/*
  * 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 */