ifdef _SC_NPROCESSORS_ONLN
23         long ncpus;
24 #endif
25
26 #ifdef _WIN32
27         SYSTEM_INFO info;
28         GetSystemInfo(&info);
29
30         if ((int)info.dwNumberOfProcessors > 0)
31                 return (int)info.dwNumberOfProcessors;
32 #elif defined(hpux) || defined(__hpux) || defined(_hpux)
33         struct pst_dynamic psd;
34
35         if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
36                 return (int)psd.psd_proc_cnt;
37 #endif
38
39 #ifdef _SC_NPROCESSORS_ONLN
40         if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
41                 return (int)ncpus;
42 #endif
43
44         return 1;
45 }