T atomic_fetch_add_explicit(volatilestd::atomic<T>*obj, typenamestd::atomic<T>::difference_typearg, std::memory_orderorder)noexcept; (4)(since C++11) Performs atomic addition. Atomically addsargto the value pointed to byobjand returns the valueobjheld previously. The operation is performed ...
T fetch_add( T arg, std::memory_order order = std::memory_order_seq_cst ) noexcept; T fetch_add( T arg, std::memory_order order = std::memory_order_seq_cst ) volatile noexcept; 仅为atomic<T*> 模板特化的成员 (2) T* fetch_add( std::ptrdiff_t arg, std::memory_order or...
#include <iostream> #include <thread> #include <atomic> std::atomic<long long> data; void do_work() { data.fetch_add(1, std::memory_order_relaxed); } int main() { std::thread th1(do_work); std::thread th2(do_work); std::thread th3(do_work); std::thread th4(do_work); ...
#include<iostream>#include<thread>#include<atomic>std::atomic<long long>data;voiddo_work(){data.fetch_add(1,std::memory_order_relaxed);}intmain(){std::threadth1(do_work);std::threadth2(do_work);std::threadth3(do_work);std::threadth4(do_work);std::threadth5(do_work);th1.join(...
#include <iostream> #include <thread> #include <atomic> std::atomic<long long> data; void do_work() { data.fetch_add(1, std::memory_order_relaxed); } int main() { std::thread th1(do_work); std::thread th2(do_work); std::thread th3(do_work); std::thread th4(do_work); ...
T fetch_add(T arg,std::memory_orderorder= std::memory_order_seq_cst)volatilenoexcept; (2)(since C++11) member only ofatomic<T*>partial specialization T*fetch_add(std::ptrdiff_targ, std::memory_orderorder= std::memory_order_seq_cst)noexcept; ...
std::atomic_int x{1}; x.fetch_add(1);// 原子操作x +=1;// 原子操作x = x +1;// 非原子操作 图解: Syntax error in textmermaid version 10.9.0 2.std::atomic并非总是无锁的 无锁(lock-free)是std::atomic的重要特性之一,但并非所有std::atomic对象都能实现无锁操作。是否无锁依赖于以下因...
T fetch_add(T arg, std::memory_orderorder=std::memory_order_seq_cst)constnoexcept; (1) member only ofatomic_ref<T*>template specialization T*fetch_add(std::ptrdiff_targ, std::memory_orderorder=std::memory_order_seq_cst)constnoexcept; ...
T fetch_add(ptrdiff_t v, memory_order m= memory_order_seq_cst) noexcept; 该函数将原子对象封装的值加上v,同时返回原子对象的旧值。其功能用伪代码表示为: auto old =contained contained+=vreturnold 其中contained为原子对象封装值,本文后面均使用contained代表该值。注: 以上是为了便于理解的伪代码,实际...
atomic::fetch_addatomic::fetch_subatomic::operator++atomic::operator--operator(comp.assign.) atomic::store : 修改包含的值 atomic::load : 读取包含的值 // atomic::load/store example#include<iostream> // std::cout#include<atomic> // std::atomic, std::memory_order_relaxed#include<thread> /...