1 // -*- C++ -*- header. 2 3 // Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. 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 25 /** @file bits/atomic_base.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{atomic} 28 */ 29 30 #ifndef _GLIBCXX_ATOMIC_BASE_H 31 #define _GLIBCXX_ATOMIC_BASE_H 1 32 33 #pragma GCC system_header 34 35 #include <bits/c++config.h> 36 #include <stdbool.h> 37 #include <stdint.h> 38 #include <bits/atomic_lockfree_defines.h> 39 40 namespace std _GLIBCXX_VISIBILITY(default) 41 { 42 _GLIBCXX_BEGIN_NAMESPACE_VERSION 43 44 /** 45 * @defgroup atomics Atomics 46 * 47 * Components for performing atomic operations. 48 * @{ 49 */ 50 51 /// Enumeration for memory_order 52 typedef enum memory_order 53 { 54 memory_order_relaxed, 55 memory_order_consume, 56 memory_order_acquire, 57 memory_order_release, 58 memory_order_acq_rel, 59 memory_order_seq_cst 60 } memory_order; 61 62 // Drop release ordering as per [atomics.types.operations.req]/21 63 constexpr memory_order 64 __cmpexch_failure_order(memory_order __m) noexcept 65 { 66 return __m == memory_order_acq_rel ? memory_order_acquire 67 : __m == memory_order_release ? memory_order_relaxed : __m; 68 } 69 70 inline void 71 atomic_thread_fence(memory_order __m) noexcept 72 { __atomic_thread_fence(__m); } 73 74 inline void 75 atomic_signal_fence(memory_order __m) noexcept 76 { __atomic_thread_fence(__m); } 77 78 /// kill_dependency 79 template<typename _Tp> 80 inline _Tp 81 kill_dependency(_Tp __y) noexcept 82 { 83 _Tp __ret(__y); 84 return __ret; 85 } 86 87 88 // Base types for atomics. 89 template<typename _IntTp> 90 struct __atomic_base; 91 92 /// atomic_char 93 typedef __atomic_base<char> atomic_char; 94 95 /// atomic_schar 96 typedef __atomic_base<signed char> atomic_schar; 97 98 /// atomic_uchar 99 typedef __atomic_base<unsigned char> atomic_uchar; 100 101 /// atomic_short 102 typedef __atomic_base<short> atomic_short; 103 104 /// atomic_ushort 105 typedef __atomic_base<unsigned short> atomic_ushort; 106 107 /// atomic_int 108 typedef __atomic_base<int> atomic_int; 109 110 /// atomic_uint 111 typedef __atomic_base<unsigned int> atomic_uint; 112 113 /// atomic_long 114 typedef __atomic_base<long> atomic_long; 115 116 /// atomic_ulong 117 typedef __atomic_base<unsigned long> atomic_ulong; 118 119 /// atomic_llong 120 typedef __atomic_base<long long> atomic_llong; 121 122 /// atomic_ullong 123 typedef __atomic_base<unsigned long long> atomic_ullong; 124 125 /// atomic_wchar_t 126 typedef __atomic_base<wchar_t> atomic_wchar_t; 127 128 /// atomic_char16_t 129 typedef __atomic_base<char16_t> atomic_char16_t; 130 131 /// atomic_char32_t 132 typedef __atomic_base<char32_t> atomic_char32_t; 133 134 /// atomic_char32_t 135 typedef __atomic_base<char32_t> atomic_char32_t; 136 137 138 /// atomic_int_least8_t 139 typedef __atomic_base<int_least8_t> atomic_int_least8_t; 140 141 /// atomic_uint_least8_t 142 typedef __atomic_base<uint_least8_t> atomic_uint_least8_t; 143 144 /// atomic_int_least16_t 145 typedef __atomic_base<int_least16_t> atomic_int_least16_t; 146 147 /// atomic_uint_least16_t 148 typedef __atomic_base<uint_least16_t> atomic_uint_least16_t; 149 150 /// atomic_int_least32_t 151 typedef __atomic_base<int_least32_t> atomic_int_least32_t; 152 153 /// atomic_uint_least32_t 154 typedef __atomic_base<uint_least32_t> atomic_uint_least32_t; 155 156 /// atomic_int_least64_t 157 typedef __atomic_base<int_least64_t> atomic_int_least64_t; 158 159 /// atomic_uint_least64_t 160 typedef __atomic_base<uint_least64_t> atomic_uint_least64_t; 161 162 163 /// atomic_int_fast8_t 164 typedef __atomic_base<int_fast8_t> atomic_int_fast8_t; 165 166 /// atomic_uint_fast8_t 167 typedef __atomic_base<uint_fast8_t> atomic_uint_fast8_t; 168 169 /// atomic_int_fast16_t 170 typedef __atomic_base<int_fast16_t> atomic_int_fast16_t; 171 172 /// atomic_uint_fast16_t 173 typedef __atomic_base<uint_fast16_t> atomic_uint_fast16_t; 174 175 /// atomic_int_fast32_t 176 typedef __atomic_base<int_fast32_t> atomic_int_fast32_t; 177 178 /// atomic_uint_fast32_t 179 typedef __atomic_base<uint_fast32_t> atomic_uint_fast32_t; 180 181 /// atomic_int_fast64_t 182 typedef __atomic_base<int_fast64_t> atomic_int_fast64_t; 183 184 /// atomic_uint_fast64_t 185 typedef __atomic_base<uint_fast64_t> atomic_uint_fast64_t; 186 187 188 /// atomic_intptr_t 189 typedef __atomic_base<intptr_t> atomic_intptr_t; 190 191 /// atomic_uintptr_t 192 typedef __atomic_base<uintptr_t> atomic_uintptr_t; 193 194 /// atomic_size_t 195 typedef __atomic_base<size_t> atomic_size_t; 196 197 /// atomic_intmax_t 198 typedef __atomic_base<intmax_t> atomic_intmax_t; 199 200 /// atomic_uintmax_t 201 typedef __atomic_base<uintmax_t> atomic_uintmax_t; 202 203 /// atomic_ptrdiff_t 204 typedef __atomic_base<ptrdiff_t> atomic_ptrdiff_t; 205 206 207 #define ATOMIC_VAR_INIT(_VI) { _VI } 208 209 template<typename _Tp> 210 struct atomic; 211 212 template<typename _Tp> 213 struct atomic<_Tp*>; 214 215 216 /** 217 * @brief Base type for atomic_flag. 218 * 219 * Base type is POD with data, allowing atomic_flag to derive from 220 * it and meet the standard layout type requirement. In addition to 221 * compatibilty with a C interface, this allows different 222 * implementations of atomic_flag to use the same atomic operation 223 * functions, via a standard conversion to the __atomic_flag_base 224 * argument. 225 */ 226 _GLIBCXX_BEGIN_EXTERN_C 227 228 struct __atomic_flag_base 229 { 230 /* The target's "set" value for test-and-set may not be exactly 1. */ 231 #if __GCC_ATOMIC_TEST_AND_SET_TRUEVAL == 1 232 bool _M_i; 233 #else 234 unsigned char _M_i; 235 #endif 236 }; 237 238 _GLIBCXX_END_EXTERN_C 239 240 #define ATOMIC_FLAG_INIT { 0 } 241 242 /// atomic_flag 243 struct atomic_flag : public __atomic_flag_base 244 { 245 atomic_flag() noexcept = default; 246 ~atomic_flag() noexcept = default; 247 atomic_flag(const atomic_flag&) = delete; 248 atomic_flag& operator=(const atomic_flag&) = delete; 249 atomic_flag& operator=(const atomic_flag&) volatile = delete; 250 251 // Conversion to ATOMIC_FLAG_INIT. 252 constexpr atomic_flag(bool __i) noexcept 253 : __atomic_flag_base({ __i ? __GCC_ATOMIC_TEST_AND_SET_TRUEVAL : 0 }) 254 { } 255 256 bool 257 test_and_set(memory_order __m = memory_order_seq_cst) noexcept 258 { 259 return __atomic_test_and_set (&_M_i, __m); 260 } 261 262 bool 263 test_and_set(memory_order __m = memory_order_seq_cst) volatile noexcept 264 { 265 return __atomic_test_and_set (&_M_i, __m); 266 } 267 268 void 269 clear(memory_order __m = memory_order_seq_cst) noexcept 270 { 271 __glibcxx_assert(__m != memory_order_consume); 272 __glibcxx_assert(__m != memory_order_acquire); 273 __glibcxx_assert(__m != memory_order_acq_rel); 274 275 __atomic_clear (&_M_i, __m); 276 } 277 278 void 279 clear(memory_order __m = memory_order_seq_cst) volatile noexcept 280 { 281 __glibcxx_assert(__m != memory_order_consume); 282 __glibcxx_assert(__m != memory_order_acquire); 283 __glibcxx_assert(__m != memory_order_acq_rel); 284 285 __atomic_clear (&_M_i, __m); 286 } 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 306 // atomic_char16_t char16_t 307 // atomic_char32_t char32_t 308 // atomic_wchar_t wchar_t 309 // 310 // NB: Assuming _ITp is an integral scalar type that is 1, 2, 4, or 311 // 8 bytes, since that is what GCC built-in functions for atomic 312 // memory access expect. 313 template<typename _ITp> 314 struct __atomic_base 315 { 316 private: 317 typedef _ITp __int_type; 318 319 __int_type _M_i; 320 321 public: 322 __atomic_base() noexcept = default; 323 ~__atomic_base() noexcept = default; 324 __atomic_base(const __atomic_base&) = delete; 325 __atomic_base& operator=(const __atomic_base&) = delete; 326 __atomic_base& operator=(const __atomic_base&) volatile = delete; 327 328 // Requires __int_type convertible to _M_i. 329 constexpr __atomic_base(__int_type __i) noexcept : _M_i (__i) { } 330 331 operator __int_type() const noexcept 332 { return load(); } 333 334 operator __int_type() const volatile noexcept 335 { return load(); } 336 337 __int_type 338 operator=(__int_type __i) noexcept 339 { 340 store(__i); 341 return __i; 342 } 343 344 __int_type 345 operator=(__int_type __i) volatile noexcept 346 { 347 store(__i); 348 return __i; 349 } 350 351 __int_type 352 operator++(int) noexcept 353 { return fetch_add(1); } 354 355 __int_type 356 operator++(int) volatile noexcept 357 { return fetch_add(1); } 358 359 __int_type 360 operator--(int) noexcept 361 { return fetch_sub(1); } 362 363 __int_type 364 operator--(int) volatile noexcept 365 { return fetch_sub(1); } 366 367 __int_type 368 operator++() noexcept 369 { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); } 370 371 __int_type 372 operator++() volatile noexcept 373 { return __atomic_add_fetch(&_M_i, 1, memory_order_seq_cst); } 374 375 __int_type 376 operator--() noexcept 377 { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); } 378 379 __int_type 380 operator--() volatile noexcept 381 { return __atomic_sub_fetch(&_M_i, 1, memory_order_seq_cst); } 382 383 __int_type 384 operator+=(__int_type __i) noexcept 385 { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); } 386 387 __int_type 388 operator+=(__int_type __i) volatile noexcept 389 { return __atomic_add_fetch(&_M_i, __i, memory_order_seq_cst); } 390 391 __int_type 392 operator-=(__int_type __i) noexcept 393 { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); } 394 395 __int_type 396 operator-=(__int_type __i) volatile noexcept 397 { return __atomic_sub_fetch(&_M_i, __i, memory_order_seq_cst); } 398 399 __int_type 400 operator&=(__int_type __i) noexcept 401 { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); } 402 403 __int_type 404 operator&=(__int_type __i) volatile noexcept 405 { return __atomic_and_fetch(&_M_i, __i, memory_order_seq_cst); } 406 407 __int_type 408 operator|=(__int_type __i) noexcept 409 { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); } 410 411 __int_type 412 operator|=(__int_type __i) volatile noexcept 413 { return __atomic_or_fetch(&_M_i, __i, memory_order_seq_cst); } 414 415 __int_type 416 operator^=(__int_type __i) noexcept 417 { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); } 418 419 __int_type 420 operator^=(__int_type __i) volatile noexcept 421 { return __atomic_xor_fetch(&_M_i, __i, memory_order_seq_cst); } 422 423 bool 424 is_lock_free() const noexcept 425 { return __atomic_is_lock_free (sizeof (_M_i), &_M_i); } 426 427 bool 428 is_lock_free() const volatile noexcept 429 { return __atomic_is_lock_free (sizeof (_M_i), &_M_i); } 430 431 void 432 store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept 433 { 434 __glibcxx_assert(__m != memory_order_acquire); 435 __glibcxx_assert(__m != memory_order_acq_rel); 436 __glibcxx_assert(__m != memory_order_consume); 437 438 __atomic_store_n(&_M_i, __i, __m); 439 } 440 441 void 442 store(__int_type __i, 443 memory_order __m = memory_order_seq_cst) volatile noexcept 444 { 445 __glibcxx_assert(__m != memory_order_acquire); 446 __glibcxx_assert(__m != memory_order_acq_rel); 447 __glibcxx_assert(__m != memory_order_consume); 448 449 __atomic_store_n(&_M_i, __i, __m); 450 } 451 452 __int_type 453 load(memory_order __m = memory_order_seq_cst) const noexcept 454 { 455 __glibcxx_assert(__m != memory_order_release); 456 __glibcxx_assert(__m != memory_order_acq_rel); 457 458 return __atomic_load_n(&_M_i, __m); 459 } 460 461 __int_type 462 load(memory_order __m = memory_order_seq_cst) const volatile noexcept 463 { 464 __glibcxx_assert(__m != memory_order_release); 465 __glibcxx_assert(__m != memory_order_acq_rel); 466 467 return __atomic_load_n(&_M_i, __m); 468 } 469 470 __int_type 471 exchange(__int_type __i, 472 memory_order __m = memory_order_seq_cst) noexcept 473 { 474 return __atomic_exchange_n(&_M_i, __i, __m); 475 } 476 477 478 __int_type 479 exchange(__int_type __i, 480 memory_order __m = memory_order_seq_cst) volatile noexcept 481 { 482 return __atomic_exchange_n(&_M_i, __i, __m); 483 } 484 485 bool 486 compare_exchange_weak(__int_type& __i1, __int_type __i2, 487 memory_order __m1, memory_order __m2) noexcept 488 { 489 __glibcxx_assert(__m2 != memory_order_release); 490 __glibcxx_assert(__m2 != memory_order_acq_rel); 491 __glibcxx_assert(__m2 <= __m1); 492 493 return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2); 494 } 495 496 bool 497 compare_exchange_weak(__int_type& __i1, __int_type __i2, 498 memory_order __m1, 499 memory_order __m2) volatile noexcept 500 { 501 __glibcxx_assert(__m2 != memory_order_release); 502 __glibcxx_assert(__m2 != memory_order_acq_rel); 503 __glibcxx_assert(__m2 <= __m1); 504 505 return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2); 506 } 507 508 bool 509 compare_exchange_weak(__int_type& __i1, __int_type __i2, 510 memory_order __m = memory_order_seq_cst) noexcept 511 { 512 return compare_exchange_weak(__i1, __i2, __m, 513 __cmpexch_failure_order(__m)); 514 } 515 516 bool 517 compare_exchange_weak(__int_type& __i1, __int_type __i2, 518 memory_order __m = memory_order_seq_cst) volatile noexcept 519 { 520 return compare_exchange_weak(__i1, __i2, __m, 521 __cmpexch_failure_order(__m)); 522 } 523 524 bool 525 compare_exchange_strong(__int_type& __i1, __int_type __i2, 526 memory_order __m1, memory_order __m2) noexcept 527 { 528 __glibcxx_assert(__m2 != memory_order_release); 529 __glibcxx_assert(__m2 != memory_order_acq_rel); 530 __glibcxx_assert(__m2 <= __m1); 531 532 return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2); 533 } 534 535 bool 536 compare_exchange_strong(__int_type& __i1, __int_type __i2, 537 memory_order __m1, 538 memory_order __m2) volatile noexcept 539 { 540 __glibcxx_assert(__m2 != memory_order_release); 541 __glibcxx_assert(__m2 != memory_order_acq_rel); 542 __glibcxx_assert(__m2 <= __m1); 543 544 return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2); 545 } 546 547 bool 548 compare_exchange_strong(__int_type& __i1, __int_type __i2, 549 memory_order __m = memory_order_seq_cst) noexcept 550 { 551 return compare_exchange_strong(__i1, __i2, __m, 552 __cmpexch_failure_order(__m)); 553 } 554 555 bool 556 compare_exchange_strong(__int_type& __i1, __int_type __i2, 557 memory_order __m = memory_order_seq_cst) volatile noexcept 558 { 559 return compare_exchange_strong(__i1, __i2, __m, 560 __cmpexch_failure_order(__m)); 561 } 562 563 __int_type 564 fetch_add(__int_type __i, 565 memory_order __m = memory_order_seq_cst) noexcept 566 { return __atomic_fetch_add(&_M_i, __i, __m); } 567 568 __int_type 569 fetch_add(__int_type __i, 570 memory_order __m = memory_order_seq_cst) volatile noexcept 571 { return __atomic_fetch_add(&_M_i, __i, __m); } 572 573 __int_type 574 fetch_sub(__int_type __i, 575 memory_order __m = memory_order_seq_cst) noexcept 576 { return __atomic_fetch_sub(&_M_i, __i, __m); } 577 578 __int_type 579 fetch_sub(__int_type __i, 580 memory_order __m = memory_order_seq_cst) volatile noexcept 581 { return __atomic_fetch_sub(&_M_i, __i, __m); } 582 583 __int_type 584 fetch_and(__int_type __i, 585 memory_order __m = memory_order_seq_cst) noexcept 586 { return __atomic_fetch_and(&_M_i, __i, __m); } 587 588 __int_type 589 fetch_and(__int_type __i, 590 memory_order __m = memory_order_seq_cst) volatile noexcept 591 { return __atomic_fetch_and(&_M_i, __i, __m); } 592 593 __int_type 594 fetch_or(__int_type __i, 595 memory_order __m = memory_order_seq_cst) noexcept 596 { return __atomic_fetch_or(&_M_i, __i, __m); } 597 598 __int_type 599 fetch_or(__int_type __i, 600 memory_order __m = memory_order_seq_cst) volatile noexcept 601 { return __atomic_fetch_or(&_M_i, __i, __m); } 602 603 __int_type 604 fetch_xor(__int_type __i, 605 memory_order __m = memory_order_seq_cst) noexcept 606 { return __atomic_fetch_xor(&_M_i, __i, __m); } 607 608 __int_type 609 fetch_xor(__int_type __i, 610 memory_order __m = memory_order_seq_cst) volatile noexcept 611 { return __atomic_fetch_xor(&_M_i, __i, __m); } 612 }; 613 614 615 /// Partial specialization for pointer types. 616 template<typename _PTp> 617 struct __atomic_base<_PTp*> 618 { 619 private: 620 typedef _PTp* __pointer_type; 621 622 __pointer_type _M_p; 623 624 // Factored out to facilitate explicit specialization. 625 constexpr ptrdiff_t 626 _M_type_size(ptrdiff_t __d) { return __d * sizeof(_PTp); } 627 628 constexpr ptrdiff_t 629 _M_type_size(ptrdiff_t __d) volatile { return __d * sizeof(_PTp); } 630 631 public: 632 __atomic_base() noexcept = default; 633 ~__atomic_base() noexcept = default; 634 __atomic_base(const __atomic_base&) = delete; 635 __atomic_base& operator=(const __atomic_base&) = delete; 636 __atomic_base& operator=(const __atomic_base&) volatile = delete; 637 638 // Requires __pointer_type convertible to _M_p. 639 constexpr __atomic_base(__pointer_type __p) noexcept : _M_p (__p) { } 640 641 operator __pointer_type() const noexcept 642 { return load(); } 643 644 operator __pointer_type() const volatile noexcept 645 { return load(); } 646 647 __pointer_type 648 operator=(__pointer_type __p) noexcept 649 { 650 store(__p); 651 return __p; 652 } 653 654 __pointer_type 655 operator=(__pointer_type __p) volatile noexcept 656 { 657 store(__p); 658 return __p; 659 } 660 661 __pointer_type 662 operator++(int) noexcept 663 { return fetch_add(1); } 664 665 __pointer_type 666 operator++(int) volatile noexcept 667 { return fetch_add(1); } 668 669 __pointer_type 670 operator--(int) noexcept 671 { return fetch_sub(1); } 672 673 __pointer_type 674 operator--(int) volatile noexcept 675 { return fetch_sub(1); } 676 677 __pointer_type 678 operator++() noexcept 679 { return __atomic_add_fetch(&_M_p, _M_type_size(1), 680 memory_order_seq_cst); } 681 682 __pointer_type 683 operator++() volatile noexcept 684 { return __atomic_add_fetch(&_M_p, _M_type_size(1), 685 memory_order_seq_cst); } 686 687 __pointer_type 688 operator--() noexcept 689 { return __atomic_sub_fetch(&_M_p, _M_type_size(1), 690 memory_order_seq_cst); } 691 692 __pointer_type 693 operator--() volatile noexcept 694 { return __atomic_sub_fetch(&_M_p, _M_type_size(1), 695 memory_order_seq_cst); } 696 697 __pointer_type 698 operator+=(ptrdiff_t __d) noexcept 699 { return __atomic_add_fetch(&_M_p, _M_type_size(__d), 700 memory_order_seq_cst); } 701 702 __pointer_type 703 operator+=(ptrdiff_t __d) volatile noexcept 704 { return __atomic_add_fetch(&_M_p, _M_type_size(__d), 705 memory_order_seq_cst); } 706 707 __pointer_type 708 operator-=(ptrdiff_t __d) noexcept 709 { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), 710 memory_order_seq_cst); } 711 712 __pointer_type 713 operator-=(ptrdiff_t __d) volatile noexcept 714 { return __atomic_sub_fetch(&_M_p, _M_type_size(__d), 715 memory_order_seq_cst); } 716 717 bool 718 is_lock_free() const noexcept 719 { return __atomic_is_lock_free(_M_type_size(1), &_M_p); } 720 721 bool 722 is_lock_free() const volatile noexcept 723 { return __atomic_is_lock_free(_M_type_size(1), &_M_p); } 724 725 void 726 store(__pointer_type __p, 727 memory_order __m = memory_order_seq_cst) noexcept 728 { 729 __glibcxx_assert(__m != memory_order_acquire); 730 __glibcxx_assert(__m != memory_order_acq_rel); 731 __glibcxx_assert(__m != memory_order_consume); 732 733 __atomic_store_n(&_M_p, __p, __m); 734 } 735 736 void 737 store(__pointer_type __p, 738 memory_order __m = memory_order_seq_cst) volatile noexcept 739 { 740 __glibcxx_assert(__m != memory_order_acquire); 741 __glibcxx_assert(__m != memory_order_acq_rel); 742 __glibcxx_assert(__m != memory_order_consume); 743 744 __atomic_store_n(&_M_p, __p, __m); 745 } 746 747 __pointer_type 748 load(memory_order __m = memory_order_seq_cst) const noexcept 749 { 750 __glibcxx_assert(__m != memory_order_release); 751 __glibcxx_assert(__m != memory_order_acq_rel); 752 753 return __atomic_load_n(&_M_p, __m); 754 } 755 756 __pointer_type 757 load(memory_order __m = memory_order_seq_cst) const volatile noexcept 758 { 759 __glibcxx_assert(__m != memory_order_release); 760 __glibcxx_assert(__m != memory_order_acq_rel); 761 762 return __atomic_load_n(&_M_p, __m); 763 } 764 765 __pointer_type 766 exchange(__pointer_type __p, 767 memory_order __m = memory_order_seq_cst) noexcept 768 { 769 return __atomic_exchange_n(&_M_p, __p, __m); 770 } 771 772 773 __pointer_type 774 exchange(__pointer_type __p, 775 memory_order __m = memory_order_seq_cst) volatile noexcept 776 { 777 return __atomic_exchange_n(&_M_p, __p, __m); 778 } 779 780 bool 781 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, 782 memory_order __m1, 783 memory_order __m2) noexcept 784 { 785 __glibcxx_assert(__m2 != memory_order_release); 786 __glibcxx_assert(__m2 != memory_order_acq_rel); 787 __glibcxx_assert(__m2 <= __m1); 788 789 return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2); 790 } 791 792 bool 793 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2, 794 memory_order __m1, 795 memory_order __m2) volatile noexcept 796 { 797 __glibcxx_assert(__m2 != memory_order_release); 798 __glibcxx_assert(__m2 != memory_order_acq_rel); 799 __glibcxx_assert(__m2 <= __m1); 800 801 return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 0, __m1, __m2); 802 } 803 804 __pointer_type 805 fetch_add(ptrdiff_t __d, 806 memory_order __m = memory_order_seq_cst) noexcept 807 { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); } 808 809 __pointer_type 810 fetch_add(ptrdiff_t __d, 811 memory_order __m = memory_order_seq_cst) volatile noexcept 812 { return __atomic_fetch_add(&_M_p, _M_type_size(__d), __m); } 813 814 __pointer_type 815 fetch_sub(ptrdiff_t __d, 816 memory_order __m = memory_order_seq_cst) noexcept 817 { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); } 818 819 __pointer_type 820 fetch_sub(ptrdiff_t __d, 821 memory_order __m = memory_order_seq_cst) volatile noexcept 822 { return __atomic_fetch_sub(&_M_p, _M_type_size(__d), __m); } 823 }; 824 825 // @} group atomics 826 827 _GLIBCXX_END_NAMESPACE_VERSION 828 } // namespace std 829 830 #endif 831
