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libavutil
atomic.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_ATOMIC_H
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#define AVUTIL_ATOMIC_H
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#include "config.h"
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#if HAVE_ATOMICS_NATIVE
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#if HAVE_ATOMICS_GCC
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#include "
atomic_gcc.h
"
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#elif HAVE_ATOMICS_WIN32
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#include "
atomic_win32.h
"
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#elif HAVE_ATOMICS_SUNCC
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#include "
atomic_suncc.h
"
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#endif
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#else
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/**
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* Load the current value stored in an atomic integer.
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*
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* @param ptr atomic integer
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* @return the current value of the atomic integer
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* @note This acts as a memory barrier.
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*/
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int
avpriv_atomic_int_get
(
volatile
int
*ptr);
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/**
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* Store a new value in an atomic integer.
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*
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* @param ptr atomic integer
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* @param val the value to store in the atomic integer
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* @note This acts as a memory barrier.
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*/
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void
avpriv_atomic_int_set
(
volatile
int
*ptr,
int
val
);
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/**
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* Add a value to an atomic integer.
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*
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* @param ptr atomic integer
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* @param inc the value to add to the atomic integer (may be negative)
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* @return the new value of the atomic integer.
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* @note This does NOT act as a memory barrier. This is primarily
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* intended for reference counting.
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*/
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int
avpriv_atomic_int_add_and_fetch
(
volatile
int
*ptr,
int
inc);
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/**
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* Atomic pointer compare and swap.
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*
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* @param ptr pointer to the pointer to operate on
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* @param oldval do the swap if the current value of *ptr equals to oldval
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* @param newval value to replace *ptr with
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* @return the value of *ptr before comparison
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*/
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void
*
avpriv_atomic_ptr_cas
(
void
*
volatile
*ptr,
void
*oldval,
void
*newval);
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#endif
/* HAVE_ATOMICS_NATIVE */
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#endif
/* AVUTIL_ATOMIC_H */
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