int main(int argc, char** argv) { thread thread1(thread_fcn); thread thread2(thread_fcn); ... thread thread10(thread_fcn); chrono::milliseconds duration(10000); this_thread::sleep_for(duration); return; } void
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("Local pointer in a thread:", lp); } } ...
#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...
std::this_thread::sleep_for(std::chrono::seconds(1)); 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 << "local pointer in a thread:\n" <...
{ 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 << "local pointer in a thread:\n...
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. ...
use_count() << '\n'; } void thr(std::shared_ptr<Base> p) { std::this_thread::sleep_for(987ms); 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);...
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...
{std::this_thread::sleep_for(std::chrono::seconds(1));std::shared_ptr<Base>lp=p;// thread-safe, even though the// shared use_count is incremented{staticstd::mutexio_mutex;std::lock_guard<std::mutex>lk(io_mutex);std::cout<<"local pointer in a thread:\n"<<" lp.get() = "<...