提高:: this_thread :: interruption_point（）不会抛出抛出boost :: thread_interrupted＆安培;例外 [英] boost::this_thread::interruption_point() doesn't throw boost::thread_interrupted& exception

问题描述

我想使用boost ::线程中断中断线程（）。我有以下的code不抛出抛出boost :: thread_interrupted＆安培;例外：

I want to interrupt a thread using boost::thread interrupt(). I have the following code which doesn't throw boost::thread_interrupted& exception:

int myClass::myFunction (arg1, arg2) try{
//some code here
    do {   
        boost::this_thread::interruption_point(); 
        //some other code here
    } while (counter != 20000); 
}catch (boost::thread_interrupted&) {
    cout << "interrupted" << endl;
}

如果我更换的boost :: this_thread :: interruption_point（）用的boost :: this_thread ::睡眠（升压::了posix_time ::毫秒（150））的例外是罚球和中断的作品，因为它应该。

If I replace boost::this_thread::interruption_point() with boost::this_thread::sleep( boost::posix_time::milliseconds(150)) exception is throw and interrupt works as it should.

有人能解释为什么提振:: this_thread :: interruption_point（）不会抛出预期的异常？

Can someone explain why boost::this_thread::interruption_point() doesn't throw the expected exception?

推荐答案

作为评论者指出，有没有办法排除一个简单的竞争条件（取决于你的架构和负载了很多CPU上）。增加一个明确的睡眠帮助其实凸显了这一。

As the commenter noted, there's no way to rule out a simple race condition (depends a lot on your architecture and load on the CPU). The fact adding an explicit sleep "helps" underlines this.

您是单核系统上运行？的

Are you running on a single-core system?

下面的的情况下，一个简单自足比如你点东西，你正在做的一样。看到这个简单的测试：

Here's a simple selfcontained example in case you spot something you are doing differently. See this simple tester:

#include <iostream> 
#include <boost/thread.hpp>

struct myClass { 
    int myFunction(int arg1, int arg2);
};

int myClass::myFunction (int arg1, int arg2)
{
    int counter = 0;
    try
    {
        //some code here
        do {   
            boost::this_thread::interruption_point(); 
            //some other code here
            ++counter;
        } while (counter != 20000); 
    } catch (boost::thread_interrupted&) {
        std::cout << "interrupted" << std::endl;
    }
    return counter;
}

void treadf() {
    myClass x;
    std::cout << "Returned: " << x.myFunction(1,2) << "\n";
}

int main()
{
    boost::thread t(treadf);
    //t.interrupt(); // UNCOMMENT THIS LINE
    t.join();
}

它打印

Returned: 20000

或者，如果你用注释 t.interrupt行（）

interrupted
Returned: 0

在我的i7处理器的系统。看到它的 住在Coliru

On my i7 system. See it Live On Coliru

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