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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 */ |