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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_MEMORYBARRIER
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#include "atomic_win32.h"
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#elif HAVE_SYNC_SYNCHRONIZE
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#include "atomic_gcc.h"
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#elif HAVE_MACHINE_RW_BARRIER
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#include "atomic_suncc.h"
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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_MEMORYBARRIER */
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#endif /* AVUTIL_ATOMIC_H */
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