[Interest] how to run 21 threads concurrently

[Sujan Dasmahapatra]

I am not able to run my threads concurrently please help.
How can I  run 21 threads concurrently and get the job done by 8 cpus what
I have in my machine.

I am doing like this
[code]

std::vector<QFuture<void> > Threads;
QFuture<void> Th;

for(int z=0; z<21; z++)
{
Th = QtConcurrent::run(this,&UnrstParser,z);
Thraeds.push_back(Th);
}
for(int th=0; th<Threads.size(); th++)
{
 if(Threads[th].isRunning())
Threads[th].waitForFinished();
Threads[th].cancel();
}
Threads.clear();
[/code]

With this first few threads are probably running but not all the threads.
As it's supposed to generate some files by each thread which is not being
generated. Please help.
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