static int
get_num_procs (void)
{
#ifdef HAVE_PTHREAD_AFFINITY_NP
if (gomp_places_list == NULL)
{
/* Count only the CPUs this process can use. */
if (gomp_cpusetp
&& pthread_getaffinity_np (pthread_self (), gomp_get_cpuset_size,
gomp_cpusetp) == 0)
{
int ret = gomp_cpuset_popcount (gomp_get_cpuset_size, gomp_cpusetp);
return ret != 0 ? ret : 1;
}
}
else
{
/* We can't use pthread_getaffinity_np in this case
(we have changed it ourselves, it binds to just one CPU).
Count instead the number of different CPUs we are
using. gomp_init_affinity updated gomp_available_cpus to
the number of CPUs in the GOMP_AFFINITY mask that we are
allowed to use though. */
return gomp_available_cpus;
}
#endif
#if defined(__ANDROID__)
return sc_nprocessors_actu ();
#elif defined(_SC_NPROCESSORS_ONLN)
return sysconf (_SC_NPROCESSORS_ONLN);
#else
return gomp_icv (false)->nthreads_var;
#endif
}
int
omp_get_place_num_procs (int place_num)
{
if (place_num < 0 || place_num >= gomp_places_list_len)
return 0;
cpu_set_t *cpusetp = (cpu_set_t *) gomp_places_list[place_num];
return gomp_cpuset_popcount (gomp_cpuset_size, cpusetp);
}
bool
gomp_affinity_finalize_place_list (bool quiet)
{
unsigned long i, j;
for (i = 0, j = 0; i < gomp_places_list_len; i++)
{
cpu_set_t *cpusetp = (cpu_set_t *) gomp_places_list[i];
bool nonempty = false;
#ifdef CPU_AND_S
CPU_AND_S (gomp_cpuset_size, cpusetp, cpusetp, gomp_cpusetp);
nonempty = gomp_cpuset_popcount (gomp_cpuset_size, cpusetp) != 0;
#else
unsigned long k, max = gomp_cpuset_size / sizeof (cpusetp->__bits[0]);
for (k = 0; k < max; k++)
if ((cpusetp->__bits[k] &= gomp_cpusetp->__bits[k]) != 0)
nonempty = true;
#endif
if (nonempty)
gomp_places_list[j++] = gomp_places_list[i];
}
if (j == 0)
{
if (!quiet)
gomp_error ("None of the places contain usable logical CPUs");
return false;
}
else if (j < gomp_places_list_len)
{
if (!quiet)
gomp_error ("Number of places reduced from %ld to %ld because some "
"places didn't contain any usable logical CPUs",
gomp_places_list_len, j);
gomp_places_list_len = j;
}
return true;
}
void
gomp_init_num_threads (void)
{
#ifdef HAVE_PTHREAD_AFFINITY_NP
#if defined (_SC_NPROCESSORS_CONF) && defined (CPU_ALLOC_SIZE)
gomp_cpuset_size = sysconf (_SC_NPROCESSORS_CONF);
gomp_cpuset_size = CPU_ALLOC_SIZE (gomp_cpuset_size);
#else
gomp_cpuset_size = sizeof (cpu_set_t);
#endif
gomp_cpusetp = (cpu_set_t *) gomp_malloc (gomp_cpuset_size);
do
{
int ret = pthread_getaffinity_np (pthread_self (), gomp_cpuset_size,
gomp_cpusetp);
if (ret == 0)
{
/* Count only the CPUs this process can use. */
gomp_global_icv.nthreads_var
= gomp_cpuset_popcount (gomp_cpuset_size, gomp_cpusetp);
if (gomp_global_icv.nthreads_var == 0)
break;
gomp_get_cpuset_size = gomp_cpuset_size;
#ifdef CPU_ALLOC_SIZE
unsigned long i;
for (i = gomp_cpuset_size * 8; i; i--)
if (CPU_ISSET_S (i - 1, gomp_cpuset_size, gomp_cpusetp))
break;
gomp_cpuset_size = CPU_ALLOC_SIZE (i);
#endif
return;
}
if (ret != EINVAL)
break;
#ifdef CPU_ALLOC_SIZE
if (gomp_cpuset_size < sizeof (cpu_set_t))
gomp_cpuset_size = sizeof (cpu_set_t);
else
gomp_cpuset_size = gomp_cpuset_size * 2;
if (gomp_cpuset_size < 8 * sizeof (cpu_set_t))
gomp_cpusetp
= (cpu_set_t *) gomp_realloc (gomp_cpusetp, gomp_cpuset_size);
else
{
/* Avoid gomp_fatal if too large memory allocation would be
requested, e.g. kernel returning EINVAL all the time. */
void *p = realloc (gomp_cpusetp, gomp_cpuset_size);
if (p == NULL)
break;
gomp_cpusetp = (cpu_set_t *) p;
}
#else
break;
#endif
}
while (1);
gomp_cpuset_size = 0;
gomp_global_icv.nthreads_var = 1;
free (gomp_cpusetp);
gomp_cpusetp = NULL;
#endif
#if defined(__ANDROID__)
gomp_global_icv.nthreads_var = sc_nprocessors_actu ();
#elif defined(_SC_NPROCESSORS_ONLN)
gomp_global_icv.nthreads_var = sysconf (_SC_NPROCESSORS_ONLN);
#endif
}
bool
gomp_affinity_init_level (int level, unsigned long count, bool quiet)
{
unsigned long i, max = 8 * gomp_cpuset_size;
if (gomp_cpusetp)
{
unsigned long maxcount
= gomp_cpuset_popcount (gomp_cpuset_size, gomp_cpusetp);
if (count > maxcount)
count = maxcount;
}
gomp_places_list = gomp_affinity_alloc (count, quiet);
gomp_places_list_len = 0;
if (gomp_places_list == NULL)
return false;
/* SMT (threads). */
if (level == 1)
{
for (i = 0; i < max && gomp_places_list_len < count; i++)
if (CPU_ISSET_S (i, gomp_cpuset_size, gomp_cpusetp))
{
gomp_affinity_init_place (gomp_places_list[gomp_places_list_len]);
gomp_affinity_add_cpus (gomp_places_list[gomp_places_list_len],
i, 1, 0, true);
++gomp_places_list_len;
}
return true;
}
else
{
char name[sizeof ("/sys/devices/system/cpu/cpu/topology/"
"thread_siblings_list") + 3 * sizeof (unsigned long)];
size_t prefix_len = sizeof ("/sys/devices/system/cpu/cpu") - 1;
cpu_set_t *copy = gomp_alloca (gomp_cpuset_size);
FILE *f;
char *line = NULL;
size_t linelen = 0;
memcpy (name, "/sys/devices/system/cpu/cpu", prefix_len);
memcpy (copy, gomp_cpusetp, gomp_cpuset_size);
for (i = 0; i < max && gomp_places_list_len < count; i++)
if (CPU_ISSET_S (i, gomp_cpuset_size, copy))
{
sprintf (name + prefix_len, "%lu/topology/%s_siblings_list",
i, level == 2 ? "thread" : "core");
f = fopen (name, "r");
if (f != NULL)
{
if (getline (&line, &linelen, f) > 0)
{
char *p = line;
bool seen_i = false;
void *pl = gomp_places_list[gomp_places_list_len];
gomp_affinity_init_place (pl);
while (*p && *p != '\n')
{
unsigned long first, last;
errno = 0;
first = strtoul (p, &p, 10);
if (errno)
break;
last = first;
if (*p == '-')
{
errno = 0;
last = strtoul (p + 1, &p, 10);
if (errno || last < first)
break;
}
for (; first <= last; first++)
if (CPU_ISSET_S (first, gomp_cpuset_size, copy)
&& gomp_affinity_add_cpus (pl, first, 1, 0,
true))
{
CPU_CLR_S (first, gomp_cpuset_size, copy);
if (first == i)
seen_i = true;
}
if (*p == ',')
++p;
}
if (seen_i)
gomp_places_list_len++;
}
fclose (f);
}
}
if (gomp_places_list_len == 0)
{
if (!quiet)
gomp_error ("Error reading %s topology",
level == 2 ? "core" : "socket");
free (gomp_places_list);
gomp_places_list = NULL;
return false;
}
return true;
}
return false;
}
