1228862Stheraven/*- 2228862Stheraven * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> 3228862Stheraven * David Chisnall <theraven@FreeBSD.org> 4228862Stheraven * All rights reserved. 5228862Stheraven * 6228862Stheraven * Redistribution and use in source and binary forms, with or without 7228862Stheraven * modification, are permitted provided that the following conditions 8228862Stheraven * are met: 9228862Stheraven * 1. Redistributions of source code must retain the above copyright 10228862Stheraven * notice, this list of conditions and the following disclaimer. 11228862Stheraven * 2. Redistributions in binary form must reproduce the above copyright 12228862Stheraven * notice, this list of conditions and the following disclaimer in the 13228862Stheraven * documentation and/or other materials provided with the distribution. 14228862Stheraven * 15228862Stheraven * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16228862Stheraven * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17228862Stheraven * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18228862Stheraven * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19228862Stheraven * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20228862Stheraven * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21228862Stheraven * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22228862Stheraven * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23228862Stheraven * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24228862Stheraven * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25228862Stheraven * SUCH DAMAGE. 26228862Stheraven * 27228862Stheraven * $FreeBSD$ 28228862Stheraven */ 29228862Stheraven 30228862Stheraven#ifndef _STDATOMIC_H_ 31228862Stheraven#define _STDATOMIC_H_ 32228862Stheraven 33228862Stheraven#include <sys/cdefs.h> 34228862Stheraven#include <sys/_types.h> 35228862Stheraven 36239960Sed#if __has_extension(c_atomic) || __has_extension(cxx_atomic) 37228862Stheraven#define __CLANG_ATOMICS 38228977Sed#elif __GNUC_PREREQ__(4, 7) 39228862Stheraven#define __GNUC_ATOMICS 40251694Sed#elif defined(__GNUC__) 41251694Sed#define __SYNC_ATOMICS 42251694Sed#else 43228862Stheraven#error "stdatomic.h does not support your compiler" 44228862Stheraven#endif 45228862Stheraven 46228862Stheraven/* 47251347Sed * 7.17.1 Atomic lock-free macros. 48251347Sed */ 49251347Sed 50251347Sed#ifdef __GCC_ATOMIC_BOOL_LOCK_FREE 51251347Sed#define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE 52251347Sed#endif 53251347Sed#ifdef __GCC_ATOMIC_CHAR_LOCK_FREE 54251347Sed#define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE 55251347Sed#endif 56251347Sed#ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE 57251347Sed#define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE 58251347Sed#endif 59251347Sed#ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE 60251347Sed#define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE 61251347Sed#endif 62251347Sed#ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE 63251347Sed#define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE 64251347Sed#endif 65251347Sed#ifdef __GCC_ATOMIC_SHORT_LOCK_FREE 66251347Sed#define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE 67251347Sed#endif 68251347Sed#ifdef __GCC_ATOMIC_INT_LOCK_FREE 69251347Sed#define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE 70251347Sed#endif 71251347Sed#ifdef __GCC_ATOMIC_LONG_LOCK_FREE 72251347Sed#define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE 73251347Sed#endif 74251347Sed#ifdef __GCC_ATOMIC_LLONG_LOCK_FREE 75251347Sed#define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE 76251347Sed#endif 77251347Sed#ifdef __GCC_ATOMIC_POINTER_LOCK_FREE 78251347Sed#define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE 79251347Sed#endif 80251347Sed 81251347Sed/* 82228862Stheraven * 7.17.2 Initialization. 83228862Stheraven */ 84228862Stheraven 85228862Stheraven#if defined(__CLANG_ATOMICS) 86228882Sed#define ATOMIC_VAR_INIT(value) (value) 87234958Stheraven#define atomic_init(obj, value) __c11_atomic_init(obj, value) 88228977Sed#else 89228882Sed#define ATOMIC_VAR_INIT(value) { .__val = (value) } 90240970Stijl#define atomic_init(obj, value) ((void)((obj)->__val = (value))) 91228862Stheraven#endif 92228862Stheraven 93228862Stheraven/* 94228862Stheraven * Clang and recent GCC both provide predefined macros for the memory 95228862Stheraven * orderings. If we are using a compiler that doesn't define them, use the 96228862Stheraven * clang values - these will be ignored in the fallback path. 97228862Stheraven */ 98228862Stheraven 99228862Stheraven#ifndef __ATOMIC_RELAXED 100228882Sed#define __ATOMIC_RELAXED 0 101228862Stheraven#endif 102228862Stheraven#ifndef __ATOMIC_CONSUME 103228882Sed#define __ATOMIC_CONSUME 1 104228862Stheraven#endif 105228862Stheraven#ifndef __ATOMIC_ACQUIRE 106228882Sed#define __ATOMIC_ACQUIRE 2 107228862Stheraven#endif 108228862Stheraven#ifndef __ATOMIC_RELEASE 109228882Sed#define __ATOMIC_RELEASE 3 110228862Stheraven#endif 111228862Stheraven#ifndef __ATOMIC_ACQ_REL 112228882Sed#define __ATOMIC_ACQ_REL 4 113228862Stheraven#endif 114228862Stheraven#ifndef __ATOMIC_SEQ_CST 115228882Sed#define __ATOMIC_SEQ_CST 5 116228862Stheraven#endif 117228862Stheraven 118228862Stheraven/* 119228862Stheraven * 7.17.3 Order and consistency. 120228862Stheraven * 121228862Stheraven * The memory_order_* constants that denote the barrier behaviour of the 122228882Sed * atomic operations. 123228862Stheraven */ 124228862Stheraven 125252411Sedtypedef enum { 126228862Stheraven memory_order_relaxed = __ATOMIC_RELAXED, 127228862Stheraven memory_order_consume = __ATOMIC_CONSUME, 128228862Stheraven memory_order_acquire = __ATOMIC_ACQUIRE, 129228862Stheraven memory_order_release = __ATOMIC_RELEASE, 130228862Stheraven memory_order_acq_rel = __ATOMIC_ACQ_REL, 131228862Stheraven memory_order_seq_cst = __ATOMIC_SEQ_CST 132252411Sed} memory_order; 133228862Stheraven 134228862Stheraven/* 135228862Stheraven * 7.17.4 Fences. 136228862Stheraven */ 137228862Stheraven 138252411Sedstatic __inline void 139252411Sedatomic_thread_fence(memory_order __order __unused) 140252411Sed{ 141252411Sed 142234958Stheraven#ifdef __CLANG_ATOMICS 143252411Sed __c11_atomic_thread_fence(__order); 144234958Stheraven#elif defined(__GNUC_ATOMICS) 145252411Sed __atomic_thread_fence(__order); 146228977Sed#else 147252411Sed __sync_synchronize(); 148228862Stheraven#endif 149252411Sed} 150228862Stheraven 151252411Sedstatic __inline void 152252411Sedatomic_signal_fence(memory_order __order __unused) 153252411Sed{ 154252411Sed 155252411Sed#ifdef __CLANG_ATOMICS 156252411Sed __c11_atomic_signal_fence(__order); 157252411Sed#elif defined(__GNUC_ATOMICS) 158252411Sed __atomic_signal_fence(__order); 159252411Sed#else 160252411Sed __asm volatile ("" ::: "memory"); 161252411Sed#endif 162252411Sed} 163252411Sed 164228862Stheraven/* 165228862Stheraven * 7.17.5 Lock-free property. 166228862Stheraven */ 167228862Stheraven 168251694Sed#if defined(_KERNEL) 169251694Sed/* Atomics in kernelspace are always lock-free. */ 170228977Sed#define atomic_is_lock_free(obj) \ 171251694Sed ((void)(obj), (_Bool)1) 172251694Sed#elif defined(__CLANG_ATOMICS) 173251694Sed#define atomic_is_lock_free(obj) \ 174251566Sed __atomic_is_lock_free(sizeof(*(obj)), obj) 175251566Sed#elif defined(__GNUC_ATOMICS) 176251566Sed#define atomic_is_lock_free(obj) \ 177251192Sed __atomic_is_lock_free(sizeof((obj)->__val), &(obj)->__val) 178228977Sed#else 179228977Sed#define atomic_is_lock_free(obj) \ 180240970Stijl ((void)(obj), sizeof((obj)->__val) <= sizeof(void *)) 181228862Stheraven#endif 182228862Stheraven 183228862Stheraven/* 184228862Stheraven * 7.17.6 Atomic integer types. 185228862Stheraven */ 186228862Stheraven 187228862Stheraventypedef _Atomic(_Bool) atomic_bool; 188228862Stheraventypedef _Atomic(char) atomic_char; 189228862Stheraventypedef _Atomic(signed char) atomic_schar; 190228862Stheraventypedef _Atomic(unsigned char) atomic_uchar; 191228862Stheraventypedef _Atomic(short) atomic_short; 192228862Stheraventypedef _Atomic(unsigned short) atomic_ushort; 193228862Stheraventypedef _Atomic(int) atomic_int; 194228862Stheraventypedef _Atomic(unsigned int) atomic_uint; 195228862Stheraventypedef _Atomic(long) atomic_long; 196228862Stheraventypedef _Atomic(unsigned long) atomic_ulong; 197228862Stheraventypedef _Atomic(long long) atomic_llong; 198228862Stheraventypedef _Atomic(unsigned long long) atomic_ullong; 199228862Stheraventypedef _Atomic(__char16_t) atomic_char16_t; 200228862Stheraventypedef _Atomic(__char32_t) atomic_char32_t; 201264496Stijltypedef _Atomic(___wchar_t) atomic_wchar_t; 202228862Stheraventypedef _Atomic(__int_least8_t) atomic_int_least8_t; 203228862Stheraventypedef _Atomic(__uint_least8_t) atomic_uint_least8_t; 204228862Stheraventypedef _Atomic(__int_least16_t) atomic_int_least16_t; 205228862Stheraventypedef _Atomic(__uint_least16_t) atomic_uint_least16_t; 206228862Stheraventypedef _Atomic(__int_least32_t) atomic_int_least32_t; 207228862Stheraventypedef _Atomic(__uint_least32_t) atomic_uint_least32_t; 208228862Stheraventypedef _Atomic(__int_least64_t) atomic_int_least64_t; 209228862Stheraventypedef _Atomic(__uint_least64_t) atomic_uint_least64_t; 210228862Stheraventypedef _Atomic(__int_fast8_t) atomic_int_fast8_t; 211228862Stheraventypedef _Atomic(__uint_fast8_t) atomic_uint_fast8_t; 212228862Stheraventypedef _Atomic(__int_fast16_t) atomic_int_fast16_t; 213228862Stheraventypedef _Atomic(__uint_fast16_t) atomic_uint_fast16_t; 214228862Stheraventypedef _Atomic(__int_fast32_t) atomic_int_fast32_t; 215228862Stheraventypedef _Atomic(__uint_fast32_t) atomic_uint_fast32_t; 216228862Stheraventypedef _Atomic(__int_fast64_t) atomic_int_fast64_t; 217228862Stheraventypedef _Atomic(__uint_fast64_t) atomic_uint_fast64_t; 218228862Stheraventypedef _Atomic(__intptr_t) atomic_intptr_t; 219228862Stheraventypedef _Atomic(__uintptr_t) atomic_uintptr_t; 220228862Stheraventypedef _Atomic(__size_t) atomic_size_t; 221228862Stheraventypedef _Atomic(__ptrdiff_t) atomic_ptrdiff_t; 222228862Stheraventypedef _Atomic(__intmax_t) atomic_intmax_t; 223228862Stheraventypedef _Atomic(__uintmax_t) atomic_uintmax_t; 224228862Stheraven 225228862Stheraven/* 226228862Stheraven * 7.17.7 Operations on atomic types. 227228862Stheraven */ 228228862Stheraven 229228862Stheraven/* 230228862Stheraven * Compiler-specific operations. 231228862Stheraven */ 232228862Stheraven 233228862Stheraven#if defined(__CLANG_ATOMICS) 234228862Stheraven#define atomic_compare_exchange_strong_explicit(object, expected, \ 235228862Stheraven desired, success, failure) \ 236234958Stheraven __c11_atomic_compare_exchange_strong(object, expected, desired, \ 237228862Stheraven success, failure) 238228862Stheraven#define atomic_compare_exchange_weak_explicit(object, expected, \ 239228862Stheraven desired, success, failure) \ 240234958Stheraven __c11_atomic_compare_exchange_weak(object, expected, desired, \ 241228862Stheraven success, failure) 242228862Stheraven#define atomic_exchange_explicit(object, desired, order) \ 243234958Stheraven __c11_atomic_exchange(object, desired, order) 244228862Stheraven#define atomic_fetch_add_explicit(object, operand, order) \ 245234958Stheraven __c11_atomic_fetch_add(object, operand, order) 246228862Stheraven#define atomic_fetch_and_explicit(object, operand, order) \ 247234958Stheraven __c11_atomic_fetch_and(object, operand, order) 248228862Stheraven#define atomic_fetch_or_explicit(object, operand, order) \ 249234958Stheraven __c11_atomic_fetch_or(object, operand, order) 250228862Stheraven#define atomic_fetch_sub_explicit(object, operand, order) \ 251234958Stheraven __c11_atomic_fetch_sub(object, operand, order) 252228862Stheraven#define atomic_fetch_xor_explicit(object, operand, order) \ 253234958Stheraven __c11_atomic_fetch_xor(object, operand, order) 254228862Stheraven#define atomic_load_explicit(object, order) \ 255234958Stheraven __c11_atomic_load(object, order) 256228862Stheraven#define atomic_store_explicit(object, desired, order) \ 257234958Stheraven __c11_atomic_store(object, desired, order) 258228862Stheraven#elif defined(__GNUC_ATOMICS) 259228862Stheraven#define atomic_compare_exchange_strong_explicit(object, expected, \ 260228977Sed desired, success, failure) \ 261228977Sed __atomic_compare_exchange_n(&(object)->__val, expected, \ 262228977Sed desired, 0, success, failure) 263228977Sed#define atomic_compare_exchange_weak_explicit(object, expected, \ 264228977Sed desired, success, failure) \ 265228977Sed __atomic_compare_exchange_n(&(object)->__val, expected, \ 266228977Sed desired, 1, success, failure) 267228977Sed#define atomic_exchange_explicit(object, desired, order) \ 268228977Sed __atomic_exchange_n(&(object)->__val, desired, order) 269228977Sed#define atomic_fetch_add_explicit(object, operand, order) \ 270228977Sed __atomic_fetch_add(&(object)->__val, operand, order) 271228977Sed#define atomic_fetch_and_explicit(object, operand, order) \ 272228977Sed __atomic_fetch_and(&(object)->__val, operand, order) 273228977Sed#define atomic_fetch_or_explicit(object, operand, order) \ 274228977Sed __atomic_fetch_or(&(object)->__val, operand, order) 275228977Sed#define atomic_fetch_sub_explicit(object, operand, order) \ 276228977Sed __atomic_fetch_sub(&(object)->__val, operand, order) 277228977Sed#define atomic_fetch_xor_explicit(object, operand, order) \ 278228977Sed __atomic_fetch_xor(&(object)->__val, operand, order) 279228977Sed#define atomic_load_explicit(object, order) \ 280228977Sed __atomic_load_n(&(object)->__val, order) 281228977Sed#define atomic_store_explicit(object, desired, order) \ 282228977Sed __atomic_store_n(&(object)->__val, desired, order) 283228977Sed#else 284252413Sed#define __atomic_apply_stride(object, operand) \ 285252413Sed (((__typeof__((object)->__val))0) + (operand)) 286228977Sed#define atomic_compare_exchange_strong_explicit(object, expected, \ 287240970Stijl desired, success, failure) __extension__ ({ \ 288241077Stijl __typeof__(expected) __ep = (expected); \ 289241077Stijl __typeof__(*__ep) __e = *__ep; \ 290241077Stijl (void)(success); (void)(failure); \ 291254497Stijl (_Bool)((*__ep = __sync_val_compare_and_swap(&(object)->__val, \ 292254497Stijl __e, desired)) == __e); \ 293228906Sed}) 294228862Stheraven#define atomic_compare_exchange_weak_explicit(object, expected, \ 295228862Stheraven desired, success, failure) \ 296228862Stheraven atomic_compare_exchange_strong_explicit(object, expected, \ 297228862Stheraven desired, success, failure) 298228862Stheraven#if __has_builtin(__sync_swap) 299228862Stheraven/* Clang provides a full-barrier atomic exchange - use it if available. */ 300240970Stijl#define atomic_exchange_explicit(object, desired, order) \ 301240970Stijl ((void)(order), __sync_swap(&(object)->__val, desired)) 302228862Stheraven#else 303228862Stheraven/* 304228862Stheraven * __sync_lock_test_and_set() is only an acquire barrier in theory (although in 305240970Stijl * practice it is usually a full barrier) so we need an explicit barrier before 306228862Stheraven * it. 307228862Stheraven */ 308240970Stijl#define atomic_exchange_explicit(object, desired, order) \ 309240970Stijl__extension__ ({ \ 310240970Stijl __typeof__(object) __o = (object); \ 311240970Stijl __typeof__(desired) __d = (desired); \ 312240970Stijl (void)(order); \ 313228862Stheraven __sync_synchronize(); \ 314240970Stijl __sync_lock_test_and_set(&(__o)->__val, __d); \ 315228862Stheraven}) 316228862Stheraven#endif 317228862Stheraven#define atomic_fetch_add_explicit(object, operand, order) \ 318252413Sed ((void)(order), __sync_fetch_and_add(&(object)->__val, \ 319252413Sed __atomic_apply_stride(object, operand))) 320228862Stheraven#define atomic_fetch_and_explicit(object, operand, order) \ 321241077Stijl ((void)(order), __sync_fetch_and_and(&(object)->__val, operand)) 322228862Stheraven#define atomic_fetch_or_explicit(object, operand, order) \ 323241077Stijl ((void)(order), __sync_fetch_and_or(&(object)->__val, operand)) 324228862Stheraven#define atomic_fetch_sub_explicit(object, operand, order) \ 325252413Sed ((void)(order), __sync_fetch_and_sub(&(object)->__val, \ 326252413Sed __atomic_apply_stride(object, operand))) 327228862Stheraven#define atomic_fetch_xor_explicit(object, operand, order) \ 328241077Stijl ((void)(order), __sync_fetch_and_xor(&(object)->__val, operand)) 329228862Stheraven#define atomic_load_explicit(object, order) \ 330241077Stijl ((void)(order), __sync_fetch_and_add(&(object)->__val, 0)) 331241077Stijl#define atomic_store_explicit(object, desired, order) \ 332241077Stijl ((void)atomic_exchange_explicit(object, desired, order)) 333228862Stheraven#endif 334228862Stheraven 335228862Stheraven/* 336228862Stheraven * Convenience functions. 337252411Sed * 338252411Sed * Don't provide these in kernel space. In kernel space, we should be 339252411Sed * disciplined enough to always provide explicit barriers. 340228862Stheraven */ 341228862Stheraven 342252411Sed#ifndef _KERNEL 343228862Stheraven#define atomic_compare_exchange_strong(object, expected, desired) \ 344228862Stheraven atomic_compare_exchange_strong_explicit(object, expected, \ 345228862Stheraven desired, memory_order_seq_cst, memory_order_seq_cst) 346228862Stheraven#define atomic_compare_exchange_weak(object, expected, desired) \ 347228862Stheraven atomic_compare_exchange_weak_explicit(object, expected, \ 348228862Stheraven desired, memory_order_seq_cst, memory_order_seq_cst) 349228862Stheraven#define atomic_exchange(object, desired) \ 350228862Stheraven atomic_exchange_explicit(object, desired, memory_order_seq_cst) 351228862Stheraven#define atomic_fetch_add(object, operand) \ 352228862Stheraven atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) 353228862Stheraven#define atomic_fetch_and(object, operand) \ 354228862Stheraven atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) 355228862Stheraven#define atomic_fetch_or(object, operand) \ 356228862Stheraven atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) 357228862Stheraven#define atomic_fetch_sub(object, operand) \ 358228862Stheraven atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) 359228862Stheraven#define atomic_fetch_xor(object, operand) \ 360228862Stheraven atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) 361228862Stheraven#define atomic_load(object) \ 362228862Stheraven atomic_load_explicit(object, memory_order_seq_cst) 363228862Stheraven#define atomic_store(object, desired) \ 364228862Stheraven atomic_store_explicit(object, desired, memory_order_seq_cst) 365252411Sed#endif /* !_KERNEL */ 366228862Stheraven 367228862Stheraven/* 368228862Stheraven * 7.17.8 Atomic flag type and operations. 369252411Sed * 370252411Sed * XXX: Assume atomic_bool can be used as an atomic_flag. Is there some 371252411Sed * kind of compiler built-in type we could use? 372228862Stheraven */ 373228862Stheraven 374252411Sedtypedef struct { 375252411Sed atomic_bool __flag; 376252411Sed} atomic_flag; 377228862Stheraven 378252411Sed#define ATOMIC_FLAG_INIT { ATOMIC_VAR_INIT(0) } 379228862Stheraven 380252411Sedstatic __inline _Bool 381252411Sedatomic_flag_test_and_set_explicit(volatile atomic_flag *__object, 382252411Sed memory_order __order) 383252411Sed{ 384254465Semaste return (atomic_exchange_explicit(&__object->__flag, 1, __order)); 385252411Sed} 386228862Stheraven 387252411Sedstatic __inline void 388252411Sedatomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order) 389252411Sed{ 390252411Sed 391252411Sed atomic_store_explicit(&__object->__flag, 0, __order); 392252411Sed} 393252411Sed 394252411Sed#ifndef _KERNEL 395252411Sedstatic __inline _Bool 396252411Sedatomic_flag_test_and_set(volatile atomic_flag *__object) 397252411Sed{ 398252411Sed 399252411Sed return (atomic_flag_test_and_set_explicit(__object, 400252411Sed memory_order_seq_cst)); 401252411Sed} 402252411Sed 403252411Sedstatic __inline void 404252411Sedatomic_flag_clear(volatile atomic_flag *__object) 405252411Sed{ 406252411Sed 407252411Sed atomic_flag_clear_explicit(__object, memory_order_seq_cst); 408252411Sed} 409252411Sed#endif /* !_KERNEL */ 410252411Sed 411228862Stheraven#endif /* !_STDATOMIC_H_ */ 412