QThread, bad file descriptor

[saman_artorious]

I created an instance of RS class inside MainWindow. when fd is opened, it gives the value of 19 inside debugger. But, when I access it from inside of the Thread, it always gives value 0.

this is my main file: it initializes a thread that regularly generates packets inside queue as producer, and consumer on the other end, writes them to serial.

serial port is opened in Mainwindow constructor:

rs_plc.rs_plcOpenPort((char *)"/dev/ttyS0"); /*/dev/ttyS3*/

rs_plc.rs_plcOpenPort((char *)"/dev/ttyS0"); /*/dev/ttyS3*/

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ThreadSafeQueue<QByteArray> UpdateJackQueue;
    PlcUpdateThread *plcUpdateProd = new PlcUpdateThread(UpdateJackQueue, 1);
    plcUpdateProd->start();
 
    PlcUpdateThread *plcUpdateCons = new PlcUpdateThread(UpdateJackQueue, 0);
    plcUpdateCons->start();

ThreadSafeQueue<QByteArray> UpdateJackQueue;
    PlcUpdateThread *plcUpdateProd = new PlcUpdateThread(UpdateJackQueue, 1);
    plcUpdateProd->start();

    PlcUpdateThread *plcUpdateCons = new PlcUpdateThread(UpdateJackQueue, 0);
    plcUpdateCons->start();

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here is the Thread:

#ifndef PLCUPDATETHREAD_H
#define PLCUPDATETHREAD_H
 
#include <QByteArray>
#include <QThread>
#include "threadsafequeue.h"
#include "safilanLib.h"
#include "rs485.h"
 
#include <QDebug>
 
class PlcUpdateThread : public QThread
{
    Q_OBJECT
public:
    PlcUpdateThread(ThreadSafeQueue<QByteArray> &q, bool isProducer) : _queue(q), _prod(isProducer) {
        if(_prod)
            qDebug() << "I am a producer";
        else
            qDebug() << "I am a consumer";
    }
 
    void run() {
        if(_prod)
            while(1) produce();
        else
            while(1) consume();
    }
 
 
    void produce() {
 
        const char str[]={UPDATE_xx};
 
        QByteArray built((char*)str, 3) ;
 
        _queue.enqueue(built);
 
//        qDebug() << _queue.count();
 
        msleep(100);
        //sleep(qrand()%5);
    }
 
    void consume() {
        qDebug() << "cosume";
        QByteArray v = _queue.dequeue();
 
        qDebug() << v.toHex();
        rs_plc.writeToSerialPort(v);
 
        qDebug() << _queue.count();
        msleep(300);
        //        sleep(qrand()%5);
    }
 
 
public slots:
 
private:
    ThreadSafeQueue<QByteArray> &_queue;
    bool _prod;
};
 
#endif // PLCUPDATETHREAD_H

#ifndef PLCUPDATETHREAD_H
#define PLCUPDATETHREAD_H

#include <QByteArray>
#include <QThread>
#include "threadsafequeue.h"
#include "safilanLib.h"
#include "rs485.h"

#include <QDebug>

class PlcUpdateThread : public QThread
{
    Q_OBJECT
public:
    PlcUpdateThread(ThreadSafeQueue<QByteArray> &q, bool isProducer) : _queue(q), _prod(isProducer) {
        if(_prod)
            qDebug() << "I am a producer";
        else
            qDebug() << "I am a consumer";
    }

    void run() {
        if(_prod)
            while(1) produce();
        else
            while(1) consume();
    }


    void produce() {

        const char str[]={UPDATE_xx};

        QByteArray built((char*)str, 3) ;

        _queue.enqueue(built);

//        qDebug() << _queue.count();

        msleep(100);
        //sleep(qrand()%5);
    }

    void consume() {
        qDebug() << "cosume";
        QByteArray v = _queue.dequeue();

        qDebug() << v.toHex();
        rs_plc.writeToSerialPort(v);

        qDebug() << _queue.count();
        msleep(300);
        //        sleep(qrand()%5);
    }


public slots:

private:
    ThreadSafeQueue<QByteArray> &_queue;
    bool _prod;
};

#endif // PLCUPDATETHREAD_H

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here is the write to serial function that the above thread calls:

and here is the RS instance created statically write after the RS class:

void rs_flushPort ();
    bool rs_plcConfigPort();
    bool rs_azmthConfigPort();
 
};
 
static RS              rs_plc;

void rs_flushPort ();
    bool rs_plcConfigPort();
    bool rs_azmthConfigPort();

};

static RS              rs_plc;

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