如何检查Boost线程正在运行并杀死它

Question

In my program, it start a boost thread and keep the handler as a member of the main thread. When user press the cancel button I need to check the started thread still running and if it is running need tho kill that specific thread. here is the pseudo code.

cheating thread

int i =1;
boost::thread m_uploadThread = boost::thread(uploadFileThread,i);

This is the method use to check if thread is still running, but it is not working

boost::posix_time::time_duration timeout = boost::posix_time::milliseconds(2);
if (this->uploadThread.timed_join(timeout)){
 //Here it should kill the thread
}

Answer 1

The return value true means the thread is completed before the call times out. And looks like what you want is

if(!this->uploadThread.timed_join(timeout))

Answer 2

For stop your thread you can use:

my_thread.interrupt();

in order this to work you have to set an interruption point at the point you want the thread's function stops when you interrupt.

Note: the interruption by it self don't stop the thread it just set a flag and the when an interruption point is reached the thread is interrupted. If no interruption point is found, the thread don't stop.

You can also handle the interrupted exception boost::thread_interrupted that way you can do things depending on if the thread was interrupted or not.

For instance lets assume the next code is inside a thread function:

try
{
    //... some important code here
    boost::this_thread.interruption_poit(); // Setting interrutption point.
}
catch(boost::thread_interrupted&)
{
    // Now you do what ever you want to do when 
    // the thread is interrupted.
}