1 /* Copyright (C) 2005-2018 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU Offloading and Multi Processing Library 5 (libgomp). 6 7 Libgomp is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* This file contains helpers for the ATOMIC construct. */ 27 28 #include "libgomp.h" 29 30 /* This mutex is used when atomic operations don't exist for the target 31 in the mode requested. The result is not globally atomic, but works so 32 long as all parallel references are within #pragma omp atomic directives. 33 According to responses received from omp@openmp.org, appears to be within 34 spec. Which makes sense, since that's how several other compilers 35 handle this situation as well. */ 36 37 static gomp_mutex_t atomic_lock; 38 39 void 40 GOMP_atomic_start (void) 41 { 42 gomp_mutex_lock (&atomic_lock); 43 } 44 45 void 46 GOMP_atomic_end (void) 47 { 48 gomp_mutex_unlock (&atomic_lock); 49 } 50 51 #if !GOMP_MUTEX_INIT_0 52 static void __attribute__((constructor)) 53 initialize_atomic (void) 54 { 55 gomp_mutex_init (&atomic_lock); 56 } 57 #endif 58