1 | /*- |
---|
2 | * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> |
---|
3 | * David Chisnall <theraven@FreeBSD.org> |
---|
4 | * All rights reserved. |
---|
5 | * |
---|
6 | * Redistribution and use in source and binary forms, with or without |
---|
7 | * modification, are permitted provided that the following conditions |
---|
8 | * are met: |
---|
9 | * 1. Redistributions of source code must retain the above copyright |
---|
10 | * notice, this list of conditions and the following disclaimer. |
---|
11 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
12 | * notice, this list of conditions and the following disclaimer in the |
---|
13 | * documentation and/or other materials provided with the distribution. |
---|
14 | * |
---|
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
---|
16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
---|
19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
25 | * SUCH DAMAGE. |
---|
26 | * |
---|
27 | * $FreeBSD$ |
---|
28 | */ |
---|
29 | |
---|
30 | #ifndef _STDATOMIC_H_ |
---|
31 | #define _STDATOMIC_H_ |
---|
32 | |
---|
33 | #include <sys/cdefs.h> |
---|
34 | #include <sys/_types.h> |
---|
35 | |
---|
36 | #define __GNUC_ATOMICS /* --jla */ |
---|
37 | |
---|
38 | /* --jla |
---|
39 | #if __has_extension(c_atomic) || __has_extension(cxx_atomic) |
---|
40 | #define __CLANG_ATOMICS |
---|
41 | #elif __GNUC_PREREQ__(4, 7) |
---|
42 | #define __GNUC_ATOMICS |
---|
43 | #elif defined(__GNUC__) |
---|
44 | #define __SYNC_ATOMICS |
---|
45 | #else |
---|
46 | #error "stdatomic.h does not support your compiler" |
---|
47 | #endif |
---|
48 | */ |
---|
49 | |
---|
50 | #define __unused /* --jla */ |
---|
51 | #define _Atomic(T) struct { T volatile __val; } /* --jla */ |
---|
52 | |
---|
53 | /* |
---|
54 | * 7.17.1 Atomic lock-free macros. |
---|
55 | */ |
---|
56 | |
---|
57 | #ifdef __GCC_ATOMIC_BOOL_LOCK_FREE |
---|
58 | #define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE |
---|
59 | #endif |
---|
60 | #ifdef __GCC_ATOMIC_CHAR_LOCK_FREE |
---|
61 | #define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE |
---|
62 | #endif |
---|
63 | #ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
---|
64 | #define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
---|
65 | #endif |
---|
66 | #ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
---|
67 | #define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
---|
68 | #endif |
---|
69 | #ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
---|
70 | #define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
---|
71 | #endif |
---|
72 | #ifdef __GCC_ATOMIC_SHORT_LOCK_FREE |
---|
73 | #define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE |
---|
74 | #endif |
---|
75 | #ifdef __GCC_ATOMIC_INT_LOCK_FREE |
---|
76 | #define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE |
---|
77 | #endif |
---|
78 | #ifdef __GCC_ATOMIC_LONG_LOCK_FREE |
---|
79 | #define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE |
---|
80 | #endif |
---|
81 | #ifdef __GCC_ATOMIC_LLONG_LOCK_FREE |
---|
82 | #define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE |
---|
83 | #endif |
---|
84 | #ifdef __GCC_ATOMIC_POINTER_LOCK_FREE |
---|
85 | #define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE |
---|
86 | #endif |
---|
87 | |
---|
88 | /* |
---|
89 | * 7.17.2 Initialization. |
---|
90 | */ |
---|
91 | |
---|
92 | #if defined(__CLANG_ATOMICS) |
---|
93 | #define ATOMIC_VAR_INIT(value) (value) |
---|
94 | #define atomic_init(obj, value) __c11_atomic_init(obj, value) |
---|
95 | #else |
---|
96 | #define ATOMIC_VAR_INIT(value) { .__val = (value) } |
---|
97 | #define atomic_init(obj, value) ((void)((obj)->__val = (value))) |
---|
98 | #endif |
---|
99 | |
---|
100 | /* |
---|
101 | * Clang and recent GCC both provide predefined macros for the memory |
---|
102 | * orderings. If we are using a compiler that doesn't define them, use the |
---|
103 | * clang values - these will be ignored in the fallback path. |
---|
104 | */ |
---|
105 | |
---|
106 | #ifndef __ATOMIC_RELAXED |
---|
107 | #define __ATOMIC_RELAXED 0 |
---|
108 | #endif |
---|
109 | #ifndef __ATOMIC_CONSUME |
---|
110 | #define __ATOMIC_CONSUME 1 |
---|
111 | #endif |
---|
112 | #ifndef __ATOMIC_ACQUIRE |
---|
113 | #define __ATOMIC_ACQUIRE 2 |
---|
114 | #endif |
---|
115 | #ifndef __ATOMIC_RELEASE |
---|
116 | #define __ATOMIC_RELEASE 3 |
---|
117 | #endif |
---|
118 | #ifndef __ATOMIC_ACQ_REL |
---|
119 | #define __ATOMIC_ACQ_REL 4 |
---|
120 | #endif |
---|
121 | #ifndef __ATOMIC_SEQ_CST |
---|
122 | #define __ATOMIC_SEQ_CST 5 |
---|
123 | #endif |
---|
124 | |
---|
125 | /* |
---|
126 | * 7.17.3 Order and consistency. |
---|
127 | * |
---|
128 | * The memory_order_* constants that denote the barrier behaviour of the |
---|
129 | * atomic operations. |
---|
130 | */ |
---|
131 | |
---|
132 | typedef enum { |
---|
133 | memory_order_relaxed = __ATOMIC_RELAXED, |
---|
134 | memory_order_consume = __ATOMIC_CONSUME, |
---|
135 | memory_order_acquire = __ATOMIC_ACQUIRE, |
---|
136 | memory_order_release = __ATOMIC_RELEASE, |
---|
137 | memory_order_acq_rel = __ATOMIC_ACQ_REL, |
---|
138 | memory_order_seq_cst = __ATOMIC_SEQ_CST |
---|
139 | } memory_order; |
---|
140 | |
---|
141 | /* |
---|
142 | * 7.17.4 Fences. |
---|
143 | */ |
---|
144 | |
---|
145 | static __inline void |
---|
146 | atomic_thread_fence(memory_order __order __unused) |
---|
147 | { |
---|
148 | |
---|
149 | #ifdef __CLANG_ATOMICS |
---|
150 | __c11_atomic_thread_fence(__order); |
---|
151 | #elif defined(__GNUC_ATOMICS) |
---|
152 | __atomic_thread_fence(__order); |
---|
153 | #else |
---|
154 | __sync_synchronize(); |
---|
155 | #endif |
---|
156 | } |
---|
157 | |
---|
158 | static __inline void |
---|
159 | atomic_signal_fence(memory_order __order __unused) |
---|
160 | { |
---|
161 | |
---|
162 | #ifdef __CLANG_ATOMICS |
---|
163 | __c11_atomic_signal_fence(__order); |
---|
164 | #elif defined(__GNUC_ATOMICS) |
---|
165 | __atomic_signal_fence(__order); |
---|
166 | #else |
---|
167 | __asm volatile ("" ::: "memory"); |
---|
168 | #endif |
---|
169 | } |
---|
170 | |
---|
171 | /* |
---|
172 | * 7.17.5 Lock-free property. |
---|
173 | */ |
---|
174 | |
---|
175 | #if defined(_KERNEL) |
---|
176 | /* Atomics in kernelspace are always lock-free. */ |
---|
177 | #define atomic_is_lock_free(obj) \ |
---|
178 | ((void)(obj), (_Bool)1) |
---|
179 | #elif defined(__CLANG_ATOMICS) |
---|
180 | #define atomic_is_lock_free(obj) \ |
---|
181 | __atomic_is_lock_free(sizeof(*(obj)), obj) |
---|
182 | #elif defined(__GNUC_ATOMICS) |
---|
183 | #define atomic_is_lock_free(obj) \ |
---|
184 | __atomic_is_lock_free(sizeof((obj)->__val), &(obj)->__val) |
---|
185 | #else |
---|
186 | #define atomic_is_lock_free(obj) \ |
---|
187 | ((void)(obj), sizeof((obj)->__val) <= sizeof(void *)) |
---|
188 | #endif |
---|
189 | |
---|
190 | /* |
---|
191 | * 7.17.6 Atomic integer types. |
---|
192 | */ |
---|
193 | |
---|
194 | typedef _Atomic(_Bool) atomic_bool; |
---|
195 | typedef _Atomic(char) atomic_char; |
---|
196 | typedef _Atomic(signed char) atomic_schar; |
---|
197 | typedef _Atomic(unsigned char) atomic_uchar; |
---|
198 | typedef _Atomic(short) atomic_short; |
---|
199 | typedef _Atomic(unsigned short) atomic_ushort; |
---|
200 | typedef _Atomic(int) atomic_int; |
---|
201 | typedef _Atomic(unsigned int) atomic_uint; |
---|
202 | typedef _Atomic(long) atomic_long; |
---|
203 | typedef _Atomic(unsigned long) atomic_ulong; |
---|
204 | typedef _Atomic(long long) atomic_llong; |
---|
205 | typedef _Atomic(unsigned long long) atomic_ullong; |
---|
206 | #if 0 |
---|
207 | typedef _Atomic(__char16_t) atomic_char16_t; |
---|
208 | typedef _Atomic(__char32_t) atomic_char32_t; |
---|
209 | #endif |
---|
210 | typedef _Atomic(wchar_t) atomic_wchar_t; |
---|
211 | typedef _Atomic(int_least8_t) atomic_int_least8_t; |
---|
212 | typedef _Atomic(uint_least8_t) atomic_uint_least8_t; |
---|
213 | typedef _Atomic(int_least16_t) atomic_int_least16_t; |
---|
214 | typedef _Atomic(uint_least16_t) atomic_uint_least16_t; |
---|
215 | typedef _Atomic(int_least32_t) atomic_int_least32_t; |
---|
216 | typedef _Atomic(uint_least32_t) atomic_uint_least32_t; |
---|
217 | typedef _Atomic(int_least64_t) atomic_int_least64_t; |
---|
218 | typedef _Atomic(uint_least64_t) atomic_uint_least64_t; |
---|
219 | typedef _Atomic(int_fast8_t) atomic_int_fast8_t; |
---|
220 | typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; |
---|
221 | typedef _Atomic(int_fast16_t) atomic_int_fast16_t; |
---|
222 | typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; |
---|
223 | typedef _Atomic(int_fast32_t) atomic_int_fast32_t; |
---|
224 | typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; |
---|
225 | typedef _Atomic(int_fast64_t) atomic_int_fast64_t; |
---|
226 | typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; |
---|
227 | typedef _Atomic(intptr_t) atomic_intptr_t; |
---|
228 | typedef _Atomic(uintptr_t) atomic_uintptr_t; |
---|
229 | typedef _Atomic(size_t) atomic_size_t; |
---|
230 | typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; |
---|
231 | typedef _Atomic(intmax_t) atomic_intmax_t; |
---|
232 | typedef _Atomic(uintmax_t) atomic_uintmax_t; |
---|
233 | |
---|
234 | /* |
---|
235 | * 7.17.7 Operations on atomic types. |
---|
236 | */ |
---|
237 | |
---|
238 | /* |
---|
239 | * Compiler-specific operations. |
---|
240 | */ |
---|
241 | |
---|
242 | #if defined(__CLANG_ATOMICS) |
---|
243 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
---|
244 | desired, success, failure) \ |
---|
245 | __c11_atomic_compare_exchange_strong(object, expected, desired, \ |
---|
246 | success, failure) |
---|
247 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
---|
248 | desired, success, failure) \ |
---|
249 | __c11_atomic_compare_exchange_weak(object, expected, desired, \ |
---|
250 | success, failure) |
---|
251 | #define atomic_exchange_explicit(object, desired, order) \ |
---|
252 | __c11_atomic_exchange(object, desired, order) |
---|
253 | #define atomic_fetch_add_explicit(object, operand, order) \ |
---|
254 | __c11_atomic_fetch_add(object, operand, order) |
---|
255 | #define atomic_fetch_and_explicit(object, operand, order) \ |
---|
256 | __c11_atomic_fetch_and(object, operand, order) |
---|
257 | #define atomic_fetch_or_explicit(object, operand, order) \ |
---|
258 | __c11_atomic_fetch_or(object, operand, order) |
---|
259 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
---|
260 | __c11_atomic_fetch_sub(object, operand, order) |
---|
261 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
---|
262 | __c11_atomic_fetch_xor(object, operand, order) |
---|
263 | #define atomic_load_explicit(object, order) \ |
---|
264 | __c11_atomic_load(object, order) |
---|
265 | #define atomic_store_explicit(object, desired, order) \ |
---|
266 | __c11_atomic_store(object, desired, order) |
---|
267 | #elif defined(__GNUC_ATOMICS) |
---|
268 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
---|
269 | desired, success, failure) \ |
---|
270 | __atomic_compare_exchange_n(&(object)->__val, expected, \ |
---|
271 | desired, 0, success, failure) |
---|
272 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
---|
273 | desired, success, failure) \ |
---|
274 | __atomic_compare_exchange_n(&(object)->__val, expected, \ |
---|
275 | desired, 1, success, failure) |
---|
276 | #define atomic_exchange_explicit(object, desired, order) \ |
---|
277 | __atomic_exchange_n(&(object)->__val, desired, order) |
---|
278 | #define atomic_fetch_add_explicit(object, operand, order) \ |
---|
279 | __atomic_fetch_add(&(object)->__val, operand, order) |
---|
280 | #define atomic_fetch_and_explicit(object, operand, order) \ |
---|
281 | __atomic_fetch_and(&(object)->__val, operand, order) |
---|
282 | #define atomic_fetch_or_explicit(object, operand, order) \ |
---|
283 | __atomic_fetch_or(&(object)->__val, operand, order) |
---|
284 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
---|
285 | __atomic_fetch_sub(&(object)->__val, operand, order) |
---|
286 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
---|
287 | __atomic_fetch_xor(&(object)->__val, operand, order) |
---|
288 | #define atomic_load_explicit(object, order) \ |
---|
289 | __atomic_load_n(&(object)->__val, order) |
---|
290 | #define atomic_store_explicit(object, desired, order) \ |
---|
291 | __atomic_store_n(&(object)->__val, desired, order) |
---|
292 | #else |
---|
293 | #define __atomic_apply_stride(object, operand) \ |
---|
294 | (((__typeof__((object)->__val))0) + (operand)) |
---|
295 | #define atomic_compare_exchange_strong_explicit(object, expected, \ |
---|
296 | desired, success, failure) __extension__ ({ \ |
---|
297 | __typeof__(expected) __ep = (expected); \ |
---|
298 | __typeof__(*__ep) __e = *__ep; \ |
---|
299 | (void)(success); (void)(failure); \ |
---|
300 | (_Bool)((*__ep = __sync_val_compare_and_swap(&(object)->__val, \ |
---|
301 | __e, desired)) == __e); \ |
---|
302 | }) |
---|
303 | #define atomic_compare_exchange_weak_explicit(object, expected, \ |
---|
304 | desired, success, failure) \ |
---|
305 | atomic_compare_exchange_strong_explicit(object, expected, \ |
---|
306 | desired, success, failure) |
---|
307 | #if 0 /* --jla comment out. */ |
---|
308 | #if __has_builtin(__sync_swap) |
---|
309 | /* Clang provides a full-barrier atomic exchange - use it if available. */ |
---|
310 | #define atomic_exchange_explicit(object, desired, order) \ |
---|
311 | ((void)(order), __sync_swap(&(object)->__val, desired)) |
---|
312 | #endif /* --jla */ |
---|
313 | #else |
---|
314 | /* |
---|
315 | * __sync_lock_test_and_set() is only an acquire barrier in theory (although in |
---|
316 | * practice it is usually a full barrier) so we need an explicit barrier before |
---|
317 | * it. |
---|
318 | */ |
---|
319 | #define atomic_exchange_explicit(object, desired, order) \ |
---|
320 | __extension__ ({ \ |
---|
321 | __typeof__(object) __o = (object); \ |
---|
322 | __typeof__(desired) __d = (desired); \ |
---|
323 | (void)(order); \ |
---|
324 | __sync_synchronize(); \ |
---|
325 | __sync_lock_test_and_set(&(__o)->__val, __d); \ |
---|
326 | }) |
---|
327 | #endif |
---|
328 | #define atomic_fetch_add_explicit(object, operand, order) \ |
---|
329 | ((void)(order), __sync_fetch_and_add(&(object)->__val, \ |
---|
330 | __atomic_apply_stride(object, operand))) |
---|
331 | #define atomic_fetch_and_explicit(object, operand, order) \ |
---|
332 | ((void)(order), __sync_fetch_and_and(&(object)->__val, operand)) |
---|
333 | #define atomic_fetch_or_explicit(object, operand, order) \ |
---|
334 | ((void)(order), __sync_fetch_and_or(&(object)->__val, operand)) |
---|
335 | #define atomic_fetch_sub_explicit(object, operand, order) \ |
---|
336 | ((void)(order), __sync_fetch_and_sub(&(object)->__val, \ |
---|
337 | __atomic_apply_stride(object, operand))) |
---|
338 | #define atomic_fetch_xor_explicit(object, operand, order) \ |
---|
339 | ((void)(order), __sync_fetch_and_xor(&(object)->__val, operand)) |
---|
340 | #define atomic_load_explicit(object, order) \ |
---|
341 | ((void)(order), __sync_fetch_and_add(&(object)->__val, 0)) |
---|
342 | #define atomic_store_explicit(object, desired, order) \ |
---|
343 | ((void)atomic_exchange_explicit(object, desired, order)) |
---|
344 | #endif |
---|
345 | |
---|
346 | /* |
---|
347 | * Convenience functions. |
---|
348 | * |
---|
349 | * Don't provide these in kernel space. In kernel space, we should be |
---|
350 | * disciplined enough to always provide explicit barriers. |
---|
351 | */ |
---|
352 | |
---|
353 | #ifndef _KERNEL |
---|
354 | #define atomic_compare_exchange_strong(object, expected, desired) \ |
---|
355 | atomic_compare_exchange_strong_explicit(object, expected, \ |
---|
356 | desired, memory_order_seq_cst, memory_order_seq_cst) |
---|
357 | #define atomic_compare_exchange_weak(object, expected, desired) \ |
---|
358 | atomic_compare_exchange_weak_explicit(object, expected, \ |
---|
359 | desired, memory_order_seq_cst, memory_order_seq_cst) |
---|
360 | #define atomic_exchange(object, desired) \ |
---|
361 | atomic_exchange_explicit(object, desired, memory_order_seq_cst) |
---|
362 | #define atomic_fetch_add(object, operand) \ |
---|
363 | atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) |
---|
364 | #define atomic_fetch_and(object, operand) \ |
---|
365 | atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) |
---|
366 | #define atomic_fetch_or(object, operand) \ |
---|
367 | atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) |
---|
368 | #define atomic_fetch_sub(object, operand) \ |
---|
369 | atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) |
---|
370 | #define atomic_fetch_xor(object, operand) \ |
---|
371 | atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) |
---|
372 | #define atomic_load(object) \ |
---|
373 | atomic_load_explicit(object, memory_order_seq_cst) |
---|
374 | #define atomic_store(object, desired) \ |
---|
375 | atomic_store_explicit(object, desired, memory_order_seq_cst) |
---|
376 | #endif /* !_KERNEL */ |
---|
377 | |
---|
378 | /* |
---|
379 | * 7.17.8 Atomic flag type and operations. |
---|
380 | * |
---|
381 | * XXX: Assume atomic_bool can be used as an atomic_flag. Is there some |
---|
382 | * kind of compiler built-in type we could use? |
---|
383 | */ |
---|
384 | |
---|
385 | typedef struct { |
---|
386 | atomic_bool __flag; |
---|
387 | } atomic_flag; |
---|
388 | |
---|
389 | #define ATOMIC_FLAG_INIT { ATOMIC_VAR_INIT(0) } |
---|
390 | |
---|
391 | static __inline _Bool |
---|
392 | atomic_flag_test_and_set_explicit(volatile atomic_flag *__object, |
---|
393 | memory_order __order) |
---|
394 | { |
---|
395 | return (atomic_exchange_explicit(&__object->__flag, 1, __order)); |
---|
396 | } |
---|
397 | |
---|
398 | static __inline void |
---|
399 | atomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order) |
---|
400 | { |
---|
401 | |
---|
402 | atomic_store_explicit(&__object->__flag, 0, __order); |
---|
403 | } |
---|
404 | |
---|
405 | #ifndef _KERNEL |
---|
406 | static __inline _Bool |
---|
407 | atomic_flag_test_and_set(volatile atomic_flag *__object) |
---|
408 | { |
---|
409 | |
---|
410 | return (atomic_flag_test_and_set_explicit(__object, |
---|
411 | memory_order_seq_cst)); |
---|
412 | } |
---|
413 | |
---|
414 | static __inline void |
---|
415 | atomic_flag_clear(volatile atomic_flag *__object) |
---|
416 | { |
---|
417 | |
---|
418 | atomic_flag_clear_explicit(__object, memory_order_seq_cst); |
---|
419 | } |
---|
420 | #endif /* !_KERNEL */ |
---|
421 | |
---|
422 | #endif /* !_STDATOMIC_H_ */ |
---|