diff options
Diffstat (limited to 'libgomp/config')
-rw-r--r-- | libgomp/config/linux/affinity.c | 107 | ||||
-rw-r--r-- | libgomp/config/posix/affinity.c | 41 |
2 files changed, 148 insertions, 0 deletions
diff --git a/libgomp/config/linux/affinity.c b/libgomp/config/linux/affinity.c new file mode 100644 index 0000000..8fcce5f --- /dev/null +++ b/libgomp/config/linux/affinity.c @@ -0,0 +1,107 @@ +/* Copyright (C) 2006, 2007 Free Software Foundation, Inc. + Contributed by Jakub Jelinek <jakub@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for + more details. + + You should have received a copy of the GNU Lesser General Public License + along with libgomp; see the file COPYING.LIB. If not, write to the + Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + MA 02110-1301, USA. */ + +/* As a special exception, if you link this library with other files, some + of which are compiled with GCC, to produce an executable, this library + does not by itself cause the resulting executable to be covered by the + GNU General Public License. This exception does not however invalidate + any other reasons why the executable file might be covered by the GNU + General Public License. */ + +/* This is a Linux specific implementation of a CPU affinity setting. */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE 1 +#endif +#include "libgomp.h" +#include <sched.h> +#include <stdlib.h> +#include <unistd.h> + +#ifdef HAVE_PTHREAD_AFFINITY_NP + +static unsigned int affinity_counter; +#ifndef HAVE_SYNC_BUILTINS +static gomp_mutex_t affinity_lock; +#endif + +void +gomp_init_affinity (void) +{ + cpu_set_t cpuset; + size_t idx, widx; + + if (pthread_getaffinity_np (pthread_self (), sizeof (cpuset), &cpuset)) + { + gomp_error ("could not get CPU affinity set"); + free (gomp_cpu_affinity); + gomp_cpu_affinity = NULL; + gomp_cpu_affinity_len = 0; + return; + } + + for (widx = idx = 0; idx < gomp_cpu_affinity_len; idx++) + if (gomp_cpu_affinity[idx] < CPU_SETSIZE + && CPU_ISSET (gomp_cpu_affinity[idx], &cpuset)) + gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx]; + + if (widx == 0) + { + gomp_error ("no CPUs left for affinity setting"); + free (gomp_cpu_affinity); + gomp_cpu_affinity = NULL; + gomp_cpu_affinity_len = 0; + return; + } + + gomp_cpu_affinity_len = widx; + CPU_ZERO (&cpuset); + CPU_SET (gomp_cpu_affinity[0], &cpuset); + pthread_setaffinity_np (pthread_self (), sizeof (cpuset), &cpuset); + affinity_counter = 1; +#ifndef HAVE_SYNC_BUILTINS + gomp_mutex_init (&affinity_lock); +#endif +} + +void +gomp_init_thread_affinity (pthread_attr_t *attr) +{ + unsigned int cpu; + cpu_set_t cpuset; + +#ifdef HAVE_SYNC_BUILTINS + cpu = __sync_fetch_and_add (&affinity_counter, 1); +#else + gomp_mutex_lock (&affinity_lock); + cpu = affinity_counter++; + gomp_mutex_unlock (&affinity_lock); +#endif + cpu %= gomp_cpu_affinity_len; + CPU_ZERO (&cpuset); + CPU_SET (gomp_cpu_affinity[cpu], &cpuset); + pthread_attr_setaffinity_np (attr, sizeof (cpu_set_t), &cpuset); +} + +#else + +#include "../posix/affinity.c" + +#endif diff --git a/libgomp/config/posix/affinity.c b/libgomp/config/posix/affinity.c new file mode 100644 index 0000000..67cb37a --- /dev/null +++ b/libgomp/config/posix/affinity.c @@ -0,0 +1,41 @@ +/* Copyright (C) 2006 Free Software Foundation, Inc. + Contributed by Jakub Jelinek <jakub@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for + more details. + + You should have received a copy of the GNU Lesser General Public License + along with libgomp; see the file COPYING.LIB. If not, write to the + Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + MA 02110-1301, USA. */ + +/* As a special exception, if you link this library with other files, some + of which are compiled with GCC, to produce an executable, this library + does not by itself cause the resulting executable to be covered by the + GNU General Public License. This exception does not however invalidate + any other reasons why the executable file might be covered by the GNU + General Public License. */ + +/* This is a generic stub implementation of a CPU affinity setting. */ + +#include "libgomp.h" + +void +gomp_init_affinity (void) +{ +} + +void +gomp_init_thread_affinity (pthread_attr_t *attr) +{ + (void) attr; +} |