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1 /*
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2 * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVUTIL_ATOMIC_GCC_H
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22 #define AVUTIL_ATOMIC_GCC_H
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23
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24 #include <stdint.h>
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25
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26 #include "atomic.h"
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27
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28 #define avpriv_atomic_int_get atomic_int_get_gcc
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29 static inline int atomic_int_get_gcc(volatile int *ptr)
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30 {
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31 #if HAVE_ATOMIC_COMPARE_EXCHANGE
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32 return __atomic_load_n(ptr, __ATOMIC_SEQ_CST);
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33 #else
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34 __sync_synchronize();
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35 return *ptr;
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36 #endif
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37 }
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38
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39 #define avpriv_atomic_int_set atomic_int_set_gcc
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40 static inline void atomic_int_set_gcc(volatile int *ptr, int val)
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41 {
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42 #if HAVE_ATOMIC_COMPARE_EXCHANGE
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43 __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST);
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44 #else
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45 *ptr = val;
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46 __sync_synchronize();
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47 #endif
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48 }
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49
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50 #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc
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51 static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
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52 {
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53 #if HAVE_ATOMIC_COMPARE_EXCHANGE
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54 return __atomic_add_fetch(ptr, inc, __ATOMIC_SEQ_CST);
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55 #else
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56 return __sync_add_and_fetch(ptr, inc);
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57 #endif
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58 }
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59
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60 #define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc
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61 static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
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62 void *oldval, void *newval)
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63 {
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64 #if HAVE_SYNC_VAL_COMPARE_AND_SWAP
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65 #ifdef __ARMCC_VERSION
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66 // armcc will throw an error if ptr is not an integer type
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67 volatile uintptr_t *tmp = (volatile uintptr_t*)ptr;
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68 return (void*)__sync_val_compare_and_swap(tmp, oldval, newval);
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69 #else
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70 return __sync_val_compare_and_swap(ptr, oldval, newval);
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71 #endif
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72 #else
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73 __atomic_compare_exchange_n(ptr, &oldval, newval, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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74 return oldval;
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75 #endif
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76 }
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77
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78 #endif /* AVUTIL_ATOMIC_GCC_H */
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