Threads problem

[boss_bhat]

Hi all,
I am new to Threads!! I have a class derived from QWidget and it runs a thread
which prints out messages. I use start, sleep, resume and terminate button to
controle the thread. I dont know how to controle `sleep and resume` of thread.
Here is the piece of code I have written,

ThreadWidget::ThreadWidget(QWidget *parent )
:QWidget(parent)
{

thinThread = new ThinThread();

QPushButton *startButton= new QPushButton("start",this);
QPushButton *sleepButton= new QPushButton("sleep",this);
QPushButton *resumeButton= new QPushButton("resume",this);
QPushButton *terminateButton = new QPushButton("terminate",this);

connect (startButton,SIGNAL (clicked()), thinThread, SLOT(start()));
connect (terminateButton,SIGNAL (clicked()), thinThread, SLOT(terminate()));
//connect (resumeButton,SIGNAL (clicked()), ??;
//connect (sleepButton,SIGNAL (clicked()), ??;

QHBoxLayout *mainLayout = new QHBoxLayout(this);

mainLayout->addWidget(startButton);
mainLayout->addWidget(sleepButton);
mainLayout->addWidget(resumeButton);
mainLayout->addWidget(terminateButton);

setLayout(mainLayout);

}

//ThinThread is derived from QThread!!

void ThinThread ::run ()
{
while(1)
{
sleep(1);
cout <<" in the thread\n";
}

}

Can some body explain how to do it?

Thanks in advance,
Boss

[jpn]

Can some body explain how to do it?

Start of by reading Thread Support in Qt. Then, see Qt's threading examples at /examples/threads.

A few hints:

• if you really want it to enter to an infinite loop inside run(), you'll need wait conditions
• another (and maybe easier) option would be to enter to an event loop instead

[boss_bhat]

I did something like this, it works fine but is this the right way of doing ??

void ThinThread ::run ()
{
 
label:
 
   while(suspFlag)
   {
        sleep(1);
        cout <<" in the thread "<< endl;
   }
   if (!suspFlag)
   {
       while (!suspFlag)
       {
           sleep(1);
       }
   }
 
   goto label;
 
   cout <<"done with the thread\n";
}
 
void ThinThread::suspend()
{
    suspFlag=false;
}
void ThinThread::resume()
{
    suspFlag=true;
 
}

void ThinThread ::run ()
{

label:

   while(suspFlag)
   {
        sleep(1);
        cout <<" in the thread "<< endl;
   }
   if (!suspFlag)
   {
       while (!suspFlag)
       {
           sleep(1);
       }
   }

   goto label;

   cout <<"done with the thread\n";
}

void ThinThread::suspend()
{
    suspFlag=false;
}
void ThinThread::resume()
{
    suspFlag=true;

}

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please suggest me on this
Thanks in advance,
Boss

[jacek]

I did something like this, it works fine but is this the right way of doing ??

Better use QWaitCondition.

And please use the [ code ] tags.