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1 /* Copyright (C) 2005-2020 Free Software Foundation, Inc.
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111
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU Offloading and Multi Processing Library
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5 (libgomp).
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6
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7 Libgomp is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* This file contains helpers for the ATOMIC construct. */
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27
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28 #include "libgomp.h"
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29
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30 /* This mutex is used when atomic operations don't exist for the target
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31 in the mode requested. The result is not globally atomic, but works so
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32 long as all parallel references are within #pragma omp atomic directives.
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33 According to responses received from omp@openmp.org, appears to be within
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34 spec. Which makes sense, since that's how several other compilers
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35 handle this situation as well. */
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36
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37 static gomp_mutex_t atomic_lock;
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38
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39 void
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40 GOMP_atomic_start (void)
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41 {
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42 gomp_mutex_lock (&atomic_lock);
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43 }
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44
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45 void
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46 GOMP_atomic_end (void)
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47 {
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48 gomp_mutex_unlock (&atomic_lock);
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49 }
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50
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51 #if !GOMP_MUTEX_INIT_0
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52 static void __attribute__((constructor))
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53 initialize_atomic (void)
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54 {
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55 gomp_mutex_init (&atomic_lock);
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56 }
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57 #endif
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