thread-utils.c

   1 #include "cache.h"
   2 #include <pthread.h>
   3
   4 #if defined(hpux) || defined(__hpux) || defined(_hpux)
   5 #  include <sys/pstat.h>
   6 #endif
   7
   8 /*
   9  * By doing this in two steps we can at least get
  10  * the function to be somewhat coherent, even
  11  * with this disgusting nest of #ifdefs.
  12  */
  13 #ifndef _SC_NPROCESSORS_ONLN
  14 #  ifdef _SC_NPROC_ONLN
  15 #    define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
  16 #  elif defined _SC_CRAY_NCPU
  17 #    define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
  18 #  endif
  19 #endif
  20
  21 int online_cpus(void)
  22 {
  23 #ifdef _SC_NPROCESSORS_ONLN
  24         long ncpus;
  25 #endif
  26
  27 #ifdef _WIN32
  28         SYSTEM_INFO info;
  29         GetSystemInfo(&info);
  30
  31         if ((int)info.dwNumberOfProcessors > 0)
  32                 return (int)info.dwNumberOfProcessors;
  33 #elif defined(hpux) || defined(__hpux) || defined(_hpux)
  34         struct pst_dynamic psd;
  35
  36         if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
  37                 return (int)psd.psd_proc_cnt;
  38 #endif
  39
  40 #ifdef _SC_NPROCESSORS_ONLN
  41         if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
  42                 return (int)ncpus;
  43 #endif
  44
  45         return 1;
  46 }
  47
  48 int init_recursive_mutex(pthread_mutex_t *m)
  49 {
  50         pthread_mutexattr_t a;
  51         int ret;
  52
  53         ret = pthread_mutexattr_init(&a);
  54         if (!ret) {
  55                 ret = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_RECURSIVE);
  56                 if (!ret)
  57                         ret = pthread_mutex_init(m, &a);
  58                 pthread_mutexattr_destroy(&a);
  59         }
  60         return ret;
  61 }