| /* |
| * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVUTIL_ATOMIC_GCC_H |
| #define AVUTIL_ATOMIC_GCC_H |
| |
| #include <stdint.h> |
| |
| #include "atomic.h" |
| |
| #define avpriv_atomic_int_get atomic_int_get_gcc |
| static inline int atomic_int_get_gcc(volatile int *ptr) |
| { |
| #if HAVE_ATOMIC_COMPARE_EXCHANGE |
| return __atomic_load_n(ptr, __ATOMIC_SEQ_CST); |
| #else |
| __sync_synchronize(); |
| return *ptr; |
| #endif |
| } |
| |
| #define avpriv_atomic_int_set atomic_int_set_gcc |
| static inline void atomic_int_set_gcc(volatile int *ptr, int val) |
| { |
| #if HAVE_ATOMIC_COMPARE_EXCHANGE |
| __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST); |
| #else |
| *ptr = val; |
| __sync_synchronize(); |
| #endif |
| } |
| |
| #define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_gcc |
| static inline int atomic_int_add_and_fetch_gcc(volatile int *ptr, int inc) |
| { |
| #if HAVE_ATOMIC_COMPARE_EXCHANGE |
| return __atomic_add_fetch(ptr, inc, __ATOMIC_SEQ_CST); |
| #else |
| return __sync_add_and_fetch(ptr, inc); |
| #endif |
| } |
| |
| #define avpriv_atomic_ptr_cas atomic_ptr_cas_gcc |
| static inline void *atomic_ptr_cas_gcc(void * volatile *ptr, |
| void *oldval, void *newval) |
| { |
| #if HAVE_SYNC_VAL_COMPARE_AND_SWAP |
| #ifdef __ARMCC_VERSION |
| // armcc will throw an error if ptr is not an integer type |
| volatile uintptr_t *tmp = (volatile uintptr_t*)ptr; |
| return (void*)__sync_val_compare_and_swap(tmp, oldval, newval); |
| #else |
| return __sync_val_compare_and_swap(ptr, oldval, newval); |
| #endif |
| #else |
| __atomic_compare_exchange_n(ptr, &oldval, newval, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); |
| return oldval; |
| #endif |
| } |
| |
| #endif /* AVUTIL_ATOMIC_GCC_H */ |