Checking progress efficiently | C++

[Backslash]

Hello everyone,

I'm working with a function that, for instance, does some task it it's own thread and takes the address of an int for progress. Like so:

void doSometing(int* progress)

So, While the function is off running, I need an efficient way to check the progress for completion so that I may process the next item. I was doing something like this:

while(progress < 100)
{
    progressBar->value = progress
}

while(progress < 100)
{
    progressBar->value = progress
}

To copy to clipboard, switch view to plain text mode 

That just seems like a bit much. But if I only check it every, say, 10 seconds, I could conceivably be wasting 9 seconds for every item. So, is there an accepted way to do something like this?

Thanks for your time,
Backslash

[jacek]

You can use QTimer to do something every 10 seconds, but don't expect that you will be able to read that variable's value reliably, if you won't use some kind of synchronization.

[Michiel]

Why don't you use the observer pattern (or signals and slots, which already work well with threads) to automatically notify the progress bar when there's a change?

[Backslash]

Thanks for the help. Also, sorry about forgetting code tags.

I'm taking a look at the observer pattern, thanks for the tip.

-Backslash