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stdatomic.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #pragma once #if !defined(__has_feature) #define __has_feature(x) 0 #endif #if !defined(__has_extension) #define __has_extension(x) __has_feature(x) #endif #if !defined(__GNUC_PREREQ__) #if defined(__GNUC__) && defined(__GNUC_MINOR__) #define __GNUC_PREREQ__(maj, min) \ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) #else #define __GNUC_PREREQ__(maj, min) 0 #endif #endif #if !defined(__CLANG_ATOMICS) && !defined(__GNUC_ATOMICS) #if __has_extension(c_atomic) || __has_extension(cxx_atomic) #define __CLANG_ATOMICS #elif __GNUC_PREREQ__(4, 7) #define __GNUC_ATOMICS #elif !defined(__GNUC__) /* cppcheck-suppress preprocessorErrorDirective */ #error "isc/stdatomic.h does not support your compiler" #endif #endif #ifndef __ATOMIC_RELAXED #define __ATOMIC_RELAXED 0 #endif #ifndef __ATOMIC_CONSUME #define __ATOMIC_CONSUME 1 #endif #ifndef __ATOMIC_ACQUIRE #define __ATOMIC_ACQUIRE 2 #endif #ifndef __ATOMIC_RELEASE #define __ATOMIC_RELEASE 3 #endif #ifndef __ATOMIC_ACQ_REL #define __ATOMIC_ACQ_REL 4 #endif #ifndef __ATOMIC_SEQ_CST #define __ATOMIC_SEQ_CST 5 #endif enum memory_order { memory_order_relaxed = __ATOMIC_RELAXED, memory_order_consume = __ATOMIC_CONSUME, memory_order_acquire = __ATOMIC_ACQUIRE, memory_order_release = __ATOMIC_RELEASE, memory_order_acq_rel = __ATOMIC_ACQ_REL, memory_order_seq_cst = __ATOMIC_SEQ_CST }; typedef enum memory_order memory_order; typedef int_fast32_t atomic_int_fast32_t; typedef uint_fast32_t atomic_uint_fast32_t; typedef int_fast64_t atomic_int_fast64_t; typedef uint_fast64_t atomic_uint_fast64_t; #if defined(__CLANG_ATOMICS) /* __c11_atomic builtins */ #define atomic_init(obj, desired) \ __c11_atomic_init(obj, desired) #define atomic_load_explicit(obj, order) \ __c11_atomic_load(obj, order) #define atomic_store_explicit(obj, desired, order) \ __c11_atomic_store(obj, desired, order) #define atomic_fetch_add_explicit(obj, arg, order) \ __c11_atomic_fetch_add(obj, arg, order) #define atomic_fetch_sub_explicit(obj, arg, order) \ __c11_atomic_fetch_sub(obj, arg, order) #define atomic_compare_exchange_strong_explicit(obj, expected, desired, succ, fail) \ __c11_atomic_compare_exchange_strong_explicit(obj, expected, desired, succ, fail) #define atomic_compare_exchange_weak_explicit(obj, expected, desired, succ, fail) \ __c11_atomic_compare_exchange_weak_explicit(obj, expected, desired, succ, fail) #elif defined(__GNUC_ATOMICS) /* __atomic builtins */ #define atomic_init(obj, desired) \ (*obj = desired) #define atomic_load_explicit(obj, order) \ __atomic_load_n(obj, order) #define atomic_store_explicit(obj, desired, order) \ __atomic_store_n(obj, desired, order) #define atomic_fetch_add_explicit(obj, arg, order) \ __atomic_fetch_add(obj, arg, order) #define atomic_fetch_sub_explicit(obj, arg, order) \ __atomic_fetch_sub(obj, arg, order) #define atomic_compare_exchange_strong_explicit(obj, expected, desired, succ, fail) \ __atomic_compare_exchange_n(obj, expected, desired, 0, succ, fail) #define atomic_compare_exchange_weak_explicit(obj, expected, desired, succ, fail) \ __atomic_compare_exchange_n(obj, expected, desired, 1, succ, fail) #else /* __sync builtins */ #define atomic_init(obj, desired) \ (*obj = desired) #define atomic_load_explicit(obj, order) \ __sync_fetch_and_add(obj, 0) #define atomic_store_explicit(obj, desired, order) \ do { \ __sync_synchronize(); \ *obj = desired; \ __sync_synchronize(); \ } while (0); #define atomic_fetch_add_explicit(obj, arg, order) \ __sync_fetch_and_add(obj, arg) #define atomic_fetch_sub_explicit(obj, arg, order) \ __sync_fetch_and_sub(obj, arg, order) #define atomic_compare_exchange_strong_explicit(obj, expected, desired, succ, fail) \ ({ \ __typeof__(obj) __v; \ _Bool __r; \ __v = __sync_val_compare_and_swap(obj, *(expected), desired); \ __r = *(expected) == __v; \ *(expected) = __v; \ __r; \ }) #define atomic_compare_exchange_weak_explicit(obj, expected, desired, succ, fail) \ atomic_compare_exchange_strong_explicit(obj, expected, desired, succ, fail) #endif #define atomic_load(obj) \ atomic_load_explicit(obj, memory_order_seq_cst) #define atomic_store(obj) \ atomic_store_explicit(obj, memory_order_seq_cst) #define atomic_fetch_add(obj) \ atomic_fetch_add_explicit(obj, arg, memory_order_seq_cst) #define atomic_fetch_sub(obj) \ atomic_fetch_sub_explicit(obj, arg, memory_order_seq_cst) #define atomic_compare_exchange_strong(obj, expected, desired) \ atomic_compare_exchange_strong_explicit(obj, expected, desired, memory_order_seq_cst, memory_order_seq_cst) #define atomic_compare_exchange_weak(obj, expected, desired) \ atomic_compare_exchange_weak_explicit(obj, expected, desired, memory_order_seq_cst, memory_order_seq_cst)
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