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Atomic_compare_exchange_weak

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Super Angebote für Atomic Q hier im Preisvergleich. Große Auswahl an Atomic Q atomic. ::compare_exchange_weak. (1) bool compare_exchange_weak (T& expected, T val, memory_order sync = memory_order_seq_cst) volatile noexcept; bool compare_exchange_weak (T& expected, T val, memory_order sync = memory_order_seq_cst) noexcept; (2) bool compare_exchange_weak (T& expected, T val, memory_order success, memory_order failure). Unlike atomic_compare_exchange_strong, this weak version is allowed to fail spuriously by returning false even when *expected indeed compares equal to the value contained in obj. This may be acceptable behavior for certain looping algorithms, and may lead to significantly better performance on some platforms std::atomic<T>:: compare_exchange_weak, std::atomic<T>:: compare_exchange_strong. Atomically compares the object representation (until C++20) value representation (since C++20) of *this with that of expected, and if those are bitwise-equal, replaces the former with desired (performs read-modify-write operation) _Bool atomic_compare_exchange_weak(volatile A *object, C *expected, C desired); Parameters A One of the atomic types. C The corresponding non-atomic type of A. object A pointer that points to the atomic object to test and modify. expected A pointer that points to the value expected to be found in the atomic object. desired The value to be stored in the atomic object if the comparison result is.

atomic_compare_exchange_strong_explicit. Atomically compares the object representation (until C++20) value representation (since C++20) of the object pointed to by obj with that of the object pointed to by expected, and if those are bitwise-equal, replaces the former with desired (performs read-modify-write operation) The following excerpt has been taken from the newest draft (N3126, section 29.6): bool atomic_compare_exchange_weak (volatile A* object, C * expected, C desired); bool atomic_compare_exchange_weak (A* object, C * expected, C desired); bool atomic_compare_exchange_strong (volatile A* object, C * expected, C desired); bool. atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not (function template) (C++11) (C++11) (C++11) (C++11) Pages related to std::atomic<T>::compare_exchange_weak,std::atomic<T>::compare_exchange_strong. compare_exchange_weak () is one of compare-exchange primitives provided in C++11. It's weak in the sense that it returns false even if the value of the object is equal to expected. This is due to spurious failure on some platforms where a sequence of instructions (instead of one as on x86) are used to implement it std::atomic | compare_exchange_weak vs. compare_exchange_strong. Ich bin mir nicht sicher, ob es mich nicht zu verstehen, oder die Dokumentation ist nicht eindeutig formuliert. Der folgende Auszug wurde aus dem neuesten Entwurf (N3126, Kapitel 29.6): bool atomic_compare_exchange_weak (volatile A * object, C * expected, C desired); bool atomic_compare_exchange_weak (A * object, C * expected, C.

std :: atomar | compare_exchange_weak vs. compare_exchange_strong. Ich noch unsicher bin, ob es mir nicht zu verstehen, oder die Dokumentation ist nicht eindeutig formuliert bool. atomic_compare_exchange_weak_explicit (. std::atomic<T>* obj, typename std::atomic<T>::value_type* (1) (since. expected, C++11) typename std::atomic<T>::value_type. desired, std::memory_order succ, std::memory_order fail ) noexcept do { new_n->next = old_h; } while (!head.compare_exchange_strong (old_h, new_n)); Recovering from a spurious failure is just updating a single variable and retrying the operation. Removing the nested loop embedded in the strong compare-exchange simplifies the outer loop. On the other hand, if recovering from the failure requires a lot of work. 我们可以注意到一个非常巧妙的设计。在push方法里,atomic_compare_exchange_weak如果失败,证明有其他线程更新了栈顶,而这个时候被其他线程更新的新栈顶值会被更新到new_node->next中,因此循环可以直接再次尝试压栈而无需由程序员更新new_node->next

atomic::compare_exchange_weak - C++ Referenc

Let us know what you found helpful. Tell us about your IBM Documentation experience. Email IBM Documentation support 注意. 行为 atomic_compare_exchange_strong 就好像下面的代码是以原子方式执行的:. if (memcmp (obj, expected, sizeof *obj) == 0) memcpy (obj, &desired, sizeof *obj);else memcpy (expected, obj, sizeof *obj); (标准措辞中称比较是以value的形式被DR 431改为bitwise equality)。 atomic_compare_exchange_weak_explicit #define atomic_compare_exchange_weak_explicit __c11_atomic_compare_exchange_weak Definition at line 130 of file stdatomic.h atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explici

atomic_compare_exchange_weak - C++ Referenc

  1. 如何理解C ++ 11中的std :: atomic :: compare_exchange_weak()?. 内容来源于 Stack Overflow,并遵循 CC BY-SA 3.0 许可协议进行翻译与使用. 回答 ( 2) 关注 ( 0) 查看 ( 1756) bool compare_exchange_weak ( T & expected, T val,.); 但令我感到困惑的是C ++ 11标准(ISO / IEC 14882)中所说的:. 29.6.5.虚假失效的后果是几乎所有使用弱比较交换的应用都将处于循环中。. 另一个问题有关。
  2. atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit From cppreference.com < c‎ | atomic C Language heade
  3. compare_exchange_strong () はより強い命令であり、交換可能な場合はCAS操作が常に成功する。. アーキテクチャによっては、この関数は compare_exchange_strong () と等価だが、PowerPCやARMなどLL/SC命令を提供するアーキテクチャの場合、この関数はハードウェアの弱いLL/SC命令にて実装されうる。. wikipedia:en:Load-link/store-conditional, wikipedia:Load-Link/Store-Conditional などを参照のこと.
  4. atomic_compare_exchange_weak 执行 弱原子比较和交换 操作。 template <class Ty> inline bool atomic_compare_exchange_strong( volatile atomic<Ty>* Atom, Ty* Exp, Ty Value) noexcept; template <class Ty> inline bool atomic_compare_exchange_strong( atomic<Ty>* Atom, Ty* Exp, Ty Value) noexcept
  5. atomic_compare_exchange_weak </br> atomic_compare_exchange_weak_explicit </br> atomic_compare_exchange_strong </br> atomic_compare_exchange_strong_explicit: 原子地比较原子对象和非原子参数的值,如果不相等,则执行原子交换,如果没有,就load atomic: atomic_fetch_add </br> atomic_fetch_add_explici
  6. C++11 CAS无锁函数compare_exchange_weak的使用. 原子性加减通常是用CAS (Compare and Swap)完成的,与平台相关。. CAS的基本形式是:CAS (addr,old,new),当addr中存放的值等于old时,用new对其替换. std::atomic::compare_exchange_weak

Grundlegendes zu std :: atomic :: compare_exchange_weak in C ++ 11. 86 . bool compare_exchange_weak (T& expected, T val,.); compare_exchange_weak()ist eines der in C ++ 11 bereitgestellten Vergleichsaustausch-Grundelemente. Es ist schwach in dem Sinne, dass es false zurückgibt, selbst wenn der Wert des Objekts gleich ist expected. Dies ist auf einen falschen Fehler auf einigen Plattformen. The atomic_compare_exchange_weak() and atomic_compare_exchange_weak_explicit() functions are allowed to fail spuriously, that is, to act as if *obj!= *expected, and set *expected to *obj, even if they're equal. When a compare-and-exchange is in a loop, the weak version yields better performance on some platforms. When a weak compare-and-exchange would require a loop and a strong one wouldn't. thread - Understanding std:: atomic:: compare_exchange_weak() in C++ 11 . std::thread example (3) Warum muss es in fast allen Anwendungen in einer Schleife sein? Denn wenn Sie keine Schleife machen und es fälschlicherweise fehlschlägt, hat Ihr Programm nichts Nützliches getan - Sie haben das atomare Objekt nicht aktualisiert und Sie wissen nicht, was sein aktueller Wert ist (Korrektur. Sure, I can do that. For maximum effectiveness, it'd be good to have it check the specializations for atomic<>, too. Is there something in the libstdc++ testsuite for iterating template instantiations over a list of types, or do I have to roll the list myself

— Built-in Function: bool __atomic_compare_exchange_n (type *ptr, type *expected, type desired, bool weak, int success_memmodel, int failure_memmodel). This built-in function implements an atomic compare and exchange operation. This compares the contents of *ptr with the contents of *expected and if equal, writes desired into *ptr.If they are not equal, the current contents of *ptr is. This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++14 status.. 2172.Does atomic_compare_exchange_* accept v == nullptr arguments?. Section: D.22 [depr.util.smartptr.shared.atomic] Status: C++14 Submitter: Howard Hinnant Opened: 2012-07-28 Last modified: 2017-12-02 Priority: Not Prioritize 在新标准中, cas 分成了两个版本, atomic_compare_exchange_weak 和 atomic_compare_exchange_strong 。weak 版本允许偶发情况下,即使相等也失败(对于上面的例子来说,允许当 *ref == 0 的时候失败)。我们一般使用这个 weak 版本即可(相对 strong 版本成本可能更低) atomic_compare_exchange_weak & atomic_compare_exchange_weak_explicit & atomic_compare_exchange_strong & atomic_compare_exchange_strong_explicit. It atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not. 6: atomic_fetch_add & atomic_fetch_add_explicit . It adds a non-atomic value to an atomic object and obtains.

std::atomic<T>::compare_exchange_weak - cppreference

  1. It was brought up on cppreference atomic_compare_exchange Talk page that the existing implementations of std::atomic_compare_exchange_weak compute the boolean result of the CAS with a non-atomic compare instruction, e.g.. lock cmpxchgq %rcx, (%rsp) cmpq %rdx, %rax which (Edit: apologies for the red herring). break CAS loops such as Concurrency in Action's listing 7.2
  2. ATOMIC_*_LOCK_FREE ATOMIC_FLAG_INIT ATOMIC_VAR_INIT Atomare Operationsbibliothek atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit atomic_exchange, atomic_exchange_explicit atomic_fetch_add, atomic_fetch_add_explicit atomic_fetch_and, atomic_fetch_and.
  3. atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explici
  4. The issue comes from the order of your includes. vlc_atomic.h (which appearently is included by another vlc header) defines a macro atomic_compare_exchange_weak_explicit which is also used in <atomic>, but with a different number of arguments. Reordering your includes in access.cpp, so #include <atomic> is above the vlc headers fixes the problems (imho it's always a good idea to put system.

Each atomic<integral> type has a corresponding macro that can be used in an if directive to determine at compile time whether operations on that type are lock free. If the value of the macro is zero, operations on the type are not lock free. If the value is 1, operations may be lock free, and a runtime check is needed atomic_compare_exchange_weak & atomic_compare_exchange_weak_explicit & atomic_compare_exchange_strong & atomic_compare_exchange_strong_explicit 描述 (Description) 它原子地将原子对象的值与非原子参数进行比较,如果不相等则执行原子交换,否则执行原子交换。 声明 (Declaration) 以下是std :: atomic_compare_exchange_weak的声明。 template< class T.

Weitere Informationen finden Sie hier: < Atomic- > Funktione Return value. The result of the comparison: true if *obj was equal to *expected, false otherwise. Notes. The weak forms ((1) and (3)) of the functions are allowed to fail spuriously, that is, act as if *obj != *expected even if they are equal. When a compare-and-exchange is in a loop, the weak version will yield better performance on some platforms llvm-toolchain-8 1:8.0.1-3~bpo10+1. links: PTS, VCS area: main; in suites: buster-backports; size: 782,952 kB; sloc: cpp: 3,942,961; ansic: 645,291; asm: 370,138. atomic_compare_exchange_weak_explicit. atomic_fetch_key. atomic_fetch_key_explicit. atomic_flag_test_and_set. atomic_flag_test_and_set_explicit. atomic_flag_clear. atomic_flag_clear_explicit. 64-bit Atomics. The optional extension cl_khr_int64_base_atomics implements atomic operations on 64-bit signed and unsigned integers to locations in global and local memory. The cl_khr_int64_extended.

while (!atomic_compare_exchange_weak_acquire (cond->__data.__g_signals + g, 571 &signals, signals - 2)); 572: 573 /* We consumed a signal but we could have consumed from a more recent group: 574: that aliased with ours due to being in the same group slot. If this: 575: might be the case our group must be closed as visible through: 576 __g1. C++ atomic::compare_exchange_weak使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类std::atomic的用法示例。 在下文中一共展示了atomic::compare_exchange_weak方法的30个代码示例,这些例子默认根据受欢迎程度排序。您.

Only Part B In Part A, Lock Version In Part B, Loc

Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchang Warning: That file was not part of the compilation database. It may have many parsing errors. Generated on 2017-Dec-13 from project gcc revision 255606 Powered by Code Browser 2.1 Generator usage only permitted with license. Code Browser 2.1 Generator usage only permitted with license Atomically compares the object representation of the object pointed to by obj with the object representation of the object pointed to by expected, as if by std::memcmp, and if those are bitwise-equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value pointed to by obj into *expected (performs load operation) macro operands). Also note that the header file uses the generic form of __atomic. builtins, which requires the address to be taken of the value. parameter, and then we pass that value on. This allows the macros. to work for any type, and the compiler is smart enough to convert

std:: atomic_compare_exchange_weak, std:: atomic_compare_exchange_strong, std:: atomic_compare_exchange_weak_explicit, std:: atomic_compare_exchange_strong_explicit. From cppreference.com < cpp‎ | atomic C++. Language: Standard library headers: Concepts: Utilities library: Strings library: Containers library: Algorithms library: Iterators library: Numerics library: Input/output library. In a single atomic operation, first compares the value pointed to by obj with the value pointed to by exp for equality. Then, if the values are equal, replaces the value pointed to by obj with the value of desr (performs a read-modify-write operation). Otherwise, if the values are not equal, replaces the value pointed to by exp with the value of obj (performs a load operation), using the. stdatomic.h. /*===---- stdatomic.h - Standard header for atomic types and operations -----=== * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the Software), to deal * in the Software without restriction, including without limitation the rights * to use. News und Foren zu Computer, IT, Wissenschaft, Medien und Politik. Preisvergleich von Hardware und Software sowie Downloads bei Heise Medien Bug #91009: Incorrect usage of std::atomic::compare_exchange_weak: Submitted: 24 May 2018 11:04: Modified: 30 May 2018 12:36: Reporter: Alexey Kopytov: Email Updates

atomic_compare_exchange_weak (C11) - IB

Repairing Sequential Consistency in C/C++11 Ori Lahav MPI-SWS, Germany orilahav@mpi-sws.org Viktor Vafeiadis MPI-SWS, Germany viktor@mpi-sws.org Jeehoon Kan ABA problem. The use of CAS has one problem to deal with. It is called the ABA problem. The problem arises from the C of C AS, where the c omparison is value based. That is, as long as the value involved in the comparison is the same, the swap can proceed. However, there are still occasions that fool the CAS solution we presented 我對std :: atomic :: compare_exchange_weak的虛假故障感到困惑。 如果原子變量的值是預期的值,可以compare_exchange_weak失敗嗎? 如果答案是肯定的:有沒有辦法知道這個值是否是預期值?因爲我的代碼假設如果CAS失敗,那麼該值不是預期的值。 特別是,即使在虛假故障的情況下,compare_exchange_weak是否會將. std::atomic:: compare_exchange_weak, std::atomic:: compare_exchange_strong. Atomically compares the value stored in *this with the value of expected, and if those are equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value stored in *this into expected (performs load operation)

A portable version of stdatomic.h extracted from the FreeBSD libc, for Clang 3.1+ and GCC 4.7+. - stdatomic. Compare And Exchange (CAS) Compare And Exchange (CAE) 명령어는 락을 사용하지 않는 기본 원자함수이며(CPU 레벨에서 지원한다.), 비교와 교환을 원자성을 가지고 수행한다. Compare And Swap (CAS) 라는 이름.

We Make a std::shared_mutex 10 Times Faster - CodeProject

3.3 Deprecate the C++11 Atomic Interface for shared_ptr. The atomic access API in clause 23 is fragile and easy to misuse. It overloads the atomic API for atomic objects in the <atomic> header with identical names and signatures for manipulating non-atomic objects. There is no other precedent for this (existing) API 1 #include<stdio.h> 2 #include<stdatomic.h> 3 #include<stdlib.h> 4 5 //the node type in the stack 6 typedef struct _Node 7 { 8 int data; 9 struct _Node* next; 10 }Node; 11 //the stack 12 typedef struct _lfstack_t 13 { 14 Node *head; 15 }lfstack_t; 16 17 //the push function 18 void lfstack_push(_Atomic lfstack_t *lfstack, int value) 19 { 20 lfstack_t next; 21 lfstack_t orig = atomic_load. 理解C ++ 11中的std :: atomic :: compare_exchange_weak() bool compare_exchange_weak (T& expected, T val,.); compare_exchange_weak()是C ++ 11中提供的比较交换原语之一。即使对象的值等于expected ,它也会返回错误,因此它是弱的 。 这是由于某些平台上伪指令(而不是x86上的指令)被用来实现伪故障 c++ atomic atomic_compare_exchange_weak CAS编程 . 原创. 青黑. 工作日志. 2020/03/26 16:38. 阅读数 786. 概述. 在多线程应用中有个很典型的业务就是共同争抢一个某一个资源,比如很典型的秒杀,很多的线程在争夺某一个资源。本文以一个最简单的例子说明,2万个线程一起争夺一个变量+1的操作。 只使用atomic. 在. php中文网为您准备了C语言中文开发手册,在线手册阅读,让您快速了解C语言中文开发手册,本章节为C语言中文开发手册的atomic_fetch_add部

std::atomic_compare_exchange_weak, std::atomic_compare

Check our new training course. and Creative Commons CC-BY-SA. lecture and lab material Annex D (normative) Compatibility features D.19 Deprecated shared_­ptr atomic access [depr.util.smartptr.shared.atomic Understand std::atomic::compare_exchange_weak() in C++11. This originates from an SO question. Background. compare-and-swap (CAS) is an atomic instruction used in multithreading which serves as one of the building blocks to achieve synchronization. C++11 supports this atomic operation on language level to help us write portable multithreaded code that run on all platforms that are standard.

c++ - std::atomic compare_exchange_weak vs

  1. Understanding std::atomic::compare_exchange_weak() in C++11. Related searches. bool compare_exchange_weak (T& expected, T val,.); compare_exchange_weak() is one of compare-exchange primitives provided in C++11. It's weak in the sense that it returns false even if the value of the object is equal to expected. This is due to spurious failure on some platforms where a sequence of instructions.
  2. std::atomic:: compare_exchange_strong. Atomically compares the object representation of *this with the object representation of expected, as if by std::memcmp, and if those are bitwise-equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value stored in *this into expected (performs load.
  3. C++ atomic std::atomic::compare_exchange_weak Article Creation Date : 08-Apr-2019 08:55:49 AM. #include <iostream> #include <atomic> #include <thread> #include <vector> #include <unistd.h> /* Description: It compares the content of atomic object's contained value with expected and return * true: if the atomic object value == expected value and also change the atomic object's value to the new.
  4. Compliant Solution (atomic_compare_exchange_weak())To recover from spurious failures, a loop must be used. However, atomic_compare_exchange_weak() might fail because the head pointer changed, or the failure may be spurious. In either case, the thread must perform the work repeatedly until the compare-and-exchange succeeds, as shown in this compliant solution
  5. : This corresponds to the C11 atomic_compare_exchange_weak - it may spuriously fail if the current value is expected, as per the pseudocode above; it will not spuriously fail as atomic_compare_exchange_weak may. This call would normally be used when a fail return will cause a retry anyway, saving the need for an extra loop inside the cas.
  6. This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++20 status.. 2980.Cannot compare_exchange empty pointers. Section: D.22 [depr.util.smartptr.shared.atomic] Status: C++20 Submitter: Alisdair Meredith Opened: 2017-06-15 Last modified: 2021-02-25 Priority: Not Prioritized View all other issues in [depr.util.smartptr.

std::atomic<T>::compare_exchange_weak,std::atomic<T

c++ atomic atomic_compare_exchange_weak CAS编程 . 作者:佚名 来源: 网络转载 ; 时间:2020-03-26; 概述. 在多线程应用中有个很典型的业务就是共同争抢一个某一个资源,比如很典型的秒杀,很多的线程在争夺某一个资源。本文以一个最简单的例子说明,2万个线程一起争夺一个变量+1的操作。 只使用atomic. 在. Sign in. fuchsia / third_party / github.com / llvm / llvm-project / eb1c2bdc1f55fbc5d1e7bb86e9f0e038b0f5adb7 / . / libcxx / test / atomics / atomics.types.operations. The feature tag is described along with the language feature below. The feature name or extension name can also be specified with a preceding and following __ (double underscore) to avoid interference from a macro with the same name. For instance, __cxx_rvalue_references__ can be used instead of cxx_rvalue_references The atomic_compare_exchange_weak macro is identical to atomic_compare_exchange_strong (), but is allowed to fail even if atomic variable object is equal to its expected value. The atomic_fetch_add macro adds the value operand to atomic variable object and returns the original contents of the atomic variable. The atomic_fetch_and macro applies the and operator to atomic variable object and.

c++ - Understanding std::atomic::compare_exchange_weak

Atomically compares the value pointed to by obj with the value pointed to by expected, and if those are equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value pointed to by obj into *expected (performs load operation).. The memory models for the read-modify-write and load operations are succ and fail respectively Isn't the return value of __c11_atomic_compare_exchange_weak the success boolean? Even with that fixed, though, this is UB because you're violating the alignment rules for _Atomic. It might appear to emit the right code for now, but it's a ticking time bomb because the compiler could optimize the cmpxchg to a mov (since you're not actually modifying the memory on success). The right way. When opening the UI, the iOS player freeze for a long time and looks like thread deadlock on WriteLock(atomic_compare_exchange_weak_.. P0943R6: Support C atomics in C++ Abstract. We propose to define what it means to include the C <stdatomic.h> header from C++ code. The goal is to enable shared headers that use atomics, and can be included from either C or C++ code

Atomically compares the value stored in *this with the value of expected, and if those are equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value stored in *this into expected (performs load operation).. The memory models for the read-modify-write and load operations are success and failure respectively The ATOMIC_ LOCK FREE macros indicate the lock-free property of the corresponding atomic types, with the signed and unsigned variants grouped together. The properties also apply to the corresponding (partial) specializations of the atomic template. A value of 0 indicates that the types are never lock-free Atomic smart pointers. The proposal N4162 for atomic smart pointers directly addresses the deficiencies of the current implementation. The deficiencies boil down to the three points consistency, correctness, and performance. Here is an overview of the three points. For the details, you have to read the proposal C++ - atomic compare_exchange_weak/strong 함수 . 출처. C++11 표준 라이브러리의 atomic 조작 함수 compare_exchange_weak와 compare_exchange_strong에 대한 메모. 두 함수 모두 변수의 atomic한 CAS(compare-and-swap) 작업을 제공한다. weak 버전과 strong 버전의 동작 사양은 weak 버전에서는 교환 가능한 경우라도 CAS 조작 실패 할. C ++ 11: ¿atomic :: compare_exchange_weak admite tipos no primitivos? Bueno, atomic funciona bien, pero deseo ver si la función de no locking de compare_exchange_weak podría funcionar para estructuras de datos complejas. Comstackdo con -std = c ++ 11 me da

  1. bool atomic_compare_exchange_weak_explicit(volatile A* object, C * expected, C desired, memory_order success, memory_order failure)
  2. std::atomic:: compare_exchange_weak, std::atomic:: compare_exchange_strong. From cppreference.com < cpp‎ | atomic‎ | atomic C++. Language: Standard library headers: Concepts: Utilities library: Strings library: Containers library: Algorithms library: Iterators library: Numerics library: Input/output library: Localizations library: Regular expressions library (C++11) Atomic operations.
  3. Entendiendo std :: atomic :: compare_exchange_weak en C ++ 11. bool compare_exchange_weak (T& expected, T val,.); compare_exchange_weak() es una de las primitivas de intercambio de comparación proporcionadas en C ++ 11. Es débil en el sentido de que devuelve falso incluso si el valor del objeto es igual al expected. Esto se debe a fallas falsas en algunas plataformas donde se usa una.
  4. atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explici
普通のLockと、効率の良いLockのパフォーマンス測定。 - Qiita

atomic - std :: atomar compare_exchange_weak vs

The atomic library provides components for fine-grained atomic operations allowing for lockless concurrent programming. Each atomic operation is indivisible with regards to any other atomic operation that involves the same object Where weak_this is the hidden mutable std::weak_ptr member of std::shared_from_this.The assignment to the weak_this member is not atomic and conflicts with any potentially concurrent access to the same object. This ensures that future calls to shared_from_this() would share ownership with the shared_ptr created by this raw pointer constructor.. The test ptr->weak_this.expired() in the. Understanding std::atomic::compare_exchange_weak() in C++11. 1. bool compare_exchange_weak (T & expected, T val,.); compare_exchange_weak() 是C ++ 11 中提供的比较交换原语之一。即使对象的值等于 expected ,它在返回false的意义上也很弱。这是由于某些平台上的虚假故障导致一系列指令(而不是x86上的指令)用于实现它。在这样的平台. In earlier specifications of atomics the template specialization atomic<integer> was derived from atomic_integer (e.g. atomic<int> was derived from atomic_int), and the working draft required free functions such as. int atomic_load(const atomic_int*) for each of the atomic_integer types. This worked fine with normal function overloading

std::atomic_compare_exchange_weak,std::atomic_compare

You Can Do Any Kind of Atomic Read-Modify-Write Operation. Atomic read-modify-write operations - or RMWs - are more sophisticated than atomic loads and stores. They let you read from a variable in shared memory and simultaneously write a different value in its place. In the C++11 atomic library, all of the following functions perform. C++ and Python Professional Handbooks : A platform for C++ and Python Engineers, where they can contribute their C++ and Python experience along with tips and tricks. Reward Category : Most Viewed Article and Most Liked Articl

How do I choose between the strong and weak versions of

Понимание std :: atomic :: compare_exchange_weak в C ++ 11. bool compare_exchange_weak (T& expected, T val,.); compare_exchange_weak() является одним из примитивов с обменом-обменом, представленным на C ++ 11. Он слаб в том смысле, что он возвращает false, даже если значение. RW Lock이란. RW Lock은 일반적으로 Read는 값을 변경하지 않으니 동기화 문제에서 좀더 자유로울 수 있고, Write 작업만 하나의 mutex를 가지고 접근해야 한다는 아이디어를 가지고 출발합니다. 대신 Read중에 값을 변경하는 일은 없어야 합니다. 그래서 일반적으로 Read. std::shared_ptr is a smart pointer that retains shared ownership of an object through a pointer. Several shared_ptr objects may own the same object. The object is destroyed and its memory deallocated when either of the following happens: the last remaining shared_ptr owning the object is destroyed.; the last remaining shared_ptr owning the object is assigned another pointer via operator= or. C++11標準ライブラリのatomic操作関数compare_exchange_weakとcompare_exchange_strongについてメモ。両関数ともに変数のatomicなCAS(compare-and-swap)操作を提供する。weak版とstrong版との動作仕様は、weak版では 交換可能な場合でも

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