include/stdatomic.h

   1 /* This file is derived from clang's stdatomic.h */
   2
   3 /*===---- stdatomic.h - Standard header for atomic types and operations -----===
   4  *
   5  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6  * See https://llvm.org/LICENSE.txt for license information.
   7  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8  *
   9  *===-----------------------------------------------------------------------===
  10  */
  11
  12 #ifndef _STDATOMIC_H
  13 #define _STDATOMIC_H
  14
  15 #include <stddef.h>
  16 #include <stdint.h>
  17 #include <stdbool.h>
  18
  19 #define __ATOMIC_RELAXED 0
  20 #define __ATOMIC_CONSUME 1
  21 #define __ATOMIC_ACQUIRE 2
  22 #define __ATOMIC_RELEASE 3
  23 #define __ATOMIC_ACQ_REL 4
  24 #define __ATOMIC_SEQ_CST 5
  25
  26 /* Memory ordering */
  27 typedef enum {
  28     memory_order_relaxed = __ATOMIC_RELAXED,
  29     memory_order_consume = __ATOMIC_CONSUME,
  30     memory_order_acquire = __ATOMIC_ACQUIRE,
  31     memory_order_release = __ATOMIC_RELEASE,
  32     memory_order_acq_rel = __ATOMIC_ACQ_REL,
  33     memory_order_seq_cst = __ATOMIC_SEQ_CST,
  34 } memory_order;
  35
  36 /* Atomic typedefs */
  37 typedef _Atomic(_Bool) atomic_bool;
  38 typedef _Atomic(char) atomic_char;
  39 typedef _Atomic(signed char) atomic_schar;
  40 typedef _Atomic(unsigned char) atomic_uchar;
  41 typedef _Atomic(short) atomic_short;
  42 typedef _Atomic(unsigned short) atomic_ushort;
  43 typedef _Atomic(int) atomic_int;
  44 typedef _Atomic(unsigned int) atomic_uint;
  45 typedef _Atomic(long) atomic_long;
  46 typedef _Atomic(unsigned long) atomic_ulong;
  47 typedef _Atomic(long long) atomic_llong;
  48 typedef _Atomic(unsigned long long) atomic_ullong;
  49 typedef _Atomic(uint_least16_t) atomic_char16_t;
  50 typedef _Atomic(uint_least32_t) atomic_char32_t;
  51 typedef _Atomic(wchar_t) atomic_wchar_t;
  52 typedef _Atomic(int_least8_t) atomic_int_least8_t;
  53 typedef _Atomic(uint_least8_t) atomic_uint_least8_t;
  54 typedef _Atomic(int_least16_t) atomic_int_least16_t;
  55 typedef _Atomic(uint_least16_t) atomic_uint_least16_t;
  56 typedef _Atomic(int_least32_t) atomic_int_least32_t;
  57 typedef _Atomic(uint_least32_t) atomic_uint_least32_t;
  58 typedef _Atomic(int_least64_t) atomic_int_least64_t;
  59 typedef _Atomic(uint_least64_t) atomic_uint_least64_t;
  60 typedef _Atomic(int_fast8_t) atomic_int_fast8_t;
  61 typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t;
  62 typedef _Atomic(int_fast16_t) atomic_int_fast16_t;
  63 typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t;
  64 typedef _Atomic(int_fast32_t) atomic_int_fast32_t;
  65 typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t;
  66 typedef _Atomic(int_fast64_t) atomic_int_fast64_t;
  67 typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t;
  68 typedef _Atomic(intptr_t) atomic_intptr_t;
  69 typedef _Atomic(uintptr_t) atomic_uintptr_t;
  70 typedef _Atomic(size_t) atomic_size_t;
  71 typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t;
  72 typedef _Atomic(intmax_t) atomic_intmax_t;
  73 typedef _Atomic(uintmax_t) atomic_uintmax_t;
  74
  75 /* Atomic flag */
  76 typedef struct {
  77     atomic_bool value;
  78 } atomic_flag;
  79
  80 #define ATOMIC_FLAG_INIT {0}
  81 #define ATOMIC_VAR_INIT(value) (value)
  82
  83 #define atomic_flag_test_and_set_explicit(object, order)                  \
  84     __atomic_test_and_set((void *)(&((object)->value)), order)
  85 #define atomic_flag_test_and_set(object)                                  \
  86     atomic_flag_test_and_set_explicit(object, __ATOMIC_SEQ_CST)
  87
  88 #define atomic_flag_clear_explicit(object, order)                         \
  89     __atomic_clear((bool *)(&((object)->value)), order)
  90 #define atomic_flag_clear(object) \
  91     atomic_flag_clear_explicit(object, __ATOMIC_SEQ_CST)
  92
  93 /* Generic routines */
  94 #define atomic_init(object, desired)                                      \
  95     atomic_store_explicit(object, desired, __ATOMIC_RELAXED)
  96
  97 #define atomic_store_explicit(object, desired, order)                     \
  98     ({ __typeof__ (object) ptr = (object);                                \
  99        __typeof__ (*ptr) tmp = (desired);                                 \
 100        __atomic_store (ptr, &tmp, (order));                               \
 101     })
 102 #define atomic_store(object, desired)                                     \
 103      atomic_store_explicit (object, desired, __ATOMIC_SEQ_CST)
 104
 105 #define atomic_load_explicit(object, order)                               \
 106     ({ __typeof__ (object) ptr = (object);                                \
 107        __typeof__ (*ptr) tmp;                                             \
 108        __atomic_load (ptr, &tmp, (order));                                \
 109        tmp;                                                               \
 110     })
 111 #define atomic_load(object) atomic_load_explicit (object, __ATOMIC_SEQ_CST)
 112
 113 #define atomic_exchange_explicit(object, desired, order)                  \
 114     ({ __typeof__ (object) ptr = (object);                                \
 115        __typeof__ (*ptr) val = (desired);                                 \
 116        __typeof__ (*ptr) tmp;                                             \
 117        __atomic_exchange (ptr, &val, &tmp, (order));                      \
 118        tmp;                                                               \
 119     })
 120 #define atomic_exchange(object, desired)                                  \
 121   atomic_exchange_explicit (object, desired, __ATOMIC_SEQ_CST)
 122
 123 #define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \
 124     ({ __typeof__ (object) ptr = (object);                                \
 125        __typeof__ (*ptr) tmp = desired;                                   \
 126        __atomic_compare_exchange(ptr, expected, &tmp, 0, success, failure); \
 127     })
 128 #define atomic_compare_exchange_strong(object, expected, desired)         \
 129     atomic_compare_exchange_strong_explicit (object, expected, desired,   \
 130                                              __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
 131
 132 #define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \
 133     ({ __typeof__ (object) ptr = (object);                                \
 134        __typeof__ (*ptr) tmp = desired;                                   \
 135        __atomic_compare_exchange(ptr, expected, &tmp, 1, success, failure); \
 136     })
 137 #define atomic_compare_exchange_weak(object, expected, desired)           \
 138     atomic_compare_exchange_weak_explicit (object, expected, desired,     \
 139                                            __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
 140
 141 #define atomic_fetch_add(object, operand) \
 142     __atomic_fetch_add(object, operand, __ATOMIC_SEQ_CST)
 143 #define atomic_fetch_add_explicit __atomic_fetch_add
 144
 145 #define atomic_fetch_sub(object, operand) \
 146     __atomic_fetch_sub(object, operand, __ATOMIC_SEQ_CST)
 147 #define atomic_fetch_sub_explicit __atomic_fetch_sub
 148
 149 #define atomic_fetch_or(object, operand) \
 150     __atomic_fetch_or(object, operand, __ATOMIC_SEQ_CST)
 151 #define atomic_fetch_or_explicit __atomic_fetch_or
 152
 153 #define atomic_fetch_xor(object, operand) \
 154     __atomic_fetch_xor(object, operand, __ATOMIC_SEQ_CST)
 155 #define atomic_fetch_xor_explicit __atomic_fetch_xor
 156
 157 #define atomic_fetch_and(object, operand) \
 158     __atomic_fetch_and(object, operand, __ATOMIC_SEQ_CST)
 159 #define atomic_fetch_and_explicit __atomic_fetch_and
 160
 161 extern void atomic_thread_fence (memory_order);
 162 extern void __atomic_thread_fence (memory_order);
 163 #define atomic_thread_fence(order) __atomic_thread_fence (order)
 164 extern void atomic_signal_fence (memory_order);
 165 extern void __atomic_signal_fence (memory_order);
 166 #define atomic_signal_fence(order) __atomic_signal_fence  (order)
 167 extern bool __atomic_is_lock_free(size_t size, void *ptr);
 168 #define atomic_is_lock_free(OBJ) __atomic_is_lock_free (sizeof (*(OBJ)), (OBJ))
 169
 170 extern bool __atomic_test_and_set (void *, memory_order);
 171 extern void __atomic_clear (bool *, memory_order);
 172
 173 #endif /* _STDATOMIC_H */