violation access problem

OpenGL OpenGL: Basic Coding
1

I get a violation problem when I try to update the value of a CArray. (I use MFC) The update of values is made in other thread (where RecalculateActualTrajectory is called) than the of where I have the opengl painting codes (where drawActualPath is called). I see that the number of elements of ‘m_av6PointandOrientationActual’ is bigger than the one generated. Something happens that increase that. Is there some way to be able to update this carray variable?

from CTrajectoryGuide: CArray <CVector6, CVector6> m_av6PointandOrientationActual;

void CTrajectoryGuide::drawActualPath()
{
glPushAttrib(GL_ENABLE_BIT | GL_LIGHTING_BIT);
glDisable(GL_LIGHTING);
glLineWidth(2.0);

glEnable(GL_LINE_STIPPLE);
glLineStipple(1, 0xFF00);

// LINES
glBegin(GL_LINES);
	glColor3ub(0, 0, 255);
	for (int i=1; i&lt; m_av6PointandOrientationActual.GetCount(); i++)
	{
		glVertex3d(m_av6PointandOrientationActual.GetAt(i-1)(0),m_av6PointandOrientationActual.GetAt(i-1)(1),m_av6PointandOrientationActual.GetAt(i-1)(2));
		glVertex3d(m_av6PointandOrientationActual.GetAt(i)(0),m_av6PointandOrientationActual.GetAt(i)(1),m_av6PointandOrientationActual.GetAt(i)(2));
	}
glEnd();

…
}

void CTrajectoryGuide::RecalculateActualTrajectory(CVector6 v6ActualPosition,CArray <CVector6, CVector6> *paSeedPath){
…
// Generate new actual trajectory

  // Reset m_av6PointandOrientationActual
	m_av6PointandOrientationActual.RemoveAll();

  // First point: v6ActualPosition
	m_av6PointandOrientationActual.Add(v6ActualPosition);

  // Second point: projection point
	m_av6PointandOrientationActual.Add(v6ProjectionPoint);
  
  // Further points: from original trajectory
	for (int i=iPoint2_index; i&lt;= paSeedPath-&gt;GetUpperBound(); i++){
		m_av6PointandOrientationActual.Add(paSeedPath-&gt;GetAt(i));
	}

…
}

Thanks