問題描述

有人可以發(fā)布一個在 C++ 中啟動兩個(面向對象)線程的簡單示例.

Can someone post a simple example of starting two (Object Oriented) threads in C++.

我正在尋找可以擴展運行方法(或類似的東西)而不是調用 C 樣式線程庫的實際 C++ 線程對象.

I'm looking for actual C++ thread objects that I can extend run methods on (or something similar) as opposed to calling a C-style thread library.

我省略了任何特定于操作系統(tǒng)的請求，希望回復的人會回復要使用的跨平臺庫.我現(xiàn)在只是明確說明這一點.

I left out any OS specific requests in the hopes that whoever replied would reply with cross platform libraries to use. I'm just making that explicit now.

推薦答案

創(chuàng)建一個你想讓線程執(zhí)行的函數(shù)，例如:

Create a function that you want the thread to execute, eg:

void task1(std::string msg)
{
    std::cout << "task1 says: " << msg;
}

現(xiàn)在創(chuàng)建 thread 對象，它最終會像這樣調用上面的函數(shù):

Now create the thread object that will ultimately invoke the function above like so:

std::thread t1(task1, "Hello");

(您需要#include 才能訪問std::thread 類)

(You need to #include <thread> to access the std::thread class)

構造函數(shù)的參數(shù)是線程將執(zhí)行的函數(shù)，后跟函數(shù)的參數(shù).線程在構建時自動啟動.

The constructor's arguments are the function the thread will execute, followed by the function's parameters. The thread is automatically started upon construction.

如果稍后您想等待線程完成執(zhí)行函數(shù)，請調用:

If later on you want to wait for the thread to be done executing the function, call:

t1.join(); 

(加入意味著調用新線程的線程將等待新線程執(zhí)行完畢，然后它才會繼續(xù)自己的執(zhí)行).

(Joining means that the thread who invoked the new thread will wait for the new thread to finish execution, before it will continue its own execution).

#include <string>
#include <iostream>
#include <thread>

using namespace std;

// The function we want to execute on the new thread.
void task1(string msg)
{
    cout << "task1 says: " << msg;
}

int main()
{
    // Constructs the new thread and runs it. Does not block execution.
    thread t1(task1, "Hello");

    // Do other things...

    // Makes the main thread wait for the new thread to finish execution, therefore blocks its own execution.
    t1.join();
}

這里有關于 std::thread 的更多信息

• 在 GCC 上，使用 -std=c++0x -pthread 編譯.
• 這應該適用于任何操作系統(tǒng)，前提是您的編譯器支持此 (C++11) 功能.

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