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1 /* Copyright (C) 2005, 2009 Free Software Foundation, Inc.
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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 OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This is a Linux specific implementation of a mutex synchronization
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26 mechanism for libgomp. This type is private to the library. This
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27 implementation uses atomic instructions and the futex syscall. */
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28
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29 #ifndef GOMP_MUTEX_H
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30 #define GOMP_MUTEX_H 1
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31
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32 typedef int gomp_mutex_t;
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33
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34 #define GOMP_MUTEX_INIT_0 1
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35
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36 static inline void gomp_mutex_init (gomp_mutex_t *mutex)
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37 {
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38 *mutex = 0;
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39 }
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40
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41 extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex);
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42 static inline void gomp_mutex_lock (gomp_mutex_t *mutex)
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43 {
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44 if (!__sync_bool_compare_and_swap (mutex, 0, 1))
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45 gomp_mutex_lock_slow (mutex);
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46 }
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47
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48 extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
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49 static inline void gomp_mutex_unlock (gomp_mutex_t *mutex)
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50 {
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51 int val = __sync_lock_test_and_set (mutex, 0);
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52 if (__builtin_expect (val > 1, 0))
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53 gomp_mutex_unlock_slow (mutex);
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54 }
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55
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56 static inline void gomp_mutex_destroy (gomp_mutex_t *mutex)
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57 {
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58 }
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59
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60 #endif /* GOMP_MUTEX_H */
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