c++ - QOpenGLWidget move context to another thread crash -


i have simple example , program crashed when tried call context()->movetothread(render_thread_);. can help? 

class framerenderer: public qthread {     q_object public:     framerenderer(qglcanvas *parent):m_parent(parent), qthread(){}     void run() q_decl_override;     qglcanvas *m_parent; };  class qglcanvas : public qopenglwidget, protected qopenglfunctions {     q_object public:     qglcanvas(qwidget* parent = null);     ~qglcanvas();      virtual void initializegl();     virtual void paintgl();     virtual void resizegl(int width, int height);     void drawthreadentry();     framerenderer* render_thread_; };   void framerenderer::run() {     m_parent->drawthreadentry(); }   qglcanvas::qglcanvas(qwidget* parent)     : qopenglwidget(parent) {     render_thread_ = new framerenderer(this);     donecurrent();     context()->movetothread(render_thread_);     render_thread_->start(); }   void qglcanvas::drawthreadentry() {     while(true)     {         makecurrent();         qopenglfunctions f;         f.initializeopenglfunctions();         f.glclearcolor(1.0, 1.0, 1.0, 1.0);         f.glfinish();         donecurrent();         emit update();     } }

i don't know if it's solution got similar problem on ios, context available after short period of time.

you can try add timmer , delay call opengl

.h

slots:    void update();

.cpp

qtimer *timer = new qtimer(this);  connect(timer, signal(timeout()), this, slot(update())); timer->start(1000);

if it's working maybe should try if can move tothread inside void qopenglwidget::initializegl() responsible set context


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