一個thread對象就代表一個線程執行，當對象創建完成后，線程函數就開始執行，下面這段話是c++11的thread類介紹。

An initialized thread object?represents an active thread of execution; Such a thread object?is joinable, and has a unique thread id.

A default-constructed (non-initialized)?thread object is?not joinable, and its thread id is common for all non-joinable threads.

A joinable thread becomes not joinable if moved from, or if either join or detach are called on them.

需要注意的是：當一個線程對象是joinable狀態時，對象在析構前需要使用detach或者jion函數。

現在寫代碼證實這段話，加深c++11 thread類的使用，具體代碼如下：

#include "stdafx.h" #include <memory> #include <string> #include <iostream> #include <thread>void pause_thread(int nSleepTime) {//std::cout << "pause for: " << nSleepTime << "\n";std::this_thread::sleep_for(std::chrono::seconds(nSleepTime)); }int main() {//thread1和thread2 是初始化的線程對象，它是joinable狀態并且有唯一的id;std::thread thread1(pause_thread, 1);std::thread thread2(pause_thread, 2);//thread3是未初始化的線程對象，它是非joinable狀態，id不唯一std::thread thread3;//驗證代碼if (thread1.joinable()){std::cout <<"thread1 is joinable" << std::endl;}if (thread2.joinable()){std::cout << "thread2 is joinable" << std::endl;}if (!thread3.joinable()){std::cout << "thread3 is not joinable" << std::endl;}std::cout << "***********分割線*****************\n\n" << std::endl;std::cout << "thread1: " << thread1.get_id() << std::endl;std::cout << "thread2: " << thread2.get_id() << std::endl;std::cout << "thread3: " << thread3.get_id() << std::endl;//thread objects that are joinable shall either be joined// or detached before they are destroyed.thread1.join();thread2.detach();std::cout << "*************分割線****************\n\n" << std::endl;//A joinable thread becomes not joinable if moved from, //or if either join or detach are called on them.if (!thread1.joinable()){std::cout << "thread1 becomes not joinable" << std::endl;}if (!thread2.joinable()){std::cout << "thread2 becomes not joinable" << std::endl;}return 0; }

運行結果：

總結

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