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  1. /*
  2.  * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVUTIL_ATOMIC_GCC_H
  22. #define AVUTIL_ATOMIC_GCC_H
  23.  
  24. #include <stdint.h>
  25.  
  26. #include "atomic.h"
  27.  
  28. #define avpriv_atomic_int_get atomic_int_get_gcc
  29. static inline int atomic_int_get_gcc(volatile int *ptr)
  30. {
  31. #if HAVE_ATOMIC_COMPARE_EXCHANGE
  32.     return __atomic_load_n(ptr, __ATOMIC_SEQ_CST);
  33. #else
  34.     __sync_synchronize();
  35.     return *ptr;
  36. #endif
  37. }
  38.  
  39. #define avpriv_atomic_int_set atomic_int_set_gcc
  40. static inline void atomic_int_set_gcc(volatile int *ptr, int val)
  41. {
  42. #if HAVE_ATOMIC_COMPARE_EXCHANGE
  43.     __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST);
  44. #else
  45.     *ptr = val;
  46.     __sync_synchronize();
  47. #endif
  48. }
  49.  
  50. #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc
  51. static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc)
  52. {
  53. #if HAVE_ATOMIC_COMPARE_EXCHANGE
  54.     return __atomic_add_fetch(ptr, inc, __ATOMIC_SEQ_CST);
  55. #else
  56.     return __sync_add_and_fetch(ptr, inc);
  57. #endif
  58. }
  59.  
  60. #define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc
  61. static inline void *atomic_ptr_cas_gcc(void * volatile *ptr,
  62.                                        void *oldval, void *newval)
  63. {
  64. #if HAVE_SYNC_VAL_COMPARE_AND_SWAP
  65. #ifdef __ARMCC_VERSION
  66.     // armcc will throw an error if ptr is not an integer type
  67.     volatile uintptr_t *tmp = (volatile uintptr_t*)ptr;
  68.     return (void*)__sync_val_compare_and_swap(tmp, oldval, newval);
  69. #else
  70.     return __sync_val_compare_and_swap(ptr, oldval, newval);
  71. #endif
  72. #else
  73.     __atomic_compare_exchange_n(ptr, &oldval, newval, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
  74.     return oldval;
  75. #endif
  76. }
  77.  
  78. #endif /* AVUTIL_ATOMIC_GCC_H */
  79.