C++ 线程不工作并出现错误：启用多线程以使用 std::thread：不允许操作
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Thread doesn't work with an error: Enable multithreading to use std::thread: Operation not permitted
提问by user2925158
I created and executed a simple thread on my system. when I execute this program, I have the error message : Enable multithreading to use std::thread: Operation not permitted
我在我的系统上创建并执行了一个简单的线程。当我执行此程序时，出现错误消息：启用多线程以使用 std::thread：不允许操作
some details about my system :
关于我的系统的一些细节：
- linux ubuntu 13.10
- g++ 4.8.1
- linux Ubuntu 13.10
- 克++ 4.8.1
I compile the source code including the library pthread
我编译了包含库的源代码 pthread
The source code:
源代码：
#include <iostream>
#include <thread>
using namespace std;
void func(void) {
cout << "test thread" << endl;
}
int main() {
cout << "start" << endl;
thread t1 (func);
t1.join();
cout << "end" << endl;
return 0;
}
回答by Igor Popov
It seems that you are trying to use C++11 threads. If it is true, then
您似乎正在尝试使用 C++11 线程。如果是真的，那么
- correct
#include <thread>and#include <iostream>, i.e. do not use"in these lines and add#in front of them. - compile with
g++ -std=c++11 q.cpp -lpthread(dependency order matters for newer g++)
- 正确
#include <thread>和#include <iostream>，即不要"在这些行中使用并#在它们前面添加。 - 编译
g++ -std=c++11 q.cpp -lpthread（依赖顺序对于较新的 g++ 很重要）
Hint: when you are using threads in a static linked library and use this library in an executable, then you have to add the flag -pthreadto the link command for the executable. Example:
提示：当您在静态链接库中使用线程并在可执行文件中使用该库时，您必须将标志添加-pthread到可执行文件的链接命令中。例子：
g++ Obj1.o Obj2.o MyStaticLib.a -o MyExecutable -pthread
