shared_ptr<>实例的线程安全仅适用于管理相互初始化的shared_ptr<>实例,而不是它们指向的实例。 为了强调我的意思,看看这个: shared_ptr<int> global_instance = make_shared<int>(0); void thread_fcn(); int main(int argc, char** argv) { thread thread1(th
void thr(std::shared_ptr<Base> p) { std::this_thread::sleep_for(987ms); //线程睡眠987毫秒 std::shared_ptr<Base> lp = p; // thread-safe, even though the // shared use_count is incremented { static std::mutex io_mutex; std::lock_guard<std::mutex> lk(io_mutex); print("Loca...
#include <iostream> #include <memory> #include <thread> #include <chrono> #include <mutex> #include <vector> std::shared_ptr<int> global_instance = std::make_shared<int>(0); std::mutex m; constexpr int max_loop = 10000; void thread_fcn_thread_safe() { std::lock_guard<std::mute...
template< class T > class shared_ptr;(since C++11) 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: ...
(std::shared_ptr<Base> p) { std::this_thread::sleep_for(std::chrono::seconds(2)); std::shared_ptr<Base> lp = p; // thread-safe, even though the // shared use_count is incremented { static std::mutex io_mutex; std::lock_guard<std::mutex> lk(io_mutex); std::cout << "...
一个最朴素的想法是,使用智能指针管理节点。事实上,如果平台支持std::atomic_is_lock_free(&some_shared_ptr)实现返回true,那么所有内存回收问题就都迎刃而解了(我在X86和Arm平台测试,均返回false)。示例代码(文件命名为lock_free_stack.h)如下: #pragmaonce#include#includetemplate<typenameT>classLockFreeStack{...
Note that the control block of ashared_ptris thread-safe: different non-atomicstd::shared_ptrobjects can be accessed using mutable operations, such asoperator=orreset, simultaneously by multiple threads, even when these instances are copies, and share the same control block internally. ...
引用计数指的是，所有管理同一个裸指针（raw pointer）的shared_ptr，都共享一个引用计数器，每当一个...
C++ Memory management library std::shared_ptr Defined in header <memory> template< class T > class shared_ptr; (since C++11) 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 ...
即使类重载了新/删除运算符？EN之所以这样做，是因为make_shared不仅分配对象，还分配shared_ptr的控制块...