| 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 */ |