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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4921 | Serge | 1 | /*- |
| 2 | * Copyright (c) 2011 Ed Schouten |
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| 3 | * David Chisnall |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * 1. Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * |
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| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 25 | * SUCH DAMAGE. |
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| 26 | * |
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| 27 | * $FreeBSD$ |
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| 28 | */ |
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| 29 | |||
| 30 | #ifndef _STDATOMIC_H_ |
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| 31 | #define _STDATOMIC_H_ |
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| 32 | |||
| 33 | #include |
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| 34 | #include |
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| 35 | |||
| 36 | #if __has_extension(c_atomic) || __has_extension(cxx_atomic) |
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| 37 | #define __CLANG_ATOMICS |
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| 38 | #elif __GNUC_PREREQ__(4, 7) |
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| 39 | #define __GNUC_ATOMICS |
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| 40 | #elif defined(__GNUC__) |
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| 41 | #define __SYNC_ATOMICS |
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| 42 | #else |
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| 43 | #error "stdatomic.h does not support your compiler" |
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| 44 | #endif |
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| 45 | |||
| 46 | /* |
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| 47 | * 7.17.1 Atomic lock-free macros. |
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| 48 | */ |
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| 49 | |||
| 50 | #ifdef __GCC_ATOMIC_BOOL_LOCK_FREE |
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| 51 | #define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE |
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| 52 | #endif |
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| 53 | #ifdef __GCC_ATOMIC_CHAR_LOCK_FREE |
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| 54 | #define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE |
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| 55 | #endif |
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| 56 | #ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
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| 57 | #define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
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| 58 | #endif |
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| 59 | #ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
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| 60 | #define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
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| 61 | #endif |
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| 62 | #ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
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| 63 | #define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
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| 64 | #endif |
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| 65 | #ifdef __GCC_ATOMIC_SHORT_LOCK_FREE |
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| 66 | #define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE |
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| 67 | #endif |
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| 68 | #ifdef __GCC_ATOMIC_INT_LOCK_FREE |
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| 69 | #define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE |
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| 70 | #endif |
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| 71 | #ifdef __GCC_ATOMIC_LONG_LOCK_FREE |
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| 72 | #define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE |
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| 73 | #endif |
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| 74 | #ifdef __GCC_ATOMIC_LLONG_LOCK_FREE |
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| 75 | #define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE |
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| 76 | #endif |
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| 77 | #ifdef __GCC_ATOMIC_POINTER_LOCK_FREE |
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| 78 | #define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE |
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| 79 | #endif |
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| 80 | |||
| 81 | /* |
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| 82 | * 7.17.2 Initialization. |
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| 83 | */ |
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| 84 | |||
| 85 | #if defined(__CLANG_ATOMICS) |
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| 86 | #define ATOMIC_VAR_INIT(value) (value) |
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| 87 | #define atomic_init(obj, value) __c11_atomic_init(obj, value) |
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| 88 | #else |
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| 89 | #define ATOMIC_VAR_INIT(value) { .__val = (value) } |
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| 90 | #define atomic_init(obj, value) ((void)((obj)->__val = (value))) |
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| 91 | #endif |
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| 92 | |||
| 93 | /* |
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| 94 | * Clang and recent GCC both provide predefined macros for the memory |
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| 95 | * orderings. If we are using a compiler that doesn't define them, use the |
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| 96 | * clang values - these will be ignored in the fallback path. |
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| 97 | */ |
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| 98 | |||
| 99 | #ifndef __ATOMIC_RELAXED |
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| 100 | #define __ATOMIC_RELAXED 0 |
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| 101 | #endif |
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| 102 | #ifndef __ATOMIC_CONSUME |
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| 103 | #define __ATOMIC_CONSUME 1 |
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| 104 | #endif |
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| 105 | #ifndef __ATOMIC_ACQUIRE |
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| 106 | #define __ATOMIC_ACQUIRE 2 |
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| 107 | #endif |
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| 108 | #ifndef __ATOMIC_RELEASE |
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| 109 | #define __ATOMIC_RELEASE 3 |
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| 110 | #endif |
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| 111 | #ifndef __ATOMIC_ACQ_REL |
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| 112 | #define __ATOMIC_ACQ_REL 4 |
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| 113 | #endif |
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| 114 | #ifndef __ATOMIC_SEQ_CST |
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| 115 | #define __ATOMIC_SEQ_CST 5 |
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| 116 | #endif |
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| 117 | |||
| 118 | /* |
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| 119 | * 7.17.3 Order and consistency. |
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| 120 | * |
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| 121 | * The memory_order_* constants that denote the barrier behaviour of the |
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| 122 | * atomic operations. |
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| 123 | */ |
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| 124 | |||
| 125 | typedef enum { |
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| 126 | memory_order_relaxed = __ATOMIC_RELAXED, |
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| 127 | memory_order_consume = __ATOMIC_CONSUME, |
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| 128 | memory_order_acquire = __ATOMIC_ACQUIRE, |
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| 129 | memory_order_release = __ATOMIC_RELEASE, |
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| 130 | memory_order_acq_rel = __ATOMIC_ACQ_REL, |
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| 131 | memory_order_seq_cst = __ATOMIC_SEQ_CST |
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| 132 | } memory_order; |
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| 133 | |||
| 134 | /* |
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| 135 | * 7.17.4 Fences. |
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| 136 | */ |
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| 137 | |||
| 138 | static __inline void |
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| 139 | atomic_thread_fence(memory_order __order __unused) |
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| 140 | { |
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| 141 | |||
| 142 | #ifdef __CLANG_ATOMICS |
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| 143 | __c11_atomic_thread_fence(__order); |
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| 144 | #elif defined(__GNUC_ATOMICS) |
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| 145 | __atomic_thread_fence(__order); |
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| 146 | #else |
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| 147 | __sync_synchronize(); |
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| 148 | #endif |
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| 149 | } |
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| 150 | |||
| 151 | static __inline void |
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| 152 | atomic_signal_fence(memory_order __order __unused) |
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| 153 | { |
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| 154 | |||
| 155 | #ifdef __CLANG_ATOMICS |
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| 156 | __c11_atomic_signal_fence(__order); |
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| 157 | #elif defined(__GNUC_ATOMICS) |
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| 158 | __atomic_signal_fence(__order); |
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| 159 | #else |
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| 160 | __asm volatile ("" ::: "memory"); |
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| 161 | #endif |
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| 162 | } |
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| 163 | |||
| 164 | /* |
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| 165 | * 7.17.5 Lock-free property. |
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| 166 | */ |
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| 167 | |||
| 168 | #if defined(_KERNEL) |
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| 169 | /* Atomics in kernelspace are always lock-free. */ |
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| 170 | #define atomic_is_lock_free(obj) \ |
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| 171 | ((void)(obj), (_Bool)1) |
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| 172 | #elif defined(__CLANG_ATOMICS) |
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| 173 | #define atomic_is_lock_free(obj) \ |
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| 174 | __atomic_is_lock_free(sizeof(*(obj)), obj) |
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| 175 | #elif defined(__GNUC_ATOMICS) |
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| 176 | #define atomic_is_lock_free(obj) \ |
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| 177 | __atomic_is_lock_free(sizeof((obj)->__val), &(obj)->__val) |
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| 178 | #else |
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| 179 | #define atomic_is_lock_free(obj) \ |
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| 180 | ((void)(obj), sizeof((obj)->__val) <= sizeof(void *)) |
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| 181 | #endif |
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| 182 | |||
| 183 | /* |
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| 184 | * 7.17.6 Atomic integer types. |
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| 185 | */ |
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| 186 | |||
| 187 | typedef _Atomic(_Bool) atomic_bool; |
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| 188 | typedef _Atomic(char) atomic_char; |
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| 189 | typedef _Atomic(signed char) atomic_schar; |
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| 190 | typedef _Atomic(unsigned char) atomic_uchar; |
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| 191 | typedef _Atomic(short) atomic_short; |
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| 192 | typedef _Atomic(unsigned short) atomic_ushort; |
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| 193 | typedef _Atomic(int) atomic_int; |
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| 194 | typedef _Atomic(unsigned int) atomic_uint; |
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| 195 | typedef _Atomic(long) atomic_long; |
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| 196 | typedef _Atomic(unsigned long) atomic_ulong; |
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| 197 | typedef _Atomic(long long) atomic_llong; |
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| 198 | typedef _Atomic(unsigned long long) atomic_ullong; |
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| 199 | #if 0 |
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| 200 | typedef _Atomic(__char16_t) atomic_char16_t; |
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| 201 | typedef _Atomic(__char32_t) atomic_char32_t; |
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| 202 | #endif |
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| 203 | typedef _Atomic(wchar_t) atomic_wchar_t; |
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| 204 | typedef _Atomic(int_least8_t) atomic_int_least8_t; |
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| 205 | typedef _Atomic(uint_least8_t) atomic_uint_least8_t; |
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| 206 | typedef _Atomic(int_least16_t) atomic_int_least16_t; |
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| 207 | typedef _Atomic(uint_least16_t) atomic_uint_least16_t; |
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| 208 | typedef _Atomic(int_least32_t) atomic_int_least32_t; |
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| 209 | typedef _Atomic(uint_least32_t) atomic_uint_least32_t; |
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| 210 | typedef _Atomic(int_least64_t) atomic_int_least64_t; |
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| 211 | typedef _Atomic(uint_least64_t) atomic_uint_least64_t; |
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| 212 | typedef _Atomic(int_fast8_t) atomic_int_fast8_t; |
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| 213 | typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; |
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| 214 | typedef _Atomic(int_fast16_t) atomic_int_fast16_t; |
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| 215 | typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; |
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| 216 | typedef _Atomic(int_fast32_t) atomic_int_fast32_t; |
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| 217 | typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; |
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| 218 | typedef _Atomic(int_fast64_t) atomic_int_fast64_t; |
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| 219 | typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; |
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| 220 | typedef _Atomic(intptr_t) atomic_intptr_t; |
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| 221 | typedef _Atomic(uintptr_t) atomic_uintptr_t; |
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| 222 | typedef _Atomic(size_t) atomic_size_t; |
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| 223 | typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; |
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| 224 | typedef _Atomic(intmax_t) atomic_intmax_t; |
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| 225 | typedef _Atomic(uintmax_t) atomic_uintmax_t; |
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| 226 | |||
| 227 | /* |
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| 228 | * 7.17.7 Operations on atomic types. |
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| 229 | */ |
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| 230 | |||
| 231 | /* |
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| 232 | * Compiler-specific operations. |
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| 233 | */ |
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| 234 | |||
| 235 | #if defined(__CLANG_ATOMICS) |
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| 236 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
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| 237 | desired, success, failure) \ |
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| 238 | __c11_atomic_compare_exchange_strong(object, expected, desired, \ |
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| 239 | success, failure) |
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| 240 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
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| 241 | desired, success, failure) \ |
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| 242 | __c11_atomic_compare_exchange_weak(object, expected, desired, \ |
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| 243 | success, failure) |
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| 244 | #define atomic_exchange_explicit(object, desired, order) \ |
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| 245 | __c11_atomic_exchange(object, desired, order) |
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| 246 | #define atomic_fetch_add_explicit(object, operand, order) \ |
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| 247 | __c11_atomic_fetch_add(object, operand, order) |
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| 248 | #define atomic_fetch_and_explicit(object, operand, order) \ |
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| 249 | __c11_atomic_fetch_and(object, operand, order) |
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| 250 | #define atomic_fetch_or_explicit(object, operand, order) \ |
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| 251 | __c11_atomic_fetch_or(object, operand, order) |
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| 252 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
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| 253 | __c11_atomic_fetch_sub(object, operand, order) |
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| 254 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
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| 255 | __c11_atomic_fetch_xor(object, operand, order) |
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| 256 | #define atomic_load_explicit(object, order) \ |
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| 257 | __c11_atomic_load(object, order) |
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| 258 | #define atomic_store_explicit(object, desired, order) \ |
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| 259 | __c11_atomic_store(object, desired, order) |
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| 260 | #elif defined(__GNUC_ATOMICS) |
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| 261 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
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| 262 | desired, success, failure) \ |
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| 263 | __atomic_compare_exchange_n(&(object)->__val, expected, \ |
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| 264 | desired, 0, success, failure) |
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| 265 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
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| 266 | desired, success, failure) \ |
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| 267 | __atomic_compare_exchange_n(&(object)->__val, expected, \ |
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| 268 | desired, 1, success, failure) |
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| 269 | #define atomic_exchange_explicit(object, desired, order) \ |
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| 270 | __atomic_exchange_n(&(object)->__val, desired, order) |
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| 271 | #define atomic_fetch_add_explicit(object, operand, order) \ |
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| 272 | __atomic_fetch_add(&(object)->__val, operand, order) |
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| 273 | #define atomic_fetch_and_explicit(object, operand, order) \ |
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| 274 | __atomic_fetch_and(&(object)->__val, operand, order) |
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| 275 | #define atomic_fetch_or_explicit(object, operand, order) \ |
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| 276 | __atomic_fetch_or(&(object)->__val, operand, order) |
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| 277 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
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| 278 | __atomic_fetch_sub(&(object)->__val, operand, order) |
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| 279 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
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| 280 | __atomic_fetch_xor(&(object)->__val, operand, order) |
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| 281 | #define atomic_load_explicit(object, order) \ |
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| 282 | __atomic_load_n(&(object)->__val, order) |
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| 283 | #define atomic_store_explicit(object, desired, order) \ |
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| 284 | __atomic_store_n(&(object)->__val, desired, order) |
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| 285 | #else |
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| 286 | #define __atomic_apply_stride(object, operand) \ |
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| 287 | (((__typeof__((object)->__val))0) + (operand)) |
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| 288 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
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| 289 | desired, success, failure) __extension__ ({ \ |
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| 290 | __typeof__(expected) __ep = (expected); \ |
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| 291 | __typeof__(*__ep) __e = *__ep; \ |
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| 292 | (void)(success); (void)(failure); \ |
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| 293 | (_Bool)((*__ep = __sync_val_compare_and_swap(&(object)->__val, \ |
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| 294 | __e, desired)) == __e); \ |
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| 295 | }) |
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| 296 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
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| 297 | desired, success, failure) \ |
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| 298 | atomic_compare_exchange_strong_explicit(object, expected, \ |
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| 299 | desired, success, failure) |
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| 300 | #if __has_builtin(__sync_swap) |
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| 301 | /* Clang provides a full-barrier atomic exchange - use it if available. */ |
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| 302 | #define atomic_exchange_explicit(object, desired, order) \ |
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| 303 | ((void)(order), __sync_swap(&(object)->__val, desired)) |
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| 304 | #else |
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| 305 | /* |
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| 306 | * __sync_lock_test_and_set() is only an acquire barrier in theory (although in |
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| 307 | * practice it is usually a full barrier) so we need an explicit barrier before |
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| 308 | * it. |
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| 309 | */ |
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| 310 | #define atomic_exchange_explicit(object, desired, order) \ |
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| 311 | __extension__ ({ \ |
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| 312 | __typeof__(object) __o = (object); \ |
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| 313 | __typeof__(desired) __d = (desired); \ |
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| 314 | (void)(order); \ |
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| 315 | __sync_synchronize(); \ |
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| 316 | __sync_lock_test_and_set(&(__o)->__val, __d); \ |
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| 317 | }) |
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| 318 | #endif |
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| 319 | #define atomic_fetch_add_explicit(object, operand, order) \ |
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| 320 | ((void)(order), __sync_fetch_and_add(&(object)->__val, \ |
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| 321 | __atomic_apply_stride(object, operand))) |
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| 322 | #define atomic_fetch_and_explicit(object, operand, order) \ |
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| 323 | ((void)(order), __sync_fetch_and_and(&(object)->__val, operand)) |
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| 324 | #define atomic_fetch_or_explicit(object, operand, order) \ |
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| 325 | ((void)(order), __sync_fetch_and_or(&(object)->__val, operand)) |
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| 326 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
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| 327 | ((void)(order), __sync_fetch_and_sub(&(object)->__val, \ |
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| 328 | __atomic_apply_stride(object, operand))) |
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| 329 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
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| 330 | ((void)(order), __sync_fetch_and_xor(&(object)->__val, operand)) |
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| 331 | #define atomic_load_explicit(object, order) \ |
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| 332 | ((void)(order), __sync_fetch_and_add(&(object)->__val, 0)) |
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| 333 | #define atomic_store_explicit(object, desired, order) \ |
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| 334 | ((void)atomic_exchange_explicit(object, desired, order)) |
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| 335 | #endif |
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| 336 | |||
| 337 | /* |
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| 338 | * Convenience functions. |
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| 339 | * |
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| 340 | * Don't provide these in kernel space. In kernel space, we should be |
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| 341 | * disciplined enough to always provide explicit barriers. |
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| 342 | */ |
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| 343 | |||
| 344 | #ifndef _KERNEL |
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| 345 | #define atomic_compare_exchange_strong(object, expected, desired) \ |
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| 346 | atomic_compare_exchange_strong_explicit(object, expected, \ |
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| 347 | desired, memory_order_seq_cst, memory_order_seq_cst) |
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| 348 | #define atomic_compare_exchange_weak(object, expected, desired) \ |
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| 349 | atomic_compare_exchange_weak_explicit(object, expected, \ |
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| 350 | desired, memory_order_seq_cst, memory_order_seq_cst) |
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| 351 | #define atomic_exchange(object, desired) \ |
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| 352 | atomic_exchange_explicit(object, desired, memory_order_seq_cst) |
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| 353 | #define atomic_fetch_add(object, operand) \ |
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| 354 | atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) |
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| 355 | #define atomic_fetch_and(object, operand) \ |
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| 356 | atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) |
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| 357 | #define atomic_fetch_or(object, operand) \ |
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| 358 | atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) |
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| 359 | #define atomic_fetch_sub(object, operand) \ |
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| 360 | atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) |
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| 361 | #define atomic_fetch_xor(object, operand) \ |
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| 362 | atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) |
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| 363 | #define atomic_load(object) \ |
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| 364 | atomic_load_explicit(object, memory_order_seq_cst) |
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| 365 | #define atomic_store(object, desired) \ |
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| 366 | atomic_store_explicit(object, desired, memory_order_seq_cst) |
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| 367 | #endif /* !_KERNEL */ |
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| 368 | |||
| 369 | /* |
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| 370 | * 7.17.8 Atomic flag type and operations. |
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| 371 | * |
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| 372 | * XXX: Assume atomic_bool can be used as an atomic_flag. Is there some |
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| 373 | * kind of compiler built-in type we could use? |
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| 374 | */ |
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| 375 | |||
| 376 | typedef struct { |
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| 377 | atomic_bool __flag; |
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| 378 | } atomic_flag; |
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| 379 | |||
| 380 | #define ATOMIC_FLAG_INIT { ATOMIC_VAR_INIT(0) } |
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| 381 | |||
| 382 | static __inline _Bool |
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| 383 | atomic_flag_test_and_set_explicit(volatile atomic_flag *__object, |
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| 384 | memory_order __order) |
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| 385 | { |
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| 386 | return (atomic_exchange_explicit(&__object->__flag, 1, __order)); |
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| 387 | } |
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| 388 | |||
| 389 | static __inline void |
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| 390 | atomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order) |
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| 391 | { |
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| 392 | |||
| 393 | atomic_store_explicit(&__object->__flag, 0, __order); |
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| 394 | } |
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| 395 | |||
| 396 | #ifndef _KERNEL |
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| 397 | static __inline _Bool |
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| 398 | atomic_flag_test_and_set(volatile atomic_flag *__object) |
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| 399 | { |
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| 400 | |||
| 401 | return (atomic_flag_test_and_set_explicit(__object, |
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| 402 | memory_order_seq_cst)); |
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| 403 | } |
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| 404 | |||
| 405 | static __inline void |
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| 406 | atomic_flag_clear(volatile atomic_flag *__object) |
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| 407 | { |
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| 408 | |||
| 409 | atomic_flag_clear_explicit(__object, memory_order_seq_cst); |
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| 410 | } |
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| 411 | #endif /* !_KERNEL */ |
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| 412 | |||
| 413 | #endif /* !_STDATOMIC_H_ */ |