問題描述
有人可以發布一個在 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的請求，希望回復的人會回復要使用的跨平臺庫.我現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
創建一個你想讓線程執行的函數，例如:
Create a function that you want the thread to execute, eg:
void task1(std::string msg)
{
std::cout << "task1 says: " << msg;
}
現在創建 thread 對象，它最終會像這樣調用上面的函數:
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)
構造函數的參數是線程將執行的函數，后跟函數的參數.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行函數，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行完畢，然后它才會繼續自己的執行).
(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，前提是您的編譯器支持此 (C++11) 功能.
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