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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Ronald S. Bultje |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVUTIL_ATOMIC_H |
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| 22 | #define AVUTIL_ATOMIC_H |
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| 23 | |||
| 24 | #include "config.h" |
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| 25 | |||
| 26 | #if HAVE_ATOMICS_GCC |
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| 27 | #include "atomic_gcc.h" |
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| 28 | #elif HAVE_ATOMICS_WIN32 |
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| 29 | #include "atomic_win32.h" |
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| 30 | #elif HAVE_ATOMICS_SUNCC |
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| 31 | #include "atomic_suncc.h" |
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| 32 | #else |
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| 33 | |||
| 34 | /** |
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| 35 | * Load the current value stored in an atomic integer. |
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| 36 | * |
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| 37 | * @param ptr atomic integer |
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| 38 | * @return the current value of the atomic integer |
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| 39 | * @note This acts as a memory barrier. |
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| 40 | */ |
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| 41 | int avpriv_atomic_int_get(volatile int *ptr); |
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| 42 | |||
| 43 | /** |
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| 44 | * Store a new value in an atomic integer. |
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| 45 | * |
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| 46 | * @param ptr atomic integer |
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| 47 | * @param val the value to store in the atomic integer |
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| 48 | * @note This acts as a memory barrier. |
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| 49 | */ |
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| 50 | void avpriv_atomic_int_set(volatile int *ptr, int val); |
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| 51 | |||
| 52 | /** |
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| 53 | * Add a value to an atomic integer. |
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| 54 | * |
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| 55 | * @param ptr atomic integer |
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| 56 | * @param inc the value to add to the atomic integer (may be negative) |
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| 57 | * @return the new value of the atomic integer. |
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| 58 | * @note This does NOT act as a memory barrier. This is primarily |
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| 59 | * intended for reference counting. |
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| 60 | */ |
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| 61 | int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc); |
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| 62 | |||
| 63 | /** |
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| 64 | * Atomic pointer compare and swap. |
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| 65 | * |
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| 66 | * @param ptr pointer to the pointer to operate on |
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| 67 | * @param oldval do the swap if the current value of *ptr equals to oldval |
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| 68 | * @param newval value to replace *ptr with |
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| 69 | * @return the value of *ptr before comparison |
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| 70 | */ |
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| 71 | void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval); |
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| 72 | |||
| 73 | #endif /* HAVE_MEMORYBARRIER */ |
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| 74 | #endif /* AVUTIL_ATOMIC_H */ |