possible open/write two files same time with QFile

[npotency]

Here's the debug() function that gets called in readADC. I don't know why it would matter since it worked fine when just clicking a button manually.

void arm_rev0::debug(QString buffer)
{
    /*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */
 
    /*Write to log file*/
 
    log << buffer << '\n';
    log.flush();
 
 
 
}

void arm_rev0::debug(QString buffer)
{
    /*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */

    /*Write to log file*/

    log << buffer << '\n';
    log.flush();



}

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[npotency]

I've narrowed the problem down to this section of code.

void arm_rev0::debug(QString buffer)
{
    /*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */
 
    /*Write to log file*/
 
    log << buffer << '\n';
    log.flush();
 
 
 
}

void arm_rev0::debug(QString buffer)
{
    /*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */
 
    /*Write to log file*/
 
    log << buffer << '\n';
    log.flush();
 
 
 
}

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If I have

/*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */

/*Write to window
    msg.append(buffer);
    msg.append("\n");
    ui->t_debug->setText(msg);
    */

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uncommented, it works. otherwise, it doesn't work. Thoughts?