| /* Copyright (C) 2005-2017 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| This file is part of the GNU Offloading and Multi Processing Library |
| (libgomp). |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This file contains helpers for the ATOMIC construct. */ |
| |
| #include "libgomp.h" |
| |
| /* This mutex is used when atomic operations don't exist for the target |
| in the mode requested. The result is not globally atomic, but works so |
| long as all parallel references are within #pragma omp atomic directives. |
| According to responses received from omp@openmp.org, appears to be within |
| spec. Which makes sense, since that's how several other compilers |
| handle this situation as well. */ |
| |
| static gomp_mutex_t atomic_lock; |
| |
| void |
| GOMP_atomic_start (void) |
| { |
| gomp_mutex_lock (&atomic_lock); |
| } |
| |
| void |
| GOMP_atomic_end (void) |
| { |
| gomp_mutex_unlock (&atomic_lock); |
| } |
| |
| #if !GOMP_MUTEX_INIT_0 |
| static void __attribute__((constructor)) |
| initialize_atomic (void) |
| { |
| gomp_mutex_init (&atomic_lock); |
| } |
| #endif |