std ::未来的gcc实验性实现C ++ 0x的异常 [英] std::future exception on gcc experimental implementation of C++0x

问题描述

我正在尝试使用C ++ 0x线程，部分在gcc 4.5中实现，我遇到了一个我不明白的问题。让我们来看看这段代码。

  #include< future> 
 #include< iostream> 
 
 int main（）
 {
 std :: cout<< std :: async（[]（）{return 10;}）。get（）<<的std :: ENDL; 
} 
  

这很简单，应该可以，但事实并非如此。它抛出std :: system_error

lockquote
抛出'std :: system_error'实例后终止调用
what（）：
aborted

what（）返回空字符串，所以根本没有错误信息。更重要的是，它并不适用于使用gcc 4.5的在线编译器，但现在它可以工作。你可以在这里看到
http://liveworkspace.org/code/f3003d62a758e047a880920c84f1241c $ b $但是昨天它抛出了同样的异常（尽管服务器没有做任何改变）。你知道什么是问题吗？

谢谢。

解决方案

尝试与-lpthread链接。出于某种原因，线程库会在没有pthread的情况下编译，但会在运行时崩溃。

I'm experimenting with C++0x threading, partially implemented in gcc 4.5 and I've got a problem, which I can't understand. Let's have a look on this code

#include <future>
#include <iostream>

int main()
{
        std::cout << std::async([]() { return 10; }).get() << std::endl;
}

it's quite simple and should work, but it's not. It throws std::system_error

terminate called after throwing an instance of 'std::system_error' what(): Aborted

what() returns empty string, so there is no error information at all. More then that, it wasn't working on the online compiler, which uses gcc 4.5 as well, but now it works. You can see it here http://liveworkspace.org/code/f3003d62a758e047a880920c84f1241c but yesterday it was throwing the same exception (though, no changes has been made on the server). Do you know what is the issue?

Thanks.

解决方案

Try linking with -lpthread. For some reason the thread library does compile without pthreads but crashes at runtime.

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