repositories / deb_ffmpeg.git / blame
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|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com> | |
| 3 | * | |
| 4 | * This file is part of FFmpeg. | |
| 5 | * | |
| 6 | * FFmpeg is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU Lesser General Public | |
| 8 | * License as published by the Free Software Foundation; either | |
| 9 | * version 2.1 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * FFmpeg is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * Lesser General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU Lesser General Public | |
| 17 | * License along with FFmpeg; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 | */ | |
| 20 | ||
| 21 | #ifndef AVUTIL_ATOMIC_H | |
| 22 | #define AVUTIL_ATOMIC_H | |
| 23 | ||
| 24 | #include "config.h" | |
| 25 | ||
| 26 | #if HAVE_ATOMICS_NATIVE | |
| 27 | ||
| 28 | #if HAVE_ATOMICS_GCC | |
| 29 | #include "atomic_gcc.h" | |
| 30 | #elif HAVE_ATOMICS_WIN32 | |
| 31 | #include "atomic_win32.h" | |
| 32 | #elif HAVE_ATOMICS_SUNCC | |
| 33 | #include "atomic_suncc.h" | |
| 34 | #endif | |
| 35 | ||
| 36 | #else | |
| 37 | ||
| 38 | /** | |
| 39 | * Load the current value stored in an atomic integer. | |
| 40 | * | |
| 41 | * @param ptr atomic integer | |
| 42 | * @return the current value of the atomic integer | |
| 43 | * @note This acts as a memory barrier. | |
| 44 | */ | |
| 45 | int avpriv_atomic_int_get(volatile int *ptr); | |
| 46 | ||
| 47 | /** | |
| 48 | * Store a new value in an atomic integer. | |
| 49 | * | |
| 50 | * @param ptr atomic integer | |
| 51 | * @param val the value to store in the atomic integer | |
| 52 | * @note This acts as a memory barrier. | |
| 53 | */ | |
| 54 | void avpriv_atomic_int_set(volatile int *ptr, int val); | |
| 55 | ||
| 56 | /** | |
| 57 | * Add a value to an atomic integer. | |
| 58 | * | |
| 59 | * @param ptr atomic integer | |
| 60 | * @param inc the value to add to the atomic integer (may be negative) | |
| 61 | * @return the new value of the atomic integer. | |
| 62 | * @note This does NOT act as a memory barrier. This is primarily | |
| 63 | * intended for reference counting. | |
| 64 | */ | |
| 65 | int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc); | |
| 66 | ||
| 67 | /** | |
| 68 | * Atomic pointer compare and swap. | |
| 69 | * | |
| 70 | * @param ptr pointer to the pointer to operate on | |
| 71 | * @param oldval do the swap if the current value of *ptr equals to oldval | |
| 72 | * @param newval value to replace *ptr with | |
| 73 | * @return the value of *ptr before comparison | |
| 74 | */ | |
| 75 | void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval); | |
| 76 | ||
| 77 | #endif /* HAVE_ATOMICS_NATIVE */ | |
| 78 | ||
| 79 | #endif /* AVUTIL_ATOMIC_H */ |