stdatomic.h (3237B)
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 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_ */