164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
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/* Copyright (C) 2015-2022 Free Software Foundation, Inc.
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Contributed by Sebastian Huber <sebastian.huber@embedded-brains.de>.
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file contains RTEMS specific routines related to counting
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online processors and dynamic load balancing. */
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#include "libgomp.h"
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#include "pool.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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struct gomp_thread_pool_reservoir **gomp_thread_pool_reservoirs;
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__thread struct gomp_tls_rtems_data gomp_tls_rtems_data;
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static void
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allocate_thread_pool_reservoirs (void)
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{
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struct gomp_thread_pool_reservoir **reservoirs;
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size_t size = _Sched_Count () * sizeof (*reservoirs);
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reservoirs = gomp_malloc (size);
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gomp_thread_pool_reservoirs = reservoirs;
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memset (reservoirs, 0, size);
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}
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static void
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allocate_thread_pool_reservoir (unsigned long count, unsigned long priority,
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unsigned long scheduler)
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{
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struct gomp_thread_pool_reservoir *res;
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struct gomp_thread_pool *pools;
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unsigned long i;
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size_t size;
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res = gomp_thread_pool_reservoirs[scheduler];
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if (res != NULL)
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gomp_fatal ("Multiple thread pool reservoir initialization");
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size = sizeof (*res) + count * (sizeof(pools) + sizeof(*pools));
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pools = gomp_malloc (size);
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memset (pools, 0, size);
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res = (struct gomp_thread_pool_reservoir *) (pools + count);
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res->index = count;
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res->priority = priority;
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gomp_sem_init (&res->available, count);
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pthread_spin_init (&res->lock, PTHREAD_PROCESS_PRIVATE);
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for (i = 0; i < count; ++i)
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res->pools[i] = &pools[i];
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gomp_thread_pool_reservoirs[scheduler] = res;
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}
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static char *
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parse_thread_pools (char *env, unsigned long *count, unsigned long *priority,
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unsigned long *scheduler)
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{
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size_t len;
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int i;
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char *end;
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if (*env == ':')
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++env;
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errno = 0;
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*count = strtoul (env, &end, 10);
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if (errno != 0 || end == env)
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gomp_fatal ("Invalid thread pool count");
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env = end;
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if (*env == '$')
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{
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++env;
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errno = 0;
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*priority = strtoul (env, &end, 10);
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if (errno != 0 || end == env)
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gomp_fatal ("Invalid thread pool priority");
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env = end;
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}
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else
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*priority = -1;
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if (*env != '@')
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gomp_fatal ("Invalid thread pool scheduler prefix");
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++env;
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len = 0;
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while (env[len] != '\0' && env[len] != ':')
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++len;
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i = _Sched_Name_to_index (env, len);
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if (i < 0)
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gomp_fatal ("Invalid thread pool scheduler");
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*scheduler = i;
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env += len;
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return env;
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}
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static void
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init_thread_pool_reservoirs (void)
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{
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char *env = getenv ("GOMP_RTEMS_THREAD_POOLS");
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if (env != NULL)
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{
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allocate_thread_pool_reservoirs ();
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while (*env != '\0')
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{
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unsigned long count;
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unsigned long priority;
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unsigned long scheduler;
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env = parse_thread_pools (env, &count, &priority, &scheduler);
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allocate_thread_pool_reservoir (count, priority, scheduler);
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}
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}
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}
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void
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gomp_init_num_threads (void)
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{
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gomp_global_icv.nthreads_var = omp_get_num_procs();
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init_thread_pool_reservoirs ();
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}
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unsigned
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gomp_dynamic_max_threads (void)
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{
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unsigned n_onln = (unsigned) omp_get_num_procs();
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unsigned nthreads_var = gomp_icv (false)->nthreads_var;
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if (n_onln > nthreads_var)
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return nthreads_var;
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else
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return n_onln;
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}
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int
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omp_get_num_procs (void)
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{
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return sysconf (_SC_NPROCESSORS_ONLN);
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}
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ialias (omp_get_num_procs)
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