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/* Copyright (C) 2015-2019 Free Software Foundation, Inc.
Contributed by Sebastian Huber <>.
This file is part of the GNU Offloading and Multi Processing Library
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<>. */
/* This file contains RTEMS specific routines related to counting
online processors and dynamic load balancing. */
#include "libgomp.h"
#include "pool.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct gomp_thread_pool_reservoir **gomp_thread_pool_reservoirs;
__thread struct gomp_tls_rtems_data gomp_tls_rtems_data;
static void
allocate_thread_pool_reservoirs (void)
struct gomp_thread_pool_reservoir **reservoirs;
size_t size = _Sched_Count () * sizeof (*reservoirs);
reservoirs = gomp_malloc (size);
gomp_thread_pool_reservoirs = reservoirs;
memset (reservoirs, 0, size);
static void
allocate_thread_pool_reservoir (unsigned long count, unsigned long priority,
unsigned long scheduler)
struct gomp_thread_pool_reservoir *res;
struct gomp_thread_pool *pools;
unsigned long i;
size_t size;
res = gomp_thread_pool_reservoirs[scheduler];
if (res != NULL)
gomp_fatal ("Multiple thread pool reservoir initialization");
size = sizeof (*res) + count * (sizeof(pools) + sizeof(*pools));
pools = gomp_malloc (size);
memset (pools, 0, size);
res = (struct gomp_thread_pool_reservoir *) (pools + count);
res->index = count;
res->priority = priority;
gomp_sem_init (&res->available, count);
pthread_spin_init (&res->lock, PTHREAD_PROCESS_PRIVATE);
for (i = 0; i < count; ++i)
res->pools[i] = &pools[i];
gomp_thread_pool_reservoirs[scheduler] = res;
static char *
parse_thread_pools (char *env, unsigned long *count, unsigned long *priority,
unsigned long *scheduler)
size_t len;
int i;
if (*env == ':')
errno = 0;
*count = strtoul (env, &env, 10);
if (errno != 0)
gomp_fatal ("Invalid thread pool count");
if (*env == '$')
errno = 0;
*priority = strtoul (env, &env, 10);
if (errno != 0)
gomp_fatal ("Invalid thread pool priority");
*priority = -1;
if (*env != '@')
gomp_fatal ("Invalid thread pool scheduler prefix");
len = 0;
while (env[len] != '\0' && env[len] != ':')
i = _Sched_Name_to_index (env, len);
if (i < 0)
gomp_fatal ("Invalid thread pool scheduler");
*scheduler = i;
env += len;
return env;
static void
init_thread_pool_reservoirs (void)
char *env = getenv ("GOMP_RTEMS_THREAD_POOLS");
if (env != NULL)
allocate_thread_pool_reservoirs ();
while (*env != '\0')
unsigned long count;
unsigned long priority;
unsigned long scheduler;
env = parse_thread_pools (env, &count, &priority, &scheduler);
allocate_thread_pool_reservoir (count, priority, scheduler);
gomp_init_num_threads (void)
gomp_global_icv.nthreads_var = omp_get_num_procs();
init_thread_pool_reservoirs ();
gomp_dynamic_max_threads (void)
unsigned n_onln = (unsigned) omp_get_num_procs();
unsigned nthreads_var = gomp_icv (false)->nthreads_var;
if (n_onln > nthreads_var)
return nthreads_var;
return n_onln;
omp_get_num_procs (void)
return sysconf (_SC_NPROCESSORS_ONLN);
ialias (omp_get_num_procs)