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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 semaphore 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_SEM_H
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30 #define GOMP_SEM_H 1
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31
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32 typedef int gomp_sem_t;
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33
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34 static inline void gomp_sem_init (gomp_sem_t *sem, int value)
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35 {
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36 *sem = value;
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37 }
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38
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39 extern void gomp_sem_wait_slow (gomp_sem_t *);
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40 static inline void gomp_sem_wait (gomp_sem_t *sem)
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41 {
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42 if (!__sync_bool_compare_and_swap (sem, 1, 0))
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43 gomp_sem_wait_slow (sem);
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44 }
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45
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46 extern void gomp_sem_post_slow (gomp_sem_t *);
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47 static inline void gomp_sem_post (gomp_sem_t *sem)
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48 {
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49 if (!__sync_bool_compare_and_swap (sem, 0, 1))
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50 gomp_sem_post_slow (sem);
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51 }
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52
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53 static inline void gomp_sem_destroy (gomp_sem_t *sem)
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54 {
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55 }
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56
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57 #endif /* GOMP_SEM_H */
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