QSerialPort leaking memory?

mojs

My code:

#include "gtest\gtest.h"

struct CrtCheckMemory
{
    _CrtMemState state1;
    _CrtMemState state2;
    _CrtMemState state3;
    CrtCheckMemory()
    {
        _CrtMemCheckpoint(&state1);
    }
    ~CrtCheckMemory()
    {
        _CrtMemCheckpoint(&state2);
        EXPECT_EQ(0, _CrtMemDifference(&state3, &state1, &state2));
        if (_CrtMemDifference(&state3, &state1, &state2))
            _CrtMemDumpStatistics(&state3);
    }
};

TEST(Test, testQtSerialCom)
{
    CrtCheckMemory check;
   
    QSerialPort* port = new QSerialPort();

    delete port;

}

I'm using the Google test Framework but this should not matter at all. I get a value of 1 in _CrtMemDifference so i assume there is somehow a memory leak. Now i am confused.

SGaist

Hi and welcome to devnet,

You should add some background information like OS/Qt Version.

@kuzulis Any idea about that ?

kuzulis

I have no ideas.

Let's @mojs try to do same with the QProcess, QTcpSocket and so on, and see results.

mojs

Thx for the fast reply.

I am using msvc2013/x64 compiler and Qt 5.5. Im not that experienced.

I tried the same test with QTcpSocket and got the same error message. With QProcess it was a bit different:

_CrtMemCheckpoint

QProcess* proc = new QProcess();
delete proc;

_CrtMemDifference // memory leaked
_CrtMemCheckpoint

QSerialPort* port = new QSerialPort();
delete port;

_CrtMemDifference // no memory leaked

I got same results when i first new/delete QSerialPort and QProcess afterwards (Then it leaked in QSerialPort but not in QProcess). I had similar problems while using parts of the boost library (boost::log) where i found out that tls variables causes this behaviour.

As a workaround i can new/delete a QProcess before i run my tests and i get the results i want.