thread-utils.c

   1 #include "git-compat-util.h"
   2 #include "thread-utils.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 NO_PTHREADS
  24         return 1;
  25 #else
  26 #ifdef _SC_NPROCESSORS_ONLN
  27         long ncpus;
  28 #endif
  29
  30 #ifdef GIT_WINDOWS_NATIVE
  31         SYSTEM_INFO info;
  32         GetSystemInfo(&info);
  33
  34         if ((int)info.dwNumberOfProcessors > 0)
  35                 return (int)info.dwNumberOfProcessors;
  36 #elif defined(hpux) || defined(__hpux) || defined(_hpux)
  37         struct pst_dynamic psd;
  38
  39         if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
  40                 return (int)psd.psd_proc_cnt;
  41 #elif defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU)
  42         int mib[2];
  43         size_t len;
  44         int cpucount;
  45
  46         mib[0] = CTL_HW;
  47 #  ifdef HW_AVAILCPU
  48         mib[1] = HW_AVAILCPU;
  49         len = sizeof(cpucount);
  50         if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
  51                 return cpucount;
  52 #  endif /* HW_AVAILCPU */
  53         mib[1] = HW_NCPU;
  54         len = sizeof(cpucount);
  55         if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
  56                 return cpucount;
  57 #endif /* defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU) */
  58
  59 #ifdef _SC_NPROCESSORS_ONLN
  60         if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
  61                 return (int)ncpus;
  62 #endif
  63
  64         return 1;
  65 #endif
  66 }
  67
  68 int init_recursive_mutex(pthread_mutex_t *m)
  69 {
  70 #ifndef NO_PTHREADS
  71         pthread_mutexattr_t a;
  72         int ret;
  73
  74         ret = pthread_mutexattr_init(&a);
  75         if (!ret) {
  76                 ret = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_RECURSIVE);
  77                 if (!ret)
  78                         ret = pthread_mutex_init(m, &a);
  79                 pthread_mutexattr_destroy(&a);
  80         }
  81         return ret;
  82 #else
  83         return 0;
  84 #endif
  85 }
  86
  87 #ifdef NO_PTHREADS
  88 int dummy_pthread_create(pthread_t *pthread, const void *attr,
  89                          void *(*fn)(void *), void *data)
  90 {
  91         /*
  92          * Do nothing.
  93          *
  94          * The main purpose of this function is to break compiler's
  95          * flow analysis and avoid -Wunused-variable false warnings.
  96          */
  97         return ENOSYS;
  98 }
  99
 100 int dummy_pthread_init(void *data)
 101 {
 102         /*
 103          * Do nothing.
 104          *
 105          * The main purpose of this function is to break compiler's
 106          * flow analysis or it may realize that functions like
 107          * pthread_mutex_init() is no-op, which means the (static)
 108          * variable is not used/initialized at all and trigger
 109          * -Wunused-variable
 110          */
 111         return ENOSYS;
 112 }
 113
 114 int dummy_pthread_join(pthread_t pthread, void **retval)
 115 {
 116         /*
 117          * Do nothing.
 118          *
 119          * The main purpose of this function is to break compiler's
 120          * flow analysis and avoid -Wunused-variable false warnings.
 121          */
 122         return ENOSYS;
 123 }
 124
 125 #endif