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94a86be0 | 1 | // -*- C++ -*- header. |
afd88205 | 2 | |
99dee823 | 3 | // Copyright (C) 2008-2021 Free Software Foundation, Inc. |
afd88205 BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // Under Section 7 of GPL version 3, you are granted additional | |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
24 | ||
036e0d4f | 25 | /** @file bits/atomic_base.h |
94a86be0 | 26 | * This is an internal header file, included by other library headers. |
f910786b | 27 | * Do not attempt to use it directly. @headername{atomic} |
afd88205 BK |
28 | */ |
29 | ||
afd88205 BK |
30 | #ifndef _GLIBCXX_ATOMIC_BASE_H |
31 | #define _GLIBCXX_ATOMIC_BASE_H 1 | |
32 | ||
94a86be0 BK |
33 | #pragma GCC system_header |
34 | ||
35 | #include <bits/c++config.h> | |
94a86be0 | 36 | #include <stdint.h> |
a152e96f | 37 | #include <bits/atomic_lockfree_defines.h> |
a90fe12c | 38 | #include <bits/move.h> |
94a86be0 | 39 | |
83a1beee TR |
40 | #if __cplusplus > 201703L |
41 | #include <bits/atomic_wait.h> | |
42 | #endif | |
43 | ||
a062bb4b | 44 | #ifndef _GLIBCXX_ALWAYS_INLINE |
85d44192 | 45 | #define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__)) |
a062bb4b AK |
46 | #endif |
47 | ||
12ffa228 BK |
48 | namespace std _GLIBCXX_VISIBILITY(default) |
49 | { | |
50 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
afd88205 BK |
51 | |
52 | /** | |
53 | * @defgroup atomics Atomics | |
54 | * | |
55 | * Components for performing atomic operations. | |
56 | * @{ | |
57 | */ | |
58 | ||
59 | /// Enumeration for memory_order | |
94014ee9 ESR |
60 | #if __cplusplus > 201703L |
61 | enum class memory_order : int | |
62 | { | |
63 | relaxed, | |
64 | consume, | |
65 | acquire, | |
66 | release, | |
67 | acq_rel, | |
68 | seq_cst | |
69 | }; | |
70 | ||
71 | inline constexpr memory_order memory_order_relaxed = memory_order::relaxed; | |
72 | inline constexpr memory_order memory_order_consume = memory_order::consume; | |
73 | inline constexpr memory_order memory_order_acquire = memory_order::acquire; | |
74 | inline constexpr memory_order memory_order_release = memory_order::release; | |
75 | inline constexpr memory_order memory_order_acq_rel = memory_order::acq_rel; | |
76 | inline constexpr memory_order memory_order_seq_cst = memory_order::seq_cst; | |
77 | #else | |
afd88205 BK |
78 | typedef enum memory_order |
79 | { | |
80 | memory_order_relaxed, | |
81 | memory_order_consume, | |
82 | memory_order_acquire, | |
83 | memory_order_release, | |
84 | memory_order_acq_rel, | |
85 | memory_order_seq_cst | |
86 | } memory_order; | |
94014ee9 | 87 | #endif |
afd88205 | 88 | |
d76b6ea4 AK |
89 | enum __memory_order_modifier |
90 | { | |
91 | __memory_order_mask = 0x0ffff, | |
92 | __memory_order_modifier_mask = 0xffff0000, | |
93 | __memory_order_hle_acquire = 0x10000, | |
94 | __memory_order_hle_release = 0x20000 | |
95 | }; | |
96 | ||
97 | constexpr memory_order | |
98 | operator|(memory_order __m, __memory_order_modifier __mod) | |
99 | { | |
94014ee9 | 100 | return memory_order(int(__m) | int(__mod)); |
d76b6ea4 AK |
101 | } |
102 | ||
103 | constexpr memory_order | |
104 | operator&(memory_order __m, __memory_order_modifier __mod) | |
105 | { | |
94014ee9 | 106 | return memory_order(int(__m) & int(__mod)); |
d76b6ea4 AK |
107 | } |
108 | ||
3d0c32fe JW |
109 | // Drop release ordering as per [atomics.types.operations.req]/21 |
110 | constexpr memory_order | |
d76b6ea4 | 111 | __cmpexch_failure_order2(memory_order __m) noexcept |
94a86be0 | 112 | { |
3d0c32fe JW |
113 | return __m == memory_order_acq_rel ? memory_order_acquire |
114 | : __m == memory_order_release ? memory_order_relaxed : __m; | |
94a86be0 BK |
115 | } |
116 | ||
d76b6ea4 AK |
117 | constexpr memory_order |
118 | __cmpexch_failure_order(memory_order __m) noexcept | |
119 | { | |
120 | return memory_order(__cmpexch_failure_order2(__m & __memory_order_mask) | |
94014ee9 | 121 | | __memory_order_modifier(__m & __memory_order_modifier_mask)); |
d76b6ea4 AK |
122 | } |
123 | ||
a062bb4b | 124 | _GLIBCXX_ALWAYS_INLINE void |
d660c35e | 125 | atomic_thread_fence(memory_order __m) noexcept |
94014ee9 | 126 | { __atomic_thread_fence(int(__m)); } |
036e0d4f | 127 | |
a062bb4b | 128 | _GLIBCXX_ALWAYS_INLINE void |
d660c35e | 129 | atomic_signal_fence(memory_order __m) noexcept |
94014ee9 | 130 | { __atomic_signal_fence(int(__m)); } |
036e0d4f | 131 | |
94a86be0 BK |
132 | /// kill_dependency |
133 | template<typename _Tp> | |
134 | inline _Tp | |
bdc05efb | 135 | kill_dependency(_Tp __y) noexcept |
94a86be0 | 136 | { |
c2ac0d63 PC |
137 | _Tp __ret(__y); |
138 | return __ret; | |
94a86be0 BK |
139 | } |
140 | ||
94a86be0 | 141 | // Base types for atomics. |
86951993 AM |
142 | template<typename _IntTp> |
143 | struct __atomic_base; | |
94a86be0 | 144 | |
e4379a93 JW |
145 | #if __cplusplus <= 201703L |
146 | # define _GLIBCXX20_INIT(I) | |
147 | #else | |
148 | # define __cpp_lib_atomic_value_initialization 201911L | |
149 | # define _GLIBCXX20_INIT(I) = I | |
150 | #endif | |
94a86be0 | 151 | |
94a86be0 BK |
152 | #define ATOMIC_VAR_INIT(_VI) { _VI } |
153 | ||
154 | template<typename _Tp> | |
155 | struct atomic; | |
afd88205 | 156 | |
036e0d4f BK |
157 | template<typename _Tp> |
158 | struct atomic<_Tp*>; | |
159 | ||
a26f0501 JW |
160 | /* The target's "set" value for test-and-set may not be exactly 1. */ |
161 | #if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1 | |
162 | typedef bool __atomic_flag_data_type; | |
163 | #else | |
164 | typedef unsigned char __atomic_flag_data_type; | |
165 | #endif | |
86951993 AM |
166 | |
167 | /** | |
168 | * @brief Base type for atomic_flag. | |
169 | * | |
170 | * Base type is POD with data, allowing atomic_flag to derive from | |
171 | * it and meet the standard layout type requirement. In addition to | |
64e1ab11 | 172 | * compatibility with a C interface, this allows different |
86951993 AM |
173 | * implementations of atomic_flag to use the same atomic operation |
174 | * functions, via a standard conversion to the __atomic_flag_base | |
175 | * argument. | |
176 | */ | |
177 | _GLIBCXX_BEGIN_EXTERN_C | |
178 | ||
179 | struct __atomic_flag_base | |
180 | { | |
e4379a93 | 181 | __atomic_flag_data_type _M_i _GLIBCXX20_INIT({}); |
86951993 AM |
182 | }; |
183 | ||
184 | _GLIBCXX_END_EXTERN_C | |
185 | ||
e29137fe | 186 | #define ATOMIC_FLAG_INIT { 0 } |
86951993 AM |
187 | |
188 | /// atomic_flag | |
189 | struct atomic_flag : public __atomic_flag_base | |
190 | { | |
191 | atomic_flag() noexcept = default; | |
192 | ~atomic_flag() noexcept = default; | |
193 | atomic_flag(const atomic_flag&) = delete; | |
194 | atomic_flag& operator=(const atomic_flag&) = delete; | |
195 | atomic_flag& operator=(const atomic_flag&) volatile = delete; | |
196 | ||
197 | // Conversion to ATOMIC_FLAG_INIT. | |
e29137fe | 198 | constexpr atomic_flag(bool __i) noexcept |
a26f0501 | 199 | : __atomic_flag_base{ _S_init(__i) } |
e29137fe | 200 | { } |
86951993 | 201 | |
a062bb4b | 202 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
203 | test_and_set(memory_order __m = memory_order_seq_cst) noexcept |
204 | { | |
94014ee9 | 205 | return __atomic_test_and_set (&_M_i, int(__m)); |
86951993 AM |
206 | } |
207 | ||
a062bb4b | 208 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
209 | test_and_set(memory_order __m = memory_order_seq_cst) volatile noexcept |
210 | { | |
94014ee9 | 211 | return __atomic_test_and_set (&_M_i, int(__m)); |
86951993 AM |
212 | } |
213 | ||
491ba663 UD |
214 | #if __cplusplus > 201703L |
215 | #define __cpp_lib_atomic_flag_test 201907L | |
216 | ||
217 | _GLIBCXX_ALWAYS_INLINE bool | |
17412a74 | 218 | test(memory_order __m = memory_order_seq_cst) const noexcept |
491ba663 UD |
219 | { |
220 | __atomic_flag_data_type __v; | |
221 | __atomic_load(&_M_i, &__v, int(__m)); | |
222 | return __v == __GCC_ATOMIC_TEST_AND_SET_TRUEVAL; | |
223 | } | |
224 | ||
225 | _GLIBCXX_ALWAYS_INLINE bool | |
17412a74 | 226 | test(memory_order __m = memory_order_seq_cst) const volatile noexcept |
491ba663 UD |
227 | { |
228 | __atomic_flag_data_type __v; | |
229 | __atomic_load(&_M_i, &__v, int(__m)); | |
230 | return __v == __GCC_ATOMIC_TEST_AND_SET_TRUEVAL; | |
231 | } | |
83a1beee | 232 | |
6591e422 | 233 | #if __cpp_lib_atomic_wait |
83a1beee TR |
234 | _GLIBCXX_ALWAYS_INLINE void |
235 | wait(bool __old, | |
236 | memory_order __m = memory_order_seq_cst) const noexcept | |
237 | { | |
62d19588 | 238 | std::__atomic_wait(&_M_i, static_cast<__atomic_flag_data_type>(__old), |
83a1beee TR |
239 | [__m, this, __old]() |
240 | { return this->test(__m) != __old; }); | |
241 | } | |
242 | ||
243 | // TODO add const volatile overload | |
244 | ||
245 | _GLIBCXX_ALWAYS_INLINE void | |
246 | notify_one() const noexcept | |
247 | { std::__atomic_notify(&_M_i, false); } | |
248 | ||
249 | // TODO add const volatile overload | |
250 | ||
251 | _GLIBCXX_ALWAYS_INLINE void | |
252 | notify_all() const noexcept | |
253 | { std::__atomic_notify(&_M_i, true); } | |
254 | ||
255 | // TODO add const volatile overload | |
6591e422 | 256 | #endif // __cpp_lib_atomic_wait |
491ba663 UD |
257 | #endif // C++20 |
258 | ||
a062bb4b | 259 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
260 | clear(memory_order __m = memory_order_seq_cst) noexcept |
261 | { | |
2b4cc19b KK |
262 | memory_order __b __attribute__ ((__unused__)) |
263 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
264 | __glibcxx_assert(__b != memory_order_consume); |
265 | __glibcxx_assert(__b != memory_order_acquire); | |
266 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 267 | |
94014ee9 | 268 | __atomic_clear (&_M_i, int(__m)); |
86951993 AM |
269 | } |
270 | ||
a062bb4b | 271 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
272 | clear(memory_order __m = memory_order_seq_cst) volatile noexcept |
273 | { | |
2b4cc19b KK |
274 | memory_order __b __attribute__ ((__unused__)) |
275 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
276 | __glibcxx_assert(__b != memory_order_consume); |
277 | __glibcxx_assert(__b != memory_order_acquire); | |
278 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 279 | |
94014ee9 | 280 | __atomic_clear (&_M_i, int(__m)); |
86951993 | 281 | } |
a26f0501 JW |
282 | |
283 | private: | |
284 | static constexpr __atomic_flag_data_type | |
285 | _S_init(bool __i) | |
286 | { return __i ? __GCC_ATOMIC_TEST_AND_SET_TRUEVAL : 0; } | |
86951993 AM |
287 | }; |
288 | ||
289 | ||
290 | /// Base class for atomic integrals. | |
291 | // | |
292 | // For each of the integral types, define atomic_[integral type] struct | |
293 | // | |
294 | // atomic_bool bool | |
295 | // atomic_char char | |
296 | // atomic_schar signed char | |
297 | // atomic_uchar unsigned char | |
298 | // atomic_short short | |
299 | // atomic_ushort unsigned short | |
300 | // atomic_int int | |
301 | // atomic_uint unsigned int | |
302 | // atomic_long long | |
303 | // atomic_ulong unsigned long | |
304 | // atomic_llong long long | |
305 | // atomic_ullong unsigned long long | |
c124af93 | 306 | // atomic_char8_t char8_t |
86951993 AM |
307 | // atomic_char16_t char16_t |
308 | // atomic_char32_t char32_t | |
309 | // atomic_wchar_t wchar_t | |
310 | // | |
311 | // NB: Assuming _ITp is an integral scalar type that is 1, 2, 4, or | |
312 | // 8 bytes, since that is what GCC built-in functions for atomic | |
313 | // memory access expect. | |
314 | template<typename _ITp> | |
315 | struct __atomic_base | |
316 | { | |
25999a11 JW |
317 | using value_type = _ITp; |
318 | using difference_type = value_type; | |
319 | ||
86951993 AM |
320 | private: |
321 | typedef _ITp __int_type; | |
322 | ||
4cbaaa45 JW |
323 | static constexpr int _S_alignment = |
324 | sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp); | |
325 | ||
e4379a93 | 326 | alignas(_S_alignment) __int_type _M_i _GLIBCXX20_INIT(0); |
86951993 AM |
327 | |
328 | public: | |
329 | __atomic_base() noexcept = default; | |
330 | ~__atomic_base() noexcept = default; | |
331 | __atomic_base(const __atomic_base&) = delete; | |
332 | __atomic_base& operator=(const __atomic_base&) = delete; | |
333 | __atomic_base& operator=(const __atomic_base&) volatile = delete; | |
334 | ||
335 | // Requires __int_type convertible to _M_i. | |
336 | constexpr __atomic_base(__int_type __i) noexcept : _M_i (__i) { } | |
337 | ||
338 | operator __int_type() const noexcept | |
339 | { return load(); } | |
340 | ||
341 | operator __int_type() const volatile noexcept | |
342 | { return load(); } | |
343 | ||
344 | __int_type | |
345 | operator=(__int_type __i) noexcept | |
346 | { | |
347 | store(__i); | |
348 | return __i; | |
349 | } | |
350 | ||
351 | __int_type | |
352 | operator=(__int_type __i) volatile noexcept | |
353 | { | |
354 | store(__i); | |
355 | return __i; | |
356 | } | |
357 | ||
358 | __int_type | |
359 | operator++(int) noexcept | |
360 | { return fetch_add(1); } | |
361 | ||
362 | __int_type | |
363 | operator++(int) volatile noexcept | |
364 | { return fetch_add(1); } | |
365 | ||
366 | __int_type | |
367 | operator--(int) noexcept | |
368 | { return fetch_sub(1); } | |
369 | ||
370 | __int_type | |
371 | operator--(int) volatile noexcept | |
372 | { return fetch_sub(1); } | |
373 | ||
374 | __int_type | |
375 | operator++() noexcept | |
8b9482b2 | 376 | { return __atomic_add_fetch(&_M_i, 1, int(memory_order_seq_cst)); } |
86951993 AM |
377 | |
378 | __int_type | |
379 | operator++() volatile noexcept | |
8b9482b2 | 380 | { return __atomic_add_fetch(&_M_i, 1, int(memory_order_seq_cst)); } |
86951993 AM |
381 | |
382 | __int_type | |
383 | operator--() noexcept | |
8b9482b2 | 384 | { return __atomic_sub_fetch(&_M_i, 1, int(memory_order_seq_cst)); } |
86951993 AM |
385 | |
386 | __int_type | |
387 | operator--() volatile noexcept | |
8b9482b2 | 388 | { return __atomic_sub_fetch(&_M_i, 1, int(memory_order_seq_cst)); } |
86951993 AM |
389 | |
390 | __int_type | |
391 | operator+=(__int_type __i) noexcept | |
8b9482b2 | 392 | { return __atomic_add_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
393 | |
394 | __int_type | |
395 | operator+=(__int_type __i) volatile noexcept | |
8b9482b2 | 396 | { return __atomic_add_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
397 | |
398 | __int_type | |
399 | operator-=(__int_type __i) noexcept | |
8b9482b2 | 400 | { return __atomic_sub_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
401 | |
402 | __int_type | |
403 | operator-=(__int_type __i) volatile noexcept | |
8b9482b2 | 404 | { return __atomic_sub_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
405 | |
406 | __int_type | |
407 | operator&=(__int_type __i) noexcept | |
8b9482b2 | 408 | { return __atomic_and_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
409 | |
410 | __int_type | |
411 | operator&=(__int_type __i) volatile noexcept | |
8b9482b2 | 412 | { return __atomic_and_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
413 | |
414 | __int_type | |
415 | operator|=(__int_type __i) noexcept | |
8b9482b2 | 416 | { return __atomic_or_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
417 | |
418 | __int_type | |
419 | operator|=(__int_type __i) volatile noexcept | |
8b9482b2 | 420 | { return __atomic_or_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
421 | |
422 | __int_type | |
423 | operator^=(__int_type __i) noexcept | |
8b9482b2 | 424 | { return __atomic_xor_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
425 | |
426 | __int_type | |
427 | operator^=(__int_type __i) volatile noexcept | |
8b9482b2 | 428 | { return __atomic_xor_fetch(&_M_i, __i, int(memory_order_seq_cst)); } |
86951993 AM |
429 | |
430 | bool | |
431 | is_lock_free() const noexcept | |
8be56851 | 432 | { |
310055e7 JW |
433 | // Use a fake, minimally aligned pointer. |
434 | return __atomic_is_lock_free(sizeof(_M_i), | |
63100c54 | 435 | reinterpret_cast<void *>(-_S_alignment)); |
8be56851 | 436 | } |
86951993 AM |
437 | |
438 | bool | |
439 | is_lock_free() const volatile noexcept | |
8be56851 | 440 | { |
310055e7 JW |
441 | // Use a fake, minimally aligned pointer. |
442 | return __atomic_is_lock_free(sizeof(_M_i), | |
63100c54 | 443 | reinterpret_cast<void *>(-_S_alignment)); |
8be56851 | 444 | } |
86951993 | 445 | |
a062bb4b | 446 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
447 | store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept |
448 | { | |
2b4cc19b KK |
449 | memory_order __b __attribute__ ((__unused__)) |
450 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
451 | __glibcxx_assert(__b != memory_order_acquire); |
452 | __glibcxx_assert(__b != memory_order_acq_rel); | |
453 | __glibcxx_assert(__b != memory_order_consume); | |
86951993 | 454 | |
94014ee9 | 455 | __atomic_store_n(&_M_i, __i, int(__m)); |
86951993 AM |
456 | } |
457 | ||
a062bb4b | 458 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
459 | store(__int_type __i, |
460 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
461 | { | |
2b4cc19b KK |
462 | memory_order __b __attribute__ ((__unused__)) |
463 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
464 | __glibcxx_assert(__b != memory_order_acquire); |
465 | __glibcxx_assert(__b != memory_order_acq_rel); | |
466 | __glibcxx_assert(__b != memory_order_consume); | |
86951993 | 467 | |
94014ee9 | 468 | __atomic_store_n(&_M_i, __i, int(__m)); |
86951993 AM |
469 | } |
470 | ||
a062bb4b | 471 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
472 | load(memory_order __m = memory_order_seq_cst) const noexcept |
473 | { | |
2b4cc19b KK |
474 | memory_order __b __attribute__ ((__unused__)) |
475 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
476 | __glibcxx_assert(__b != memory_order_release); |
477 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 478 | |
94014ee9 | 479 | return __atomic_load_n(&_M_i, int(__m)); |
86951993 AM |
480 | } |
481 | ||
a062bb4b | 482 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
483 | load(memory_order __m = memory_order_seq_cst) const volatile noexcept |
484 | { | |
2b4cc19b KK |
485 | memory_order __b __attribute__ ((__unused__)) |
486 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
487 | __glibcxx_assert(__b != memory_order_release); |
488 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 489 | |
94014ee9 | 490 | return __atomic_load_n(&_M_i, int(__m)); |
86951993 AM |
491 | } |
492 | ||
a062bb4b | 493 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
494 | exchange(__int_type __i, |
495 | memory_order __m = memory_order_seq_cst) noexcept | |
496 | { | |
94014ee9 | 497 | return __atomic_exchange_n(&_M_i, __i, int(__m)); |
86951993 AM |
498 | } |
499 | ||
500 | ||
a062bb4b | 501 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
502 | exchange(__int_type __i, |
503 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
504 | { | |
94014ee9 | 505 | return __atomic_exchange_n(&_M_i, __i, int(__m)); |
86951993 AM |
506 | } |
507 | ||
a062bb4b | 508 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
509 | compare_exchange_weak(__int_type& __i1, __int_type __i2, |
510 | memory_order __m1, memory_order __m2) noexcept | |
511 | { | |
2b4cc19b KK |
512 | memory_order __b2 __attribute__ ((__unused__)) |
513 | = __m2 & __memory_order_mask; | |
514 | memory_order __b1 __attribute__ ((__unused__)) | |
515 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
516 | __glibcxx_assert(__b2 != memory_order_release); |
517 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
518 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 519 | |
94014ee9 ESR |
520 | return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, |
521 | int(__m1), int(__m2)); | |
86951993 AM |
522 | } |
523 | ||
a062bb4b | 524 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
525 | compare_exchange_weak(__int_type& __i1, __int_type __i2, |
526 | memory_order __m1, | |
527 | memory_order __m2) volatile noexcept | |
528 | { | |
2b4cc19b KK |
529 | memory_order __b2 __attribute__ ((__unused__)) |
530 | = __m2 & __memory_order_mask; | |
531 | memory_order __b1 __attribute__ ((__unused__)) | |
532 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
533 | __glibcxx_assert(__b2 != memory_order_release); |
534 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
535 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 536 | |
94014ee9 ESR |
537 | return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, |
538 | int(__m1), int(__m2)); | |
86951993 AM |
539 | } |
540 | ||
a062bb4b | 541 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
542 | compare_exchange_weak(__int_type& __i1, __int_type __i2, |
543 | memory_order __m = memory_order_seq_cst) noexcept | |
544 | { | |
545 | return compare_exchange_weak(__i1, __i2, __m, | |
3d0c32fe | 546 | __cmpexch_failure_order(__m)); |
86951993 AM |
547 | } |
548 | ||
a062bb4b | 549 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
550 | compare_exchange_weak(__int_type& __i1, __int_type __i2, |
551 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
552 | { | |
553 | return compare_exchange_weak(__i1, __i2, __m, | |
3d0c32fe | 554 | __cmpexch_failure_order(__m)); |
86951993 AM |
555 | } |
556 | ||
a062bb4b | 557 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
558 | compare_exchange_strong(__int_type& __i1, __int_type __i2, |
559 | memory_order __m1, memory_order __m2) noexcept | |
560 | { | |
2b4cc19b KK |
561 | memory_order __b2 __attribute__ ((__unused__)) |
562 | = __m2 & __memory_order_mask; | |
563 | memory_order __b1 __attribute__ ((__unused__)) | |
564 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
565 | __glibcxx_assert(__b2 != memory_order_release); |
566 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
567 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 568 | |
94014ee9 ESR |
569 | return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, |
570 | int(__m1), int(__m2)); | |
86951993 AM |
571 | } |
572 | ||
a062bb4b | 573 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
574 | compare_exchange_strong(__int_type& __i1, __int_type __i2, |
575 | memory_order __m1, | |
576 | memory_order __m2) volatile noexcept | |
577 | { | |
2b4cc19b KK |
578 | memory_order __b2 __attribute__ ((__unused__)) |
579 | = __m2 & __memory_order_mask; | |
580 | memory_order __b1 __attribute__ ((__unused__)) | |
581 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
582 | |
583 | __glibcxx_assert(__b2 != memory_order_release); | |
584 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
585 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 586 | |
94014ee9 ESR |
587 | return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, |
588 | int(__m1), int(__m2)); | |
86951993 AM |
589 | } |
590 | ||
a062bb4b | 591 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
592 | compare_exchange_strong(__int_type& __i1, __int_type __i2, |
593 | memory_order __m = memory_order_seq_cst) noexcept | |
594 | { | |
595 | return compare_exchange_strong(__i1, __i2, __m, | |
3d0c32fe | 596 | __cmpexch_failure_order(__m)); |
86951993 AM |
597 | } |
598 | ||
a062bb4b | 599 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
600 | compare_exchange_strong(__int_type& __i1, __int_type __i2, |
601 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
602 | { | |
603 | return compare_exchange_strong(__i1, __i2, __m, | |
3d0c32fe | 604 | __cmpexch_failure_order(__m)); |
86951993 AM |
605 | } |
606 | ||
6591e422 | 607 | #if __cpp_lib_atomic_wait |
83a1beee TR |
608 | _GLIBCXX_ALWAYS_INLINE void |
609 | wait(__int_type __old, | |
610 | memory_order __m = memory_order_seq_cst) const noexcept | |
611 | { | |
612 | std::__atomic_wait(&_M_i, __old, | |
613 | [__m, this, __old] | |
614 | { return this->load(__m) != __old; }); | |
615 | } | |
616 | ||
617 | // TODO add const volatile overload | |
618 | ||
619 | _GLIBCXX_ALWAYS_INLINE void | |
620 | notify_one() const noexcept | |
621 | { std::__atomic_notify(&_M_i, false); } | |
622 | ||
623 | // TODO add const volatile overload | |
624 | ||
625 | _GLIBCXX_ALWAYS_INLINE void | |
626 | notify_all() const noexcept | |
627 | { std::__atomic_notify(&_M_i, true); } | |
628 | ||
629 | // TODO add const volatile overload | |
6591e422 | 630 | #endif // __cpp_lib_atomic_wait |
83a1beee | 631 | |
a062bb4b | 632 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
633 | fetch_add(__int_type __i, |
634 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 635 | { return __atomic_fetch_add(&_M_i, __i, int(__m)); } |
86951993 | 636 | |
a062bb4b | 637 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
638 | fetch_add(__int_type __i, |
639 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 640 | { return __atomic_fetch_add(&_M_i, __i, int(__m)); } |
86951993 | 641 | |
a062bb4b | 642 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
643 | fetch_sub(__int_type __i, |
644 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 645 | { return __atomic_fetch_sub(&_M_i, __i, int(__m)); } |
86951993 | 646 | |
a062bb4b | 647 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
648 | fetch_sub(__int_type __i, |
649 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 650 | { return __atomic_fetch_sub(&_M_i, __i, int(__m)); } |
86951993 | 651 | |
a062bb4b | 652 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
653 | fetch_and(__int_type __i, |
654 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 655 | { return __atomic_fetch_and(&_M_i, __i, int(__m)); } |
86951993 | 656 | |
a062bb4b | 657 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
658 | fetch_and(__int_type __i, |
659 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 660 | { return __atomic_fetch_and(&_M_i, __i, int(__m)); } |
86951993 | 661 | |
a062bb4b | 662 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
663 | fetch_or(__int_type __i, |
664 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 665 | { return __atomic_fetch_or(&_M_i, __i, int(__m)); } |
86951993 | 666 | |
a062bb4b | 667 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
668 | fetch_or(__int_type __i, |
669 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 670 | { return __atomic_fetch_or(&_M_i, __i, int(__m)); } |
86951993 | 671 | |
a062bb4b | 672 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
673 | fetch_xor(__int_type __i, |
674 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 675 | { return __atomic_fetch_xor(&_M_i, __i, int(__m)); } |
86951993 | 676 | |
a062bb4b | 677 | _GLIBCXX_ALWAYS_INLINE __int_type |
86951993 AM |
678 | fetch_xor(__int_type __i, |
679 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 680 | { return __atomic_fetch_xor(&_M_i, __i, int(__m)); } |
86951993 AM |
681 | }; |
682 | ||
683 | ||
684 | /// Partial specialization for pointer types. | |
685 | template<typename _PTp> | |
686 | struct __atomic_base<_PTp*> | |
687 | { | |
688 | private: | |
689 | typedef _PTp* __pointer_type; | |
690 | ||
e4379a93 | 691 | __pointer_type _M_p _GLIBCXX20_INIT(nullptr); |
86951993 | 692 | |
40357398 BK |
693 | // Factored out to facilitate explicit specialization. |
694 | constexpr ptrdiff_t | |
260d16c8 | 695 | _M_type_size(ptrdiff_t __d) const { return __d * sizeof(_PTp); } |
40357398 BK |
696 | |
697 | constexpr ptrdiff_t | |
260d16c8 | 698 | _M_type_size(ptrdiff_t __d) const volatile { return __d * sizeof(_PTp); } |
40357398 | 699 | |
86951993 AM |
700 | public: |
701 | __atomic_base() noexcept = default; | |
702 | ~__atomic_base() noexcept = default; | |
703 | __atomic_base(const __atomic_base&) = delete; | |
704 | __atomic_base& operator=(const __atomic_base&) = delete; | |
705 | __atomic_base& operator=(const __atomic_base&) volatile = delete; | |
706 | ||
707 | // Requires __pointer_type convertible to _M_p. | |
708 | constexpr __atomic_base(__pointer_type __p) noexcept : _M_p (__p) { } | |
709 | ||
710 | operator __pointer_type() const noexcept | |
711 | { return load(); } | |
712 | ||
713 | operator __pointer_type() const volatile noexcept | |
714 | { return load(); } | |
715 | ||
716 | __pointer_type | |
717 | operator=(__pointer_type __p) noexcept | |
718 | { | |
719 | store(__p); | |
720 | return __p; | |
721 | } | |
722 | ||
723 | __pointer_type | |
724 | operator=(__pointer_type __p) volatile noexcept | |
725 | { | |
726 | store(__p); | |
727 | return __p; | |
728 | } | |
729 | ||
730 | __pointer_type | |
731 | operator++(int) noexcept | |
732 | { return fetch_add(1); } | |
733 | ||
734 | __pointer_type | |
735 | operator++(int) volatile noexcept | |
736 | { return fetch_add(1); } | |
737 | ||
738 | __pointer_type | |
739 | operator--(int) noexcept | |
740 | { return fetch_sub(1); } | |
741 | ||
742 | __pointer_type | |
743 | operator--(int) volatile noexcept | |
744 | { return fetch_sub(1); } | |
745 | ||
746 | __pointer_type | |
747 | operator++() noexcept | |
40357398 | 748 | { return __atomic_add_fetch(&_M_p, _M_type_size(1), |
8b9482b2 | 749 | int(memory_order_seq_cst)); } |
86951993 AM |
750 | |
751 | __pointer_type | |
752 | operator++() volatile noexcept | |
40357398 | 753 | { return __atomic_add_fetch(&_M_p, _M_type_size(1), |
8b9482b2 | 754 | int(memory_order_seq_cst)); } |
86951993 AM |
755 | |
756 | __pointer_type | |
757 | operator--() noexcept | |
40357398 | 758 | { return __atomic_sub_fetch(&_M_p, _M_type_size(1), |
8b9482b2 | 759 | int(memory_order_seq_cst)); } |
86951993 AM |
760 | |
761 | __pointer_type | |
762 | operator--() volatile noexcept | |
40357398 | 763 | { return __atomic_sub_fetch(&_M_p, _M_type_size(1), |
8b9482b2 | 764 | int(memory_order_seq_cst)); } |
86951993 AM |
765 | |
766 | __pointer_type | |
767 | operator+=(ptrdiff_t __d) noexcept | |
40357398 | 768 | { return __atomic_add_fetch(&_M_p, _M_type_size(__d), |
8b9482b2 | 769 | int(memory_order_seq_cst)); } |
86951993 AM |
770 | |
771 | __pointer_type | |
772 | operator+=(ptrdiff_t __d) volatile noexcept | |
40357398 | 773 | { return __atomic_add_fetch(&_M_p, _M_type_size(__d), |
8b9482b2 | 774 | int(memory_order_seq_cst)); } |
86951993 AM |
775 | |
776 | __pointer_type | |
777 | operator-=(ptrdiff_t __d) noexcept | |
40357398 | 778 | { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), |
8b9482b2 | 779 | int(memory_order_seq_cst)); } |
86951993 AM |
780 | |
781 | __pointer_type | |
782 | operator-=(ptrdiff_t __d) volatile noexcept | |
40357398 | 783 | { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), |
8b9482b2 | 784 | int(memory_order_seq_cst)); } |
86951993 AM |
785 | |
786 | bool | |
787 | is_lock_free() const noexcept | |
8be56851 RH |
788 | { |
789 | // Produce a fake, minimally aligned pointer. | |
310055e7 JW |
790 | return __atomic_is_lock_free(sizeof(_M_p), |
791 | reinterpret_cast<void *>(-__alignof(_M_p))); | |
8be56851 | 792 | } |
86951993 AM |
793 | |
794 | bool | |
795 | is_lock_free() const volatile noexcept | |
8be56851 RH |
796 | { |
797 | // Produce a fake, minimally aligned pointer. | |
310055e7 JW |
798 | return __atomic_is_lock_free(sizeof(_M_p), |
799 | reinterpret_cast<void *>(-__alignof(_M_p))); | |
8be56851 | 800 | } |
86951993 | 801 | |
a062bb4b | 802 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
803 | store(__pointer_type __p, |
804 | memory_order __m = memory_order_seq_cst) noexcept | |
805 | { | |
2b4cc19b KK |
806 | memory_order __b __attribute__ ((__unused__)) |
807 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
808 | |
809 | __glibcxx_assert(__b != memory_order_acquire); | |
810 | __glibcxx_assert(__b != memory_order_acq_rel); | |
811 | __glibcxx_assert(__b != memory_order_consume); | |
86951993 | 812 | |
94014ee9 | 813 | __atomic_store_n(&_M_p, __p, int(__m)); |
86951993 AM |
814 | } |
815 | ||
a062bb4b | 816 | _GLIBCXX_ALWAYS_INLINE void |
86951993 AM |
817 | store(__pointer_type __p, |
818 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
819 | { | |
2b4cc19b KK |
820 | memory_order __b __attribute__ ((__unused__)) |
821 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
822 | __glibcxx_assert(__b != memory_order_acquire); |
823 | __glibcxx_assert(__b != memory_order_acq_rel); | |
824 | __glibcxx_assert(__b != memory_order_consume); | |
86951993 | 825 | |
94014ee9 | 826 | __atomic_store_n(&_M_p, __p, int(__m)); |
86951993 AM |
827 | } |
828 | ||
a062bb4b | 829 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
830 | load(memory_order __m = memory_order_seq_cst) const noexcept |
831 | { | |
2b4cc19b KK |
832 | memory_order __b __attribute__ ((__unused__)) |
833 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
834 | __glibcxx_assert(__b != memory_order_release); |
835 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 836 | |
94014ee9 | 837 | return __atomic_load_n(&_M_p, int(__m)); |
86951993 AM |
838 | } |
839 | ||
a062bb4b | 840 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
841 | load(memory_order __m = memory_order_seq_cst) const volatile noexcept |
842 | { | |
2b4cc19b KK |
843 | memory_order __b __attribute__ ((__unused__)) |
844 | = __m & __memory_order_mask; | |
d76b6ea4 AK |
845 | __glibcxx_assert(__b != memory_order_release); |
846 | __glibcxx_assert(__b != memory_order_acq_rel); | |
86951993 | 847 | |
94014ee9 | 848 | return __atomic_load_n(&_M_p, int(__m)); |
86951993 AM |
849 | } |
850 | ||
a062bb4b | 851 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
852 | exchange(__pointer_type __p, |
853 | memory_order __m = memory_order_seq_cst) noexcept | |
854 | { | |
94014ee9 | 855 | return __atomic_exchange_n(&_M_p, __p, int(__m)); |
86951993 AM |
856 | } |
857 | ||
858 | ||
a062bb4b | 859 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
860 | exchange(__pointer_type __p, |
861 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
862 | { | |
94014ee9 | 863 | return __atomic_exchange_n(&_M_p, __p, int(__m)); |
86951993 AM |
864 | } |
865 | ||
a062bb4b | 866 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
867 | compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, |
868 | memory_order __m1, | |
869 | memory_order __m2) noexcept | |
870 | { | |
2b4cc19b KK |
871 | memory_order __b2 __attribute__ ((__unused__)) |
872 | = __m2 & __memory_order_mask; | |
873 | memory_order __b1 __attribute__ ((__unused__)) | |
874 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
875 | __glibcxx_assert(__b2 != memory_order_release); |
876 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
877 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 878 | |
94014ee9 ESR |
879 | return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, |
880 | int(__m1), int(__m2)); | |
86951993 AM |
881 | } |
882 | ||
a062bb4b | 883 | _GLIBCXX_ALWAYS_INLINE bool |
86951993 AM |
884 | compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, |
885 | memory_order __m1, | |
886 | memory_order __m2) volatile noexcept | |
887 | { | |
2b4cc19b KK |
888 | memory_order __b2 __attribute__ ((__unused__)) |
889 | = __m2 & __memory_order_mask; | |
890 | memory_order __b1 __attribute__ ((__unused__)) | |
891 | = __m1 & __memory_order_mask; | |
d76b6ea4 AK |
892 | |
893 | __glibcxx_assert(__b2 != memory_order_release); | |
894 | __glibcxx_assert(__b2 != memory_order_acq_rel); | |
895 | __glibcxx_assert(__b2 <= __b1); | |
86951993 | 896 | |
94014ee9 ESR |
897 | return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, |
898 | int(__m1), int(__m2)); | |
86951993 AM |
899 | } |
900 | ||
6591e422 | 901 | #if __cpp_lib_atomic_wait |
83a1beee TR |
902 | _GLIBCXX_ALWAYS_INLINE void |
903 | wait(__pointer_type __old, | |
904 | memory_order __m = memory_order_seq_cst) noexcept | |
905 | { | |
906 | std::__atomic_wait(&_M_p, __old, | |
907 | [__m, this, __old]() | |
908 | { return this->load(__m) != __old; }); | |
909 | } | |
910 | ||
911 | // TODO add const volatile overload | |
912 | ||
913 | _GLIBCXX_ALWAYS_INLINE void | |
914 | notify_one() const noexcept | |
915 | { std::__atomic_notify(&_M_p, false); } | |
916 | ||
917 | // TODO add const volatile overload | |
918 | ||
919 | _GLIBCXX_ALWAYS_INLINE void | |
920 | notify_all() const noexcept | |
921 | { std::__atomic_notify(&_M_p, true); } | |
922 | ||
923 | // TODO add const volatile overload | |
6591e422 | 924 | #endif // __cpp_lib_atomic_wait |
83a1beee | 925 | |
a062bb4b | 926 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
927 | fetch_add(ptrdiff_t __d, |
928 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 929 | { return __atomic_fetch_add(&_M_p, _M_type_size(__d), int(__m)); } |
86951993 | 930 | |
a062bb4b | 931 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
932 | fetch_add(ptrdiff_t __d, |
933 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 934 | { return __atomic_fetch_add(&_M_p, _M_type_size(__d), int(__m)); } |
86951993 | 935 | |
a062bb4b | 936 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
937 | fetch_sub(ptrdiff_t __d, |
938 | memory_order __m = memory_order_seq_cst) noexcept | |
94014ee9 | 939 | { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), int(__m)); } |
86951993 | 940 | |
a062bb4b | 941 | _GLIBCXX_ALWAYS_INLINE __pointer_type |
86951993 AM |
942 | fetch_sub(ptrdiff_t __d, |
943 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
94014ee9 | 944 | { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), int(__m)); } |
86951993 AM |
945 | }; |
946 | ||
a90fe12c JW |
947 | #if __cplusplus > 201703L |
948 | // Implementation details of atomic_ref and atomic<floating-point>. | |
949 | namespace __atomic_impl | |
950 | { | |
951 | // Remove volatile and create a non-deduced context for value arguments. | |
952 | template<typename _Tp> | |
953 | using _Val = remove_volatile_t<_Tp>; | |
954 | ||
955 | // As above, but for difference_type arguments. | |
956 | template<typename _Tp> | |
957 | using _Diff = conditional_t<is_pointer_v<_Tp>, ptrdiff_t, _Val<_Tp>>; | |
958 | ||
959 | template<size_t _Size, size_t _Align> | |
960 | _GLIBCXX_ALWAYS_INLINE bool | |
961 | is_lock_free() noexcept | |
962 | { | |
963 | // Produce a fake, minimally aligned pointer. | |
964 | return __atomic_is_lock_free(_Size, reinterpret_cast<void *>(-_Align)); | |
965 | } | |
966 | ||
967 | template<typename _Tp> | |
968 | _GLIBCXX_ALWAYS_INLINE void | |
969 | store(_Tp* __ptr, _Val<_Tp> __t, memory_order __m) noexcept | |
970 | { __atomic_store(__ptr, std::__addressof(__t), int(__m)); } | |
971 | ||
972 | template<typename _Tp> | |
e40b11a9 JW |
973 | _GLIBCXX_ALWAYS_INLINE _Val<_Tp> |
974 | load(const _Tp* __ptr, memory_order __m) noexcept | |
a90fe12c JW |
975 | { |
976 | alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; | |
e40b11a9 | 977 | auto* __dest = reinterpret_cast<_Val<_Tp>*>(__buf); |
a90fe12c JW |
978 | __atomic_load(__ptr, __dest, int(__m)); |
979 | return *__dest; | |
980 | } | |
981 | ||
982 | template<typename _Tp> | |
e40b11a9 | 983 | _GLIBCXX_ALWAYS_INLINE _Val<_Tp> |
a90fe12c JW |
984 | exchange(_Tp* __ptr, _Val<_Tp> __desired, memory_order __m) noexcept |
985 | { | |
986 | alignas(_Tp) unsigned char __buf[sizeof(_Tp)]; | |
e40b11a9 | 987 | auto* __dest = reinterpret_cast<_Val<_Tp>*>(__buf); |
a90fe12c JW |
988 | __atomic_exchange(__ptr, std::__addressof(__desired), __dest, int(__m)); |
989 | return *__dest; | |
990 | } | |
991 | ||
992 | template<typename _Tp> | |
993 | _GLIBCXX_ALWAYS_INLINE bool | |
994 | compare_exchange_weak(_Tp* __ptr, _Val<_Tp>& __expected, | |
995 | _Val<_Tp> __desired, memory_order __success, | |
996 | memory_order __failure) noexcept | |
997 | { | |
998 | return __atomic_compare_exchange(__ptr, std::__addressof(__expected), | |
999 | std::__addressof(__desired), true, | |
1000 | int(__success), int(__failure)); | |
1001 | } | |
1002 | ||
1003 | template<typename _Tp> | |
1004 | _GLIBCXX_ALWAYS_INLINE bool | |
1005 | compare_exchange_strong(_Tp* __ptr, _Val<_Tp>& __expected, | |
1006 | _Val<_Tp> __desired, memory_order __success, | |
1007 | memory_order __failure) noexcept | |
1008 | { | |
1009 | return __atomic_compare_exchange(__ptr, std::__addressof(__expected), | |
1010 | std::__addressof(__desired), false, | |
1011 | int(__success), int(__failure)); | |
1012 | } | |
1013 | ||
6591e422 | 1014 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1015 | template<typename _Tp> |
1016 | _GLIBCXX_ALWAYS_INLINE void | |
1017 | wait(const _Tp* __ptr, _Val<_Tp> __old, | |
1018 | memory_order __m = memory_order_seq_cst) noexcept | |
1019 | { | |
1020 | std::__atomic_wait(__ptr, __old, | |
1021 | [=]() { return load(__ptr, __m) == __old; }); | |
1022 | } | |
1023 | ||
1024 | // TODO add const volatile overload | |
1025 | ||
1026 | template<typename _Tp> | |
1027 | _GLIBCXX_ALWAYS_INLINE void | |
1028 | notify_one(const _Tp* __ptr) noexcept | |
1029 | { std::__atomic_notify(__ptr, false); } | |
1030 | ||
1031 | // TODO add const volatile overload | |
1032 | ||
1033 | template<typename _Tp> | |
1034 | _GLIBCXX_ALWAYS_INLINE void | |
1035 | notify_all(const _Tp* __ptr) noexcept | |
1036 | { std::__atomic_notify(__ptr, true); } | |
1037 | ||
1038 | // TODO add const volatile overload | |
6591e422 | 1039 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1040 | |
a90fe12c JW |
1041 | template<typename _Tp> |
1042 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1043 | fetch_add(_Tp* __ptr, _Diff<_Tp> __i, memory_order __m) noexcept | |
1044 | { return __atomic_fetch_add(__ptr, __i, int(__m)); } | |
1045 | ||
1046 | template<typename _Tp> | |
1047 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1048 | fetch_sub(_Tp* __ptr, _Diff<_Tp> __i, memory_order __m) noexcept | |
1049 | { return __atomic_fetch_sub(__ptr, __i, int(__m)); } | |
1050 | ||
1051 | template<typename _Tp> | |
1052 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1053 | fetch_and(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept | |
1054 | { return __atomic_fetch_and(__ptr, __i, int(__m)); } | |
1055 | ||
1056 | template<typename _Tp> | |
1057 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1058 | fetch_or(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept | |
1059 | { return __atomic_fetch_or(__ptr, __i, int(__m)); } | |
1060 | ||
1061 | template<typename _Tp> | |
1062 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1063 | fetch_xor(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept | |
1064 | { return __atomic_fetch_xor(__ptr, __i, int(__m)); } | |
1065 | ||
1066 | template<typename _Tp> | |
1067 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1068 | __add_fetch(_Tp* __ptr, _Diff<_Tp> __i) noexcept | |
1069 | { return __atomic_add_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } | |
1070 | ||
1071 | template<typename _Tp> | |
1072 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1073 | __sub_fetch(_Tp* __ptr, _Diff<_Tp> __i) noexcept | |
1074 | { return __atomic_sub_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } | |
1075 | ||
1076 | template<typename _Tp> | |
1077 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1078 | __and_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept | |
1079 | { return __atomic_and_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } | |
1080 | ||
1081 | template<typename _Tp> | |
1082 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1083 | __or_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept | |
1084 | { return __atomic_or_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } | |
1085 | ||
1086 | template<typename _Tp> | |
1087 | _GLIBCXX_ALWAYS_INLINE _Tp | |
1088 | __xor_fetch(_Tp* __ptr, _Val<_Tp> __i) noexcept | |
1089 | { return __atomic_xor_fetch(__ptr, __i, __ATOMIC_SEQ_CST); } | |
1090 | ||
1091 | template<typename _Tp> | |
1092 | _Tp | |
1093 | __fetch_add_flt(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept | |
1094 | { | |
1095 | _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); | |
1096 | _Val<_Tp> __newval = __oldval + __i; | |
1097 | while (!compare_exchange_weak(__ptr, __oldval, __newval, __m, | |
1098 | memory_order_relaxed)) | |
1099 | __newval = __oldval + __i; | |
1100 | return __oldval; | |
1101 | } | |
1102 | ||
1103 | template<typename _Tp> | |
1104 | _Tp | |
1105 | __fetch_sub_flt(_Tp* __ptr, _Val<_Tp> __i, memory_order __m) noexcept | |
1106 | { | |
1107 | _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); | |
1108 | _Val<_Tp> __newval = __oldval - __i; | |
1109 | while (!compare_exchange_weak(__ptr, __oldval, __newval, __m, | |
1110 | memory_order_relaxed)) | |
1111 | __newval = __oldval - __i; | |
1112 | return __oldval; | |
1113 | } | |
1114 | ||
1115 | template<typename _Tp> | |
1116 | _Tp | |
1117 | __add_fetch_flt(_Tp* __ptr, _Val<_Tp> __i) noexcept | |
1118 | { | |
1119 | _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); | |
1120 | _Val<_Tp> __newval = __oldval + __i; | |
1121 | while (!compare_exchange_weak(__ptr, __oldval, __newval, | |
1122 | memory_order_seq_cst, | |
1123 | memory_order_relaxed)) | |
1124 | __newval = __oldval + __i; | |
1125 | return __newval; | |
1126 | } | |
1127 | ||
1128 | template<typename _Tp> | |
1129 | _Tp | |
1130 | __sub_fetch_flt(_Tp* __ptr, _Val<_Tp> __i) noexcept | |
1131 | { | |
1132 | _Val<_Tp> __oldval = load(__ptr, memory_order_relaxed); | |
1133 | _Val<_Tp> __newval = __oldval - __i; | |
1134 | while (!compare_exchange_weak(__ptr, __oldval, __newval, | |
1135 | memory_order_seq_cst, | |
1136 | memory_order_relaxed)) | |
1137 | __newval = __oldval - __i; | |
1138 | return __newval; | |
1139 | } | |
1140 | } // namespace __atomic_impl | |
1141 | ||
1142 | // base class for atomic<floating-point-type> | |
1143 | template<typename _Fp> | |
1144 | struct __atomic_float | |
1145 | { | |
1146 | static_assert(is_floating_point_v<_Fp>); | |
1147 | ||
1148 | static constexpr size_t _S_alignment = __alignof__(_Fp); | |
1149 | ||
1150 | public: | |
1151 | using value_type = _Fp; | |
1152 | using difference_type = value_type; | |
1153 | ||
1154 | static constexpr bool is_always_lock_free | |
1155 | = __atomic_always_lock_free(sizeof(_Fp), 0); | |
1156 | ||
1157 | __atomic_float() = default; | |
1158 | ||
1159 | constexpr | |
1160 | __atomic_float(_Fp __t) : _M_fp(__t) | |
1161 | { } | |
1162 | ||
1163 | __atomic_float(const __atomic_float&) = delete; | |
1164 | __atomic_float& operator=(const __atomic_float&) = delete; | |
1165 | __atomic_float& operator=(const __atomic_float&) volatile = delete; | |
1166 | ||
1167 | _Fp | |
1168 | operator=(_Fp __t) volatile noexcept | |
1169 | { | |
1170 | this->store(__t); | |
1171 | return __t; | |
1172 | } | |
1173 | ||
1174 | _Fp | |
1175 | operator=(_Fp __t) noexcept | |
1176 | { | |
1177 | this->store(__t); | |
1178 | return __t; | |
1179 | } | |
1180 | ||
1181 | bool | |
1182 | is_lock_free() const volatile noexcept | |
1183 | { return __atomic_impl::is_lock_free<sizeof(_Fp), _S_alignment>(); } | |
1184 | ||
1185 | bool | |
1186 | is_lock_free() const noexcept | |
1187 | { return __atomic_impl::is_lock_free<sizeof(_Fp), _S_alignment>(); } | |
1188 | ||
1189 | void | |
1190 | store(_Fp __t, memory_order __m = memory_order_seq_cst) volatile noexcept | |
1191 | { __atomic_impl::store(&_M_fp, __t, __m); } | |
1192 | ||
1193 | void | |
1194 | store(_Fp __t, memory_order __m = memory_order_seq_cst) noexcept | |
1195 | { __atomic_impl::store(&_M_fp, __t, __m); } | |
1196 | ||
1197 | _Fp | |
1198 | load(memory_order __m = memory_order_seq_cst) const volatile noexcept | |
1199 | { return __atomic_impl::load(&_M_fp, __m); } | |
1200 | ||
1201 | _Fp | |
1202 | load(memory_order __m = memory_order_seq_cst) const noexcept | |
1203 | { return __atomic_impl::load(&_M_fp, __m); } | |
1204 | ||
1205 | operator _Fp() const volatile noexcept { return this->load(); } | |
1206 | operator _Fp() const noexcept { return this->load(); } | |
1207 | ||
1208 | _Fp | |
1209 | exchange(_Fp __desired, | |
1210 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
1211 | { return __atomic_impl::exchange(&_M_fp, __desired, __m); } | |
1212 | ||
1213 | _Fp | |
1214 | exchange(_Fp __desired, | |
1215 | memory_order __m = memory_order_seq_cst) noexcept | |
1216 | { return __atomic_impl::exchange(&_M_fp, __desired, __m); } | |
1217 | ||
1218 | bool | |
1219 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1220 | memory_order __success, | |
1221 | memory_order __failure) noexcept | |
1222 | { | |
1223 | return __atomic_impl::compare_exchange_weak(&_M_fp, | |
1224 | __expected, __desired, | |
1225 | __success, __failure); | |
1226 | } | |
1227 | ||
1228 | bool | |
1229 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1230 | memory_order __success, | |
1231 | memory_order __failure) volatile noexcept | |
1232 | { | |
1233 | return __atomic_impl::compare_exchange_weak(&_M_fp, | |
1234 | __expected, __desired, | |
1235 | __success, __failure); | |
1236 | } | |
1237 | ||
1238 | bool | |
1239 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1240 | memory_order __success, | |
1241 | memory_order __failure) noexcept | |
1242 | { | |
1243 | return __atomic_impl::compare_exchange_strong(&_M_fp, | |
1244 | __expected, __desired, | |
1245 | __success, __failure); | |
1246 | } | |
1247 | ||
1248 | bool | |
1249 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1250 | memory_order __success, | |
1251 | memory_order __failure) volatile noexcept | |
1252 | { | |
1253 | return __atomic_impl::compare_exchange_strong(&_M_fp, | |
1254 | __expected, __desired, | |
1255 | __success, __failure); | |
1256 | } | |
1257 | ||
1258 | bool | |
1259 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1260 | memory_order __order = memory_order_seq_cst) | |
1261 | noexcept | |
1262 | { | |
1263 | return compare_exchange_weak(__expected, __desired, __order, | |
1264 | __cmpexch_failure_order(__order)); | |
1265 | } | |
1266 | ||
1267 | bool | |
1268 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1269 | memory_order __order = memory_order_seq_cst) | |
1270 | volatile noexcept | |
1271 | { | |
1272 | return compare_exchange_weak(__expected, __desired, __order, | |
1273 | __cmpexch_failure_order(__order)); | |
1274 | } | |
1275 | ||
1276 | bool | |
1277 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1278 | memory_order __order = memory_order_seq_cst) | |
1279 | noexcept | |
1280 | { | |
1281 | return compare_exchange_strong(__expected, __desired, __order, | |
1282 | __cmpexch_failure_order(__order)); | |
1283 | } | |
1284 | ||
1285 | bool | |
1286 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1287 | memory_order __order = memory_order_seq_cst) | |
1288 | volatile noexcept | |
1289 | { | |
1290 | return compare_exchange_strong(__expected, __desired, __order, | |
1291 | __cmpexch_failure_order(__order)); | |
1292 | } | |
1293 | ||
6591e422 | 1294 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1295 | _GLIBCXX_ALWAYS_INLINE void |
1296 | wait(_Fp __old, memory_order __m = memory_order_seq_cst) const noexcept | |
1297 | { __atomic_impl::wait(&_M_fp, __old, __m); } | |
1298 | ||
1299 | // TODO add const volatile overload | |
1300 | ||
1301 | _GLIBCXX_ALWAYS_INLINE void | |
1302 | notify_one() const noexcept | |
1303 | { __atomic_impl::notify_one(&_M_fp); } | |
1304 | ||
1305 | // TODO add const volatile overload | |
1306 | ||
1307 | _GLIBCXX_ALWAYS_INLINE void | |
1308 | notify_all() const noexcept | |
1309 | { __atomic_impl::notify_all(&_M_fp); } | |
1310 | ||
1311 | // TODO add const volatile overload | |
6591e422 | 1312 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1313 | |
a90fe12c JW |
1314 | value_type |
1315 | fetch_add(value_type __i, | |
1316 | memory_order __m = memory_order_seq_cst) noexcept | |
1317 | { return __atomic_impl::__fetch_add_flt(&_M_fp, __i, __m); } | |
1318 | ||
1319 | value_type | |
1320 | fetch_add(value_type __i, | |
1321 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
1322 | { return __atomic_impl::__fetch_add_flt(&_M_fp, __i, __m); } | |
1323 | ||
1324 | value_type | |
1325 | fetch_sub(value_type __i, | |
1326 | memory_order __m = memory_order_seq_cst) noexcept | |
1327 | { return __atomic_impl::__fetch_sub_flt(&_M_fp, __i, __m); } | |
1328 | ||
1329 | value_type | |
1330 | fetch_sub(value_type __i, | |
1331 | memory_order __m = memory_order_seq_cst) volatile noexcept | |
1332 | { return __atomic_impl::__fetch_sub_flt(&_M_fp, __i, __m); } | |
1333 | ||
1334 | value_type | |
1335 | operator+=(value_type __i) noexcept | |
1336 | { return __atomic_impl::__add_fetch_flt(&_M_fp, __i); } | |
1337 | ||
1338 | value_type | |
1339 | operator+=(value_type __i) volatile noexcept | |
1340 | { return __atomic_impl::__add_fetch_flt(&_M_fp, __i); } | |
1341 | ||
1342 | value_type | |
1343 | operator-=(value_type __i) noexcept | |
1344 | { return __atomic_impl::__sub_fetch_flt(&_M_fp, __i); } | |
1345 | ||
1346 | value_type | |
1347 | operator-=(value_type __i) volatile noexcept | |
1348 | { return __atomic_impl::__sub_fetch_flt(&_M_fp, __i); } | |
1349 | ||
1350 | private: | |
e4379a93 | 1351 | alignas(_S_alignment) _Fp _M_fp _GLIBCXX20_INIT(0); |
a90fe12c | 1352 | }; |
e4379a93 | 1353 | #undef _GLIBCXX20_INIT |
a90fe12c JW |
1354 | |
1355 | template<typename _Tp, | |
1356 | bool = is_integral_v<_Tp>, bool = is_floating_point_v<_Tp>> | |
1357 | struct __atomic_ref; | |
1358 | ||
1359 | // base class for non-integral, non-floating-point, non-pointer types | |
1360 | template<typename _Tp> | |
1361 | struct __atomic_ref<_Tp, false, false> | |
1362 | { | |
1363 | static_assert(is_trivially_copyable_v<_Tp>); | |
1364 | ||
1365 | // 1/2/4/8/16-byte types must be aligned to at least their size. | |
1366 | static constexpr int _S_min_alignment | |
1367 | = (sizeof(_Tp) & (sizeof(_Tp) - 1)) || sizeof(_Tp) > 16 | |
1368 | ? 0 : sizeof(_Tp); | |
1369 | ||
1370 | public: | |
1371 | using value_type = _Tp; | |
1372 | ||
1373 | static constexpr bool is_always_lock_free | |
1374 | = __atomic_always_lock_free(sizeof(_Tp), 0); | |
1375 | ||
1376 | static constexpr size_t required_alignment | |
1377 | = _S_min_alignment > alignof(_Tp) ? _S_min_alignment : alignof(_Tp); | |
1378 | ||
1379 | __atomic_ref& operator=(const __atomic_ref&) = delete; | |
1380 | ||
1381 | explicit | |
1382 | __atomic_ref(_Tp& __t) : _M_ptr(std::__addressof(__t)) | |
1383 | { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } | |
1384 | ||
1385 | __atomic_ref(const __atomic_ref&) noexcept = default; | |
1386 | ||
1387 | _Tp | |
1388 | operator=(_Tp __t) const noexcept | |
1389 | { | |
1390 | this->store(__t); | |
1391 | return __t; | |
1392 | } | |
1393 | ||
1394 | operator _Tp() const noexcept { return this->load(); } | |
1395 | ||
1396 | bool | |
1397 | is_lock_free() const noexcept | |
1398 | { return __atomic_impl::is_lock_free<sizeof(_Tp), required_alignment>(); } | |
1399 | ||
1400 | void | |
1401 | store(_Tp __t, memory_order __m = memory_order_seq_cst) const noexcept | |
1402 | { __atomic_impl::store(_M_ptr, __t, __m); } | |
1403 | ||
1404 | _Tp | |
1405 | load(memory_order __m = memory_order_seq_cst) const noexcept | |
1406 | { return __atomic_impl::load(_M_ptr, __m); } | |
1407 | ||
1408 | _Tp | |
1409 | exchange(_Tp __desired, memory_order __m = memory_order_seq_cst) | |
1410 | const noexcept | |
1411 | { return __atomic_impl::exchange(_M_ptr, __desired, __m); } | |
1412 | ||
1413 | bool | |
1414 | compare_exchange_weak(_Tp& __expected, _Tp __desired, | |
1415 | memory_order __success, | |
1416 | memory_order __failure) const noexcept | |
1417 | { | |
1418 | return __atomic_impl::compare_exchange_weak(_M_ptr, | |
1419 | __expected, __desired, | |
1420 | __success, __failure); | |
1421 | } | |
1422 | ||
1423 | bool | |
1424 | compare_exchange_strong(_Tp& __expected, _Tp __desired, | |
1425 | memory_order __success, | |
1426 | memory_order __failure) const noexcept | |
1427 | { | |
1428 | return __atomic_impl::compare_exchange_strong(_M_ptr, | |
1429 | __expected, __desired, | |
1430 | __success, __failure); | |
1431 | } | |
1432 | ||
1433 | bool | |
1434 | compare_exchange_weak(_Tp& __expected, _Tp __desired, | |
1435 | memory_order __order = memory_order_seq_cst) | |
1436 | const noexcept | |
1437 | { | |
1438 | return compare_exchange_weak(__expected, __desired, __order, | |
1439 | __cmpexch_failure_order(__order)); | |
1440 | } | |
1441 | ||
1442 | bool | |
1443 | compare_exchange_strong(_Tp& __expected, _Tp __desired, | |
1444 | memory_order __order = memory_order_seq_cst) | |
1445 | const noexcept | |
1446 | { | |
1447 | return compare_exchange_strong(__expected, __desired, __order, | |
1448 | __cmpexch_failure_order(__order)); | |
1449 | } | |
1450 | ||
6591e422 | 1451 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1452 | _GLIBCXX_ALWAYS_INLINE void |
1453 | wait(_Tp __old, memory_order __m = memory_order_seq_cst) const noexcept | |
1454 | { __atomic_impl::wait(_M_ptr, __old, __m); } | |
1455 | ||
1456 | // TODO add const volatile overload | |
1457 | ||
1458 | _GLIBCXX_ALWAYS_INLINE void | |
1459 | notify_one() const noexcept | |
1460 | { __atomic_impl::notify_one(_M_ptr); } | |
1461 | ||
1462 | // TODO add const volatile overload | |
1463 | ||
1464 | _GLIBCXX_ALWAYS_INLINE void | |
1465 | notify_all() const noexcept | |
1466 | { __atomic_impl::notify_all(_M_ptr); } | |
1467 | ||
1468 | // TODO add const volatile overload | |
6591e422 | 1469 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1470 | |
a90fe12c JW |
1471 | private: |
1472 | _Tp* _M_ptr; | |
1473 | }; | |
1474 | ||
1475 | // base class for atomic_ref<integral-type> | |
1476 | template<typename _Tp> | |
1477 | struct __atomic_ref<_Tp, true, false> | |
1478 | { | |
1479 | static_assert(is_integral_v<_Tp>); | |
1480 | ||
1481 | public: | |
1482 | using value_type = _Tp; | |
1483 | using difference_type = value_type; | |
1484 | ||
1485 | static constexpr bool is_always_lock_free | |
1486 | = __atomic_always_lock_free(sizeof(_Tp), 0); | |
1487 | ||
1488 | static constexpr size_t required_alignment | |
1489 | = sizeof(_Tp) > alignof(_Tp) ? sizeof(_Tp) : alignof(_Tp); | |
1490 | ||
1491 | __atomic_ref() = delete; | |
1492 | __atomic_ref& operator=(const __atomic_ref&) = delete; | |
1493 | ||
1494 | explicit | |
1495 | __atomic_ref(_Tp& __t) : _M_ptr(&__t) | |
1496 | { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } | |
1497 | ||
1498 | __atomic_ref(const __atomic_ref&) noexcept = default; | |
1499 | ||
1500 | _Tp | |
1501 | operator=(_Tp __t) const noexcept | |
1502 | { | |
1503 | this->store(__t); | |
1504 | return __t; | |
1505 | } | |
1506 | ||
1507 | operator _Tp() const noexcept { return this->load(); } | |
1508 | ||
1509 | bool | |
1510 | is_lock_free() const noexcept | |
1511 | { | |
1512 | return __atomic_impl::is_lock_free<sizeof(_Tp), required_alignment>(); | |
1513 | } | |
1514 | ||
1515 | void | |
1516 | store(_Tp __t, memory_order __m = memory_order_seq_cst) const noexcept | |
1517 | { __atomic_impl::store(_M_ptr, __t, __m); } | |
1518 | ||
1519 | _Tp | |
1520 | load(memory_order __m = memory_order_seq_cst) const noexcept | |
1521 | { return __atomic_impl::load(_M_ptr, __m); } | |
1522 | ||
1523 | _Tp | |
1524 | exchange(_Tp __desired, | |
1525 | memory_order __m = memory_order_seq_cst) const noexcept | |
1526 | { return __atomic_impl::exchange(_M_ptr, __desired, __m); } | |
1527 | ||
1528 | bool | |
1529 | compare_exchange_weak(_Tp& __expected, _Tp __desired, | |
1530 | memory_order __success, | |
1531 | memory_order __failure) const noexcept | |
1532 | { | |
1533 | return __atomic_impl::compare_exchange_weak(_M_ptr, | |
1534 | __expected, __desired, | |
1535 | __success, __failure); | |
1536 | } | |
1537 | ||
1538 | bool | |
1539 | compare_exchange_strong(_Tp& __expected, _Tp __desired, | |
1540 | memory_order __success, | |
1541 | memory_order __failure) const noexcept | |
1542 | { | |
1543 | return __atomic_impl::compare_exchange_strong(_M_ptr, | |
1544 | __expected, __desired, | |
1545 | __success, __failure); | |
1546 | } | |
1547 | ||
1548 | bool | |
1549 | compare_exchange_weak(_Tp& __expected, _Tp __desired, | |
1550 | memory_order __order = memory_order_seq_cst) | |
1551 | const noexcept | |
1552 | { | |
1553 | return compare_exchange_weak(__expected, __desired, __order, | |
1554 | __cmpexch_failure_order(__order)); | |
1555 | } | |
1556 | ||
1557 | bool | |
1558 | compare_exchange_strong(_Tp& __expected, _Tp __desired, | |
1559 | memory_order __order = memory_order_seq_cst) | |
1560 | const noexcept | |
1561 | { | |
1562 | return compare_exchange_strong(__expected, __desired, __order, | |
1563 | __cmpexch_failure_order(__order)); | |
1564 | } | |
1565 | ||
6591e422 | 1566 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1567 | _GLIBCXX_ALWAYS_INLINE void |
1568 | wait(_Tp __old, memory_order __m = memory_order_seq_cst) const noexcept | |
1569 | { __atomic_impl::wait(_M_ptr, __old, __m); } | |
1570 | ||
1571 | // TODO add const volatile overload | |
1572 | ||
1573 | _GLIBCXX_ALWAYS_INLINE void | |
1574 | notify_one() const noexcept | |
1575 | { __atomic_impl::notify_one(_M_ptr); } | |
1576 | ||
1577 | // TODO add const volatile overload | |
1578 | ||
1579 | _GLIBCXX_ALWAYS_INLINE void | |
1580 | notify_all() const noexcept | |
1581 | { __atomic_impl::notify_all(_M_ptr); } | |
1582 | ||
1583 | // TODO add const volatile overload | |
6591e422 | 1584 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1585 | |
a90fe12c JW |
1586 | value_type |
1587 | fetch_add(value_type __i, | |
1588 | memory_order __m = memory_order_seq_cst) const noexcept | |
1589 | { return __atomic_impl::fetch_add(_M_ptr, __i, __m); } | |
1590 | ||
1591 | value_type | |
1592 | fetch_sub(value_type __i, | |
1593 | memory_order __m = memory_order_seq_cst) const noexcept | |
1594 | { return __atomic_impl::fetch_sub(_M_ptr, __i, __m); } | |
1595 | ||
1596 | value_type | |
1597 | fetch_and(value_type __i, | |
1598 | memory_order __m = memory_order_seq_cst) const noexcept | |
1599 | { return __atomic_impl::fetch_and(_M_ptr, __i, __m); } | |
1600 | ||
1601 | value_type | |
1602 | fetch_or(value_type __i, | |
1603 | memory_order __m = memory_order_seq_cst) const noexcept | |
1604 | { return __atomic_impl::fetch_or(_M_ptr, __i, __m); } | |
1605 | ||
1606 | value_type | |
1607 | fetch_xor(value_type __i, | |
1608 | memory_order __m = memory_order_seq_cst) const noexcept | |
1609 | { return __atomic_impl::fetch_xor(_M_ptr, __i, __m); } | |
1610 | ||
1611 | _GLIBCXX_ALWAYS_INLINE value_type | |
1612 | operator++(int) const noexcept | |
1613 | { return fetch_add(1); } | |
1614 | ||
1615 | _GLIBCXX_ALWAYS_INLINE value_type | |
1616 | operator--(int) const noexcept | |
1617 | { return fetch_sub(1); } | |
1618 | ||
1619 | value_type | |
1620 | operator++() const noexcept | |
1621 | { return __atomic_impl::__add_fetch(_M_ptr, value_type(1)); } | |
1622 | ||
1623 | value_type | |
1624 | operator--() const noexcept | |
1625 | { return __atomic_impl::__sub_fetch(_M_ptr, value_type(1)); } | |
1626 | ||
1627 | value_type | |
1628 | operator+=(value_type __i) const noexcept | |
1629 | { return __atomic_impl::__add_fetch(_M_ptr, __i); } | |
1630 | ||
1631 | value_type | |
1632 | operator-=(value_type __i) const noexcept | |
1633 | { return __atomic_impl::__sub_fetch(_M_ptr, __i); } | |
1634 | ||
1635 | value_type | |
1636 | operator&=(value_type __i) const noexcept | |
1637 | { return __atomic_impl::__and_fetch(_M_ptr, __i); } | |
1638 | ||
1639 | value_type | |
1640 | operator|=(value_type __i) const noexcept | |
1641 | { return __atomic_impl::__or_fetch(_M_ptr, __i); } | |
1642 | ||
1643 | value_type | |
1644 | operator^=(value_type __i) const noexcept | |
1645 | { return __atomic_impl::__xor_fetch(_M_ptr, __i); } | |
1646 | ||
1647 | private: | |
1648 | _Tp* _M_ptr; | |
1649 | }; | |
1650 | ||
1651 | // base class for atomic_ref<floating-point-type> | |
1652 | template<typename _Fp> | |
1653 | struct __atomic_ref<_Fp, false, true> | |
1654 | { | |
1655 | static_assert(is_floating_point_v<_Fp>); | |
1656 | ||
1657 | public: | |
1658 | using value_type = _Fp; | |
1659 | using difference_type = value_type; | |
1660 | ||
1661 | static constexpr bool is_always_lock_free | |
1662 | = __atomic_always_lock_free(sizeof(_Fp), 0); | |
1663 | ||
1664 | static constexpr size_t required_alignment = __alignof__(_Fp); | |
1665 | ||
1666 | __atomic_ref() = delete; | |
1667 | __atomic_ref& operator=(const __atomic_ref&) = delete; | |
1668 | ||
1669 | explicit | |
1670 | __atomic_ref(_Fp& __t) : _M_ptr(&__t) | |
1671 | { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } | |
1672 | ||
1673 | __atomic_ref(const __atomic_ref&) noexcept = default; | |
1674 | ||
1675 | _Fp | |
1676 | operator=(_Fp __t) const noexcept | |
1677 | { | |
1678 | this->store(__t); | |
1679 | return __t; | |
1680 | } | |
1681 | ||
1682 | operator _Fp() const noexcept { return this->load(); } | |
1683 | ||
1684 | bool | |
1685 | is_lock_free() const noexcept | |
1686 | { | |
1687 | return __atomic_impl::is_lock_free<sizeof(_Fp), required_alignment>(); | |
1688 | } | |
1689 | ||
1690 | void | |
1691 | store(_Fp __t, memory_order __m = memory_order_seq_cst) const noexcept | |
1692 | { __atomic_impl::store(_M_ptr, __t, __m); } | |
1693 | ||
1694 | _Fp | |
1695 | load(memory_order __m = memory_order_seq_cst) const noexcept | |
1696 | { return __atomic_impl::load(_M_ptr, __m); } | |
1697 | ||
1698 | _Fp | |
1699 | exchange(_Fp __desired, | |
1700 | memory_order __m = memory_order_seq_cst) const noexcept | |
1701 | { return __atomic_impl::exchange(_M_ptr, __desired, __m); } | |
1702 | ||
1703 | bool | |
1704 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1705 | memory_order __success, | |
1706 | memory_order __failure) const noexcept | |
1707 | { | |
1708 | return __atomic_impl::compare_exchange_weak(_M_ptr, | |
1709 | __expected, __desired, | |
1710 | __success, __failure); | |
1711 | } | |
1712 | ||
1713 | bool | |
1714 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1715 | memory_order __success, | |
1716 | memory_order __failure) const noexcept | |
1717 | { | |
1718 | return __atomic_impl::compare_exchange_strong(_M_ptr, | |
1719 | __expected, __desired, | |
1720 | __success, __failure); | |
1721 | } | |
1722 | ||
1723 | bool | |
1724 | compare_exchange_weak(_Fp& __expected, _Fp __desired, | |
1725 | memory_order __order = memory_order_seq_cst) | |
1726 | const noexcept | |
1727 | { | |
1728 | return compare_exchange_weak(__expected, __desired, __order, | |
1729 | __cmpexch_failure_order(__order)); | |
1730 | } | |
1731 | ||
1732 | bool | |
1733 | compare_exchange_strong(_Fp& __expected, _Fp __desired, | |
1734 | memory_order __order = memory_order_seq_cst) | |
1735 | const noexcept | |
1736 | { | |
1737 | return compare_exchange_strong(__expected, __desired, __order, | |
1738 | __cmpexch_failure_order(__order)); | |
1739 | } | |
1740 | ||
6591e422 | 1741 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1742 | _GLIBCXX_ALWAYS_INLINE void |
1743 | wait(_Fp __old, memory_order __m = memory_order_seq_cst) const noexcept | |
1744 | { __atomic_impl::wait(_M_ptr, __old, __m); } | |
1745 | ||
1746 | // TODO add const volatile overload | |
1747 | ||
1748 | _GLIBCXX_ALWAYS_INLINE void | |
1749 | notify_one() const noexcept | |
1750 | { __atomic_impl::notify_one(_M_ptr); } | |
1751 | ||
1752 | // TODO add const volatile overload | |
1753 | ||
1754 | _GLIBCXX_ALWAYS_INLINE void | |
1755 | notify_all() const noexcept | |
1756 | { __atomic_impl::notify_all(_M_ptr); } | |
1757 | ||
1758 | // TODO add const volatile overload | |
6591e422 | 1759 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1760 | |
a90fe12c JW |
1761 | value_type |
1762 | fetch_add(value_type __i, | |
1763 | memory_order __m = memory_order_seq_cst) const noexcept | |
1764 | { return __atomic_impl::__fetch_add_flt(_M_ptr, __i, __m); } | |
1765 | ||
1766 | value_type | |
1767 | fetch_sub(value_type __i, | |
1768 | memory_order __m = memory_order_seq_cst) const noexcept | |
1769 | { return __atomic_impl::__fetch_sub_flt(_M_ptr, __i, __m); } | |
1770 | ||
1771 | value_type | |
1772 | operator+=(value_type __i) const noexcept | |
1773 | { return __atomic_impl::__add_fetch_flt(_M_ptr, __i); } | |
1774 | ||
1775 | value_type | |
1776 | operator-=(value_type __i) const noexcept | |
1777 | { return __atomic_impl::__sub_fetch_flt(_M_ptr, __i); } | |
1778 | ||
1779 | private: | |
1780 | _Fp* _M_ptr; | |
1781 | }; | |
1782 | ||
1783 | // base class for atomic_ref<pointer-type> | |
1784 | template<typename _Tp> | |
1785 | struct __atomic_ref<_Tp*, false, false> | |
1786 | { | |
1787 | public: | |
1788 | using value_type = _Tp*; | |
1789 | using difference_type = ptrdiff_t; | |
1790 | ||
1791 | static constexpr bool is_always_lock_free = ATOMIC_POINTER_LOCK_FREE == 2; | |
1792 | ||
1793 | static constexpr size_t required_alignment = __alignof__(_Tp*); | |
1794 | ||
1795 | __atomic_ref() = delete; | |
1796 | __atomic_ref& operator=(const __atomic_ref&) = delete; | |
1797 | ||
1798 | explicit | |
1799 | __atomic_ref(_Tp*& __t) : _M_ptr(std::__addressof(__t)) | |
1800 | { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); } | |
1801 | ||
1802 | __atomic_ref(const __atomic_ref&) noexcept = default; | |
1803 | ||
1804 | _Tp* | |
1805 | operator=(_Tp* __t) const noexcept | |
1806 | { | |
1807 | this->store(__t); | |
1808 | return __t; | |
1809 | } | |
1810 | ||
1811 | operator _Tp*() const noexcept { return this->load(); } | |
1812 | ||
1813 | bool | |
1814 | is_lock_free() const noexcept | |
1815 | { | |
1816 | return __atomic_impl::is_lock_free<sizeof(_Tp*), required_alignment>(); | |
1817 | } | |
1818 | ||
1819 | void | |
1820 | store(_Tp* __t, memory_order __m = memory_order_seq_cst) const noexcept | |
1821 | { __atomic_impl::store(_M_ptr, __t, __m); } | |
1822 | ||
1823 | _Tp* | |
1824 | load(memory_order __m = memory_order_seq_cst) const noexcept | |
1825 | { return __atomic_impl::load(_M_ptr, __m); } | |
1826 | ||
1827 | _Tp* | |
1828 | exchange(_Tp* __desired, | |
1829 | memory_order __m = memory_order_seq_cst) const noexcept | |
1830 | { return __atomic_impl::exchange(_M_ptr, __desired, __m); } | |
1831 | ||
1832 | bool | |
1833 | compare_exchange_weak(_Tp*& __expected, _Tp* __desired, | |
1834 | memory_order __success, | |
1835 | memory_order __failure) const noexcept | |
1836 | { | |
1837 | return __atomic_impl::compare_exchange_weak(_M_ptr, | |
1838 | __expected, __desired, | |
1839 | __success, __failure); | |
1840 | } | |
1841 | ||
1842 | bool | |
1843 | compare_exchange_strong(_Tp*& __expected, _Tp* __desired, | |
1844 | memory_order __success, | |
1845 | memory_order __failure) const noexcept | |
1846 | { | |
1847 | return __atomic_impl::compare_exchange_strong(_M_ptr, | |
1848 | __expected, __desired, | |
1849 | __success, __failure); | |
1850 | } | |
1851 | ||
1852 | bool | |
1853 | compare_exchange_weak(_Tp*& __expected, _Tp* __desired, | |
1854 | memory_order __order = memory_order_seq_cst) | |
1855 | const noexcept | |
1856 | { | |
1857 | return compare_exchange_weak(__expected, __desired, __order, | |
1858 | __cmpexch_failure_order(__order)); | |
1859 | } | |
1860 | ||
1861 | bool | |
1862 | compare_exchange_strong(_Tp*& __expected, _Tp* __desired, | |
1863 | memory_order __order = memory_order_seq_cst) | |
1864 | const noexcept | |
1865 | { | |
1866 | return compare_exchange_strong(__expected, __desired, __order, | |
1867 | __cmpexch_failure_order(__order)); | |
1868 | } | |
1869 | ||
6591e422 | 1870 | #if __cpp_lib_atomic_wait |
83a1beee TR |
1871 | _GLIBCXX_ALWAYS_INLINE void |
1872 | wait(_Tp __old, memory_order __m = memory_order_seq_cst) const noexcept | |
1873 | { __atomic_impl::wait(_M_ptr, __old, __m); } | |
1874 | ||
1875 | // TODO add const volatile overload | |
1876 | ||
1877 | _GLIBCXX_ALWAYS_INLINE void | |
1878 | notify_one() const noexcept | |
1879 | { __atomic_impl::notify_one(_M_ptr); } | |
1880 | ||
1881 | // TODO add const volatile overload | |
1882 | ||
1883 | _GLIBCXX_ALWAYS_INLINE void | |
1884 | notify_all() const noexcept | |
1885 | { __atomic_impl::notify_all(_M_ptr); } | |
1886 | ||
1887 | // TODO add const volatile overload | |
6591e422 | 1888 | #endif // __cpp_lib_atomic_wait |
83a1beee | 1889 | |
a90fe12c JW |
1890 | _GLIBCXX_ALWAYS_INLINE value_type |
1891 | fetch_add(difference_type __d, | |
1892 | memory_order __m = memory_order_seq_cst) const noexcept | |
1893 | { return __atomic_impl::fetch_add(_M_ptr, _S_type_size(__d), __m); } | |
1894 | ||
1895 | _GLIBCXX_ALWAYS_INLINE value_type | |
1896 | fetch_sub(difference_type __d, | |
1897 | memory_order __m = memory_order_seq_cst) const noexcept | |
1898 | { return __atomic_impl::fetch_sub(_M_ptr, _S_type_size(__d), __m); } | |
1899 | ||
1900 | value_type | |
1901 | operator++(int) const noexcept | |
1902 | { return fetch_add(1); } | |
1903 | ||
1904 | value_type | |
1905 | operator--(int) const noexcept | |
1906 | { return fetch_sub(1); } | |
1907 | ||
1908 | value_type | |
1909 | operator++() const noexcept | |
1910 | { | |
1911 | return __atomic_impl::__add_fetch(_M_ptr, _S_type_size(1)); | |
1912 | } | |
1913 | ||
1914 | value_type | |
1915 | operator--() const noexcept | |
1916 | { | |
1917 | return __atomic_impl::__sub_fetch(_M_ptr, _S_type_size(1)); | |
1918 | } | |
1919 | ||
1920 | value_type | |
1921 | operator+=(difference_type __d) const noexcept | |
1922 | { | |
1923 | return __atomic_impl::__add_fetch(_M_ptr, _S_type_size(__d)); | |
1924 | } | |
1925 | ||
1926 | value_type | |
1927 | operator-=(difference_type __d) const noexcept | |
1928 | { | |
1929 | return __atomic_impl::__sub_fetch(_M_ptr, _S_type_size(__d)); | |
1930 | } | |
1931 | ||
1932 | private: | |
1933 | static constexpr ptrdiff_t | |
1934 | _S_type_size(ptrdiff_t __d) noexcept | |
1935 | { | |
1936 | static_assert(is_object_v<_Tp>); | |
1937 | return __d * sizeof(_Tp); | |
1938 | } | |
1939 | ||
1940 | _Tp** _M_ptr; | |
1941 | }; | |
1942 | ||
1943 | #endif // C++2a | |
1944 | ||
f0b88346 | 1945 | /// @} group atomics |
afd88205 | 1946 | |
12ffa228 | 1947 | _GLIBCXX_END_NAMESPACE_VERSION |
036e0d4f | 1948 | } // namespace std |
afd88205 | 1949 | |
afd88205 | 1950 | #endif |