How to stop QFuture thread

Bonnie

QFurture cannot stop untill the fuction is completely executed...

Be aware that not all running asynchronous computations can be canceled. For example, the future returned by QtConcurrent::run() cannot be canceled;

QFuture::cancel() does not stop the thread immediately, it just cancels all the unstarted jobs.

Ketan__Patel__0011

@Bonnie
thanks for the replay

but any how i want to stop it

is it have any other way to stop any process when it is running ?

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please help me to solve the problem
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Bonnie

@Ketan__Patel__0011

You can considering doing the normal way to stop a loop in another thread: adding a member variable to control the loop.

bool b_exitloop = false;

for(int i=1 ; i <= 10 && !b_exitloop;i++)                        
{
    QThread::sleep(1);
    ui->label->setText(QString::number(i));
}

if(this->future_1.isRunning())
{
  this->b_exitloop  = true;
  this->future_1.waitForFinished();
  this->b_exitloop = false;
}

But this cannot stop the sleep.
Also be careful about synchronizing threads if you need to.

Ketan__Patel__0011

@Bonnie

Thanks for reply

i also try this way and i get good result

but this is not a proper and good way for any large application and sensitive application

i need a proper way to solve this problem

i am also doing research for this

Bonnie

@Ketan__Patel__0011 Well, another way is to not using loop in you function and not using run. Try using those map functions in QtConcurrent.
Then you can cancel it.

Ketan__Patel__0011

@Bonnie
thanks for reply

without looping statements is not reliable to manage lot's of process
sorry but i can't remove looping statements

Bonnie

Then I think QtConcurrent is not the right solution for you when you need to exit a loop.
The only way to exit a loop is still controlling by a variable.

Ketan__Patel__0011

@Bonnie

Let's suppose if i use variable for controlling then when i false the any variable or boolean flag that time
is memory still consuming or not ?

Bonnie

What memory do you mean?

Ketan__Patel__0011

@Bonnie

if i stop the any function process using any boolean flag

that time is memory(RAM) are still consuming or not ?

and CPU are still used ?

Bonnie

If you exit the loop, the code in the loop will stop being executed.
I don't understand what memeory / CPU are you talking about.