1 /*
2 * Copyright © 2018, VideoLAN and dav1d authors
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef MSCVER_STDATOMIC_H_
28 #define MSCVER_STDATOMIC_H_
29
30 #if !defined(__cplusplus) && defined(_MSC_VER)
31
32 #pragma warning(push)
33 #pragma warning(disable:4067) /* newline for __has_include_next */
34
35 #if defined(__clang__) && __has_include_next(<stdatomic.h>)
36 /* use the clang stdatomic.h with clang-cl*/
37 # include_next <stdatomic.h>
38 #else /* ! stdatomic.h */
39
40 #include <windows.h>
41
42 #include "common/attributes.h"
43
44 typedef volatile LONG atomic_int;
45 typedef volatile ULONG atomic_uint;
46
47 typedef enum {
48 memory_order_relaxed,
49 memory_order_acquire
50 } msvc_atomic_memory_order;
51
52 #define atomic_init(p_a, v) do { *(p_a) = (v); } while(0)
53 #define atomic_store(p_a, v) InterlockedExchange((LONG*)p_a, v)
54 #define atomic_load(p_a) InterlockedCompareExchange((LONG*)p_a, 0, 0)
55 #define atomic_exchange(p_a, v) InterlockedExchange(p_a, v)
56 #define atomic_load_explicit(p_a, mo) atomic_load(p_a)
57
atomic_compare_exchange_strong_int(LONG * obj,LONG * expected,LONG desired)58 static inline int atomic_compare_exchange_strong_int(LONG *obj, LONG *expected,
59 LONG desired)
60 {
61 LONG orig = *expected;
62 *expected = InterlockedCompareExchange(obj, desired, orig);
63 return *expected == orig;
64 }
65 #define atomic_compare_exchange_strong(p_a, expected, desired) atomic_compare_exchange_strong_int((LONG *)p_a, (LONG *)expected, (LONG)desired)
66
67 /*
68 * TODO use a special call to increment/decrement
69 * using InterlockedIncrement/InterlockedDecrement
70 */
71 #define atomic_fetch_add(p_a, inc) InterlockedExchangeAdd(p_a, inc)
72 #define atomic_fetch_sub(p_a, dec) InterlockedExchangeAdd(p_a, -(dec))
73 #define atomic_fetch_or(p_a, v) InterlockedOr(p_a, v)
74 #define atomic_fetch_add_explicit(p_a, inc, mo) atomic_fetch_add(p_a, inc)
75
76 #endif /* ! stdatomic.h */
77
78 #pragma warning(pop)
79
80 #endif /* !defined(__cplusplus) && defined(_MSC_VER) */
81
82 #endif /* MSCVER_STDATOMIC_H_ */
83