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.