\n" << std::flush; const auto start{now()}; std::this_thread::sleep_until(awake_time()); std::chrono::duration<double, std::milli> elapsed{now() - start}; std::cout << "已等待 " << elapsed.count() << " ms\n"; } 可能的输出: 你好,等待者... 已等待 2000.17 ms...
#include <chrono> #include <iostream> #include <syncstream> #include <thread> using namespace std::chrono_literals; void foo() { std::thread::id this_id = std::this_thread::get_id(); std::osyncstream(std::cout) << "线程 " << this_id << " 睡眠...\n"; std::this_thread:...
std::this_thread::yield Defined in header<thread> voidyield()noexcept; (since C++11) Provides a hint to the implementation to reschedule the execution of threads, allowing other threads to run. Parameters (none) Return value (none) Notes ...
#include <chrono> #include <iostream> #include <thread> void foo() { std::this_thread::sleep_for(std::chrono::seconds(1)); } void bar() { std::this_thread::sleep_for(std::chrono::seconds(1)); } int main() { using std::swap; std::thread t1(foo); std::thread t2(bar); ...
thread包装了std::thread,在析构函数中调用join()函数(jthread的j是joining的缩写),修复了std::thread不是RAII类型的缺陷 为什么会有潜在的未定义行为:访问潜在被销毁的 *this? 因为线程可能在await_suspend执行完成前 立刻启动,协程恢复后awaiter就被销毁了。
thread−jthread(C++20) atomic−atomic_flag atomic_ref(C++20)−memory_order Mutual exclusion−Condition variables Futures−Semaphores(C++20) latch(C++20)−barrier(C++20) Safe Reclamation(C++26) Execution support library(C++26) Feature test macros(C++20) ...
Coroutine started on thread: "<< std::this_thread::get_id() <<'\n'; co_await switch_to_new_thread(*out);// awaiter destroyed herestd::cout <<"Coroutine resumed on thread: "<< std::this_thread::get_id() <<'\n'; }intmain() { std::jthread out; resuming_on_new_thread(&...
()std::future<int>f2=std::async(std::launch::async,[](){return8;});// future from a promisestd::promise<int>p;std::future<int>f3=p.get_future();std::thread([](std::promise<int>&p){p.set_value(9);},std::ref(p)).detach();std::cout<<"Waiting...";f1.wait();f2....
#include <iostream>#include <chrono>#include <thread>#include <mutex>#include #include <string>std::map<std::string,std::string>g_pages;std::mutexg_pages_mutex;voidsave_page(conststd::string&url){// simulate a long page fetchstd::this_thread::sleep_for(std::chrono::seconds(2));std...
class Log { public: static void Write(char const *logline); static bool SaveTo(char const *filename); private: static std::list<std::string> m_data; }; In log.cpp we need to add std::list<std::string> Log::m_data; 饿汉模式: 饿汉模式 是指单例实例在程序运行时被立即执行初始化:...