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74 lines
2.3 KiB
74 lines
2.3 KiB
/* |
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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_SYNC_VAL_COMPARE_AND_SWAP |
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#include "atomic_gcc.h" |
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#elif HAVE_MEMORYBARRIER |
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#include "atomic_win32.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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