/* * 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 */