bind 来进⾏类间耦合 using threadfunc_t = std::function<void()>; // 线程状态 enum class TSTATUS { THREAD_NEW, THREAD_RUNNING, THREAD_STOP }; // 线程 class Thread { private: static void *run(void *obj) { Thread *self =
因此同时修改shared_ptr指向的内存区域不是线程安全的。 std::shared_ptr<int> p = std::make_shared<int>(0); void modify_memory() { for (int i = 0; i < 10000; i++) { (*p)++; } } std::thread t1(modify_memory); std::thread t2(modify_memory); t1.join(); t2.join(); std:...
AI代码解释 #include<iostream>#include<memory>#include<thread>#include<atomic>voidworker(std::shared_ptr<int>ptr){std::shared_ptr<int>loaded_ptr=std::atomic_load(&ptr);std::cout<<"Loaded value: "<<*loaded_ptr<<std::endl;}intmain(){std::shared_ptr<int>ptr=std::make_shared<int>(42...
#include <thread> #include <memory> const int N = 10000; std::shared_ptr<int> p = std:: make_shared<int>(0); void Modify() { for (int i = 0; i < N; i++) ++(*p); } int main() { std::thread t1(Modify); std::thread t2(Modify); std::thread t3(Modify); t1.join(...
std::shared_ptr<int> g_instance = std::make_shared<int>(0);constexprintmaxLoop =10000;voidThreadFunc(){for(inti =0; i < maxLoop; i++) { std::shared_ptr<int> tmp = g_instance; (*tmp)++; } cout <<"g_instance use count : "<< g_instance.use_count() << endl; ...
voidThreadFunc(shared_ptrp){shared_ptrlocal_copy; { lock_guard guard{mutex}; local_copy = p; }// 继续操作local_copy... } 这样做就符合了shared_ptr的线程安全性了。 cmu15445 Copy On Write的线程安全字典树(trie) 到这里忽然想到了之前做cmu15445的project0的时候也有不少用上shared_ptr的地方,所...
thread_local std::shared_ptr<Cache> local_cache = create_cache(); 1. 总结 原始指针:性能更高,因为没有引用计数和线程安全管理的开销,但缺乏自动内存管理和线程安全,容易导致内存泄漏或多线程错误。 shared_ptr:提供了自动内存管理和线程安全,但有一定的性能开销,尤其是在引用计数操作和多线程环境下。
{std::shared_ptr<int>loaded_ptr=std::atomic_load(&ptr);std::cout<<"Loaded value: "<<*loaded_ptr<<std::endl;}intmain(){std::shared_ptr<int>ptr=std::make_shared<int>(42);std::threadt1(worker,std::ref(ptr));std::threadt2(worker,std::ref(ptr));t1.join();t2.join();return...
#include<iostream> #include<mutex> #include<thread> using namespace std; template<class T> class Shared_Ptr{ public: Shared_Ptr(T* ptr = nullptr) :_pPtr(ptr) , _pRefCount(new int(1)) , _pMutex(new mutex) {} ~Shared_Ptr() { Release(); } Shared_Ptr(const Shared_Ptr<T>& sp...
emplace_back(thread_func, counter, std::ref(mtx)); } // 等待所有线程完成 for (auto& t : threads) { t.join(); } std::cout << "Final counter value: " << counter->getValue() << std::endl; // 期望输出1000 return 0; } 在这个示例中,我们使用...