命名空间
变体
操作

std::jthread::get_stop_token

来自 cppreference.com
< cpp‎ | thread‎ | jthread
 
C++
 
并发支持库
线程
(C++11)
(C++20)
(C++17)(C++17)
this_thread 命名空间
(C++11)
(C++11)
(C++11)
(C++11)
协作式取消
互斥
(C++11)
(C++11)
(C++17)
通用锁管理
(C++11)
(C++11)
(C++17)
(C++11)
(C++14)
(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
条件变量
(C++11)
(C++11)
(C++11)
(C++11)
信号量
(C++20)(C++20)
闩锁和屏障
(C++20)
(C++20)
期货
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
安全回收
(C++26)
(C++26)
(C++26)
危险指针
(C++26)
(C++26)
(C++26)
原子类型
(C++11)
(C++20)
(C++11)
原子类型的初始化
(C++11)(C++20 中已弃用)
(C++11)(C++20 中已弃用)
(C++11)
内存排序
(C++11)
(C++11)
(C++11)
(C++11)
原子操作的自由函数
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++26)(C++26)
(C++26)(C++26)
(C++11)
(C++20)(C++20)
(C++20)
(C++20)
原子标志的自由函数
(C++11)(C++11)
(C++11)(C++11)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
 
std::jthread
 
std::stop_token get_stop_token() const noexcept;
 (自 C++20)

返回与 jthread 对象内部持有的相同共享停止状态关联的 std::stop_token。

[编辑] 参数

(无)

[编辑] 返回值

与 jthread 对象内部持有的停止状态关联的 std::stop_token 类型的值。

[编辑] 示例

运行此代码
#include <chrono>
#include <condition_variable>
#include <iostream>
#include <mutex>
#include <string_view>
#include <thread>
 
using namespace std::chrono_literals;
 
void print(std::string_view name, const std::stop_token& token)
{
    std::cout << name << ": stop_possible = " << token.stop_possible();
    std::cout << ", stop_requested = " << token.stop_requested() << '\n';
}
 
void finite_sleepy(std::stop_token stoken)
{
    for (int i = 10; i; --i)
    {
        std::this_thread::sleep_for(300ms);
        if (stoken.stop_requested())
        {
            std::cout << "  Sleepy worker is requested to stop\n";
            return;
        }
 
        std::cout << "  Sleepy worker goes back to sleep\n";
    }
}
 
void infinite_sleepy()
{
    for (int i = 5; i; --i)
    {
        std::this_thread::sleep_for(300ms);
        std::cout << "  Run as long as we want\n";
    }
}
 
 
int main()
{
    std::cout << std::boolalpha;
 
    // A worker thread that will listen to stop requests
    std::jthread stop_worker(finite_sleepy);
 
    // A worker thread that will only stop when completed
    std::jthread inf_worker(infinite_sleepy);
 
    std::stop_token def_token;
    std::stop_token stop_token = stop_worker.get_stop_token();
    std::stop_token inf_token = inf_worker.get_stop_token();
    print("def_token ", def_token);
    print("stop_token", stop_token);
    print("inf_token ", inf_token);
 
    std::cout << "\nRequest and join stop_worker:\n";
    stop_worker.request_stop();
    stop_worker.join();
 
    std::cout << "\nRequest and join inf_worker:\n";
    inf_worker.request_stop();
    inf_worker.join();
    std::cout << '\n';
 
    print("def_token ", def_token);
    print("stop_token", stop_token);
    print("inf_token ", inf_token);
}

可能的输出

def_token : stop_possible = false, stop_requested = false
stop_token: stop_possible = true, stop_requested = false
inf_token : stop_possible = true, stop_requested = false
 
Request and join stop_worker:
  Run as long as we want
  Sleepy worker is requested to stop
 
Request and join inf_worker:
  Run as long as we want
  Run as long as we want
  Run as long as we want
  Run as long as we want
 
def_token : stop_possible = false, stop_requested = false
stop_token: stop_possible = true, stop_requested = true
inf_token : stop_possible = true, stop_requested = true
检索自 "https://cppreference.cn/mwiki/index.php?title=cpp/thread/jthread/get_stop_token&oldid=166747"