I have a question, I am trying to find the most simple way (without eventloop and or QFutureWatcher) to run a function in a different thread without blocking the gui. I have an exporter object from other library, can not change it, and its Close() function takes about 15 seconds to close.
So I tried this trick below but it works only for a couple of seconds, but then the processEvents() function blocks until the Export function is finished which makes it useless.
My Code:
QFuture<void> future = QtConcurrent::run([&]() {exporter.Close();
qDebug() << "closed!";});
while (!future.isFinished())
{
QApplication::processEvents();
QThread::msleep(1); //yield
qDebug() << "z";
}
Related
(Working with Qt 5.15.2)
I have a method which receives a signal (sig_responseReady) from the same thread. The purpose of this method is to wait until a response is received. While this method is waiting for the signal, the method is called again because of an event which calls this method (so eventloops get nested). However, the first waitForResponse on the stack does not get the sig_responseReady signal for up to 10 seconds (for no reason I can see), while later called waitForResponse get their signal first.
The result of this design is that I have nested eventloops, which according to this stackoverflow post causes slot/signal handling errors, and should be avoided. I suspect this is the cause of my problem.
Is there a design which accomplishes the same, with only a single eventloop? (I can't come up with it) The function which calls waitForResponse must pause until waitForResponse returns. ..I can't make it asynchronous. I tried replacing eventloop.exec with QCoreApplication::processEvents(QEventLoop::AllEvents,100) in the function below, but still get same strange result. (So maybe nested event loops is not the problem...but I can't figure out the cause)
MyClass::SRequest MyClass::waitForResponse(const QUuid queryID) {
reentryCount++; // Static var to determing nesting/depth count
QEventLoop eventloop;
qDebug() << "MyClass::waitForResponse connect for uid " << queryID << ", depth " << reentryCount;
connect(this,&MyClass::sig_responseReady,&eventloop, &QEventLoop::quit); //, Qt::QueuedConnection); // Allow matching response to stop eventloop
do {
eventloop.exec();
qDebug() << "MyClass::waitForResponse got signal for uid " << queryID;
} while (!queryResponseReady(queryID) && !queryExpired(queryID));
qDebug() << "MyClass::waitForResponse exitted loop for signal for uid " << queryID << ", depth " << reentryCount;
reentryCount--;
return queryTakeResult(queryID);
}
I am new to asio.
Here is guide I was following writing my daytime tcp-server: https://think-async.com/Asio/asio-1.18.1/doc/asio/tutorial/tutdaytime3.html . I was trying to reproduce a reasonable example that would show that asunchronous code is actually asynchronous. I didn't modify anything else, just small piece of code in tcp_server class. I am adding this delay in order to see that after we are waiting timer to expire, we can gracefully handle other client connections/requests. So, did I miss something? Because in my case delay basically doesn't work ;(
void handle_accept(const tcp_connection::pointer &new_connection,
const asio::error_code &error) {
asio::steady_timer timer(io_context_, asio::chrono::seconds(5));
std::cout << "Before timer" << std::endl;
timer.async_wait(std::bind(&tcp_server::handle_wait, this, error, new_connection));
}
void handle_wait(asio::error_code &ec, const tcp_connection::pointer &new_connection) {
if (!ec) {
new_connection->start();
}
std::cout << "Inside timer" << std::endl;
start_accept();
}
void handle_accept(const tcp_connection::pointer &new_connection,
const asio::error_code &error) {
asio::steady_timer timer(io_context_, asio::chrono::seconds(5));
std::cout << "Before timer" << std::endl;
timer.async_wait(std::bind(&tcp_server::handle_wait, this, error, new_connection));
}
The timer is a local variable.
async_wait returns immediately, without blocking.
The function exits, destructing the timer. The timer cancels all pending operations (with error::operation_aborted).
🖛 Make sure the lifetime of the timer extends well enough to allow for it expire (or at least until it stops being relevant). In your case there will probably already be a tcp::acceptor member in your class, and the timer could reside next to it.
I have some code use qtcpsocket to write and read,
write-->sleep-->read;
and ui had 2 and more timer to use this function; by i want i run synchronous;so i add mutex to lock it; by it deadlock;
qt4; qt5;
void MainWindow::Start()
{
pTimer = new QTimer(this);
pTimer->setInterval(100);
connect(pTimer,SIGNAL(timeout()), this, SLOT(OnTimer()) );
pTimer->start();
pTimer2 = new QTimer(this);
pTimer2->setInterval(100);
connect(pTimer2,SIGNAL(timeout()), this, SLOT(OnTimer()) );
pTimer2->start();
}
void MainWindow::OnTimer()
{
FunCal(); // in my real code it will MyObj.DoSometing();
}
void MainWindow::FunCal()
{
qDebug()<<"log in fun...";
QMutexLocker loc(&this->_mtx);
qDebug()<<"getted lock in fun...";
QEventLoop loop;
QTimer::singleShot(100, &loop, SLOT(quit()));
loop.exec();
qDebug()<<"log out fun...";
}
I Want i run and out put as:
log in fun...
getted lock in fun ...
log out fun...
log in fun...
getted lock in fun...
log out fun...
but It Run like this:
log in fun...
getted lock in fun ...
log in fun....
---------------------------------no more ---------------------
IMHO the issue of OP results from a basic misunderstanding:
QTimer doesn't introduce multithreading.
It's just a facility to queue events which will sent after a certain time.
That's why, the QEventLoop is necessary to make it running at all.
However, it's still a deterministic execution and this is what probably happens inside the code of OP:
pTimer->start(); → starts first timer
pTimer2->start(); → starts second timer
control flow returns to event loop of QApplication (not exposed in code)
first timer becomes due and calls MainWindow::FunCal()
qDebug()<<"log in fun..."; → output of log in fun...
QMutexLocker loc(&this->_mtx); → this->_mtx becomes locked
qDebug()<<"getted lock in fun..."; → output of getted lock in fun...
loop.exec(); → enter a nested event loop (Nested event loops are allowed in Qt.)
second timer becomes due and calls MainWindow::FunCal() (Please, remember that it was immediately started after first with same interval time.)
qDebug()<<"log in fun..."; → output of log in fun...
QMutexLocker loc(&this->_mtx); → PROBLEM!
To illustrate it further, imagine the following call stack at this point (above called below):
QApplication::exec()
QEventLoop::exec()
QEventLoop::processEvents()
QTimer::timerEvent()
QTimer::timeOut()
MainWindow::onTimer()
MainWindow::FunCal()
QEventLoop::exec()
QTimer::timerEvent()
QTimer::timeOut()
MainWindow::onTimer()
MainWindow::FunCal()
QMutexLocker::QMutexLocker()
QMutex::lock()
(Note: In reality, you will see much more entries in the call-stack which I considered as irrelevant details in this case.)
The problem is: This second call of MainWindow::FunCal() cannot lock the mutex because it is already locked. Hence, the execution is suspended until the mutex is unlocked but this will never happen. The locking of mutex happened in the same thread (in the first/outer call of MainWindow::FunCal()). Unlocking would require to return from this point but it cannot because it's suspended due to the locked mutex.
If you think this sounds like a cat byting into its own tail – yes, this impression is right. However, the official term is Deadlock.
The usage of a QMutex doesn't make much sense as long as there are no competing threads. In a single thread, a simple bool variable would do as well because there are no concurrent accesses possible in a single thread.
Whatever OP tried to achieve in this code: Concerning the event-based programming forced/required by Qt, the problem is simply modeled wrong.
In single threading, a function cannot be entered twice accept by
a (direct or indirect) recursive call
a call out of a triggered interrupt handler.
Leaving the 2. aside (irrelevant for OPs Qt issue), the recursive call happens explicitly due to establishing a second (nested) event loop. Without this, the whole (mutex) locking is unnecessary and should be removed as well.
To understand event-based programming in general – it's described in the Qt doc. The Event System.
Additionally, I found Another Look at Events by Jasmin Blanchette which IMHO gives a nice little introduction into how the Qt event-based execution works.
Note:
Event-based programming can become confusing as soon as the amount of involved objects and signals becomes large enough. While debugging my Qt applications, I noticed from time to time recursions which I didn't expect.
A simple example: A value is changed and emits a signal. One of the slots updates a Qt widget which emits a signal about modification. One of the slots updates the value. Hence, the value is changed and emits a signal...
To break such infinite recursions, a std::lock_guard might be used with a simple DIY class Lock:
#include <iostream>
#include <mutex>
#include <functional>
#include <cassert>
// a lock class
class Lock {
private:
bool _lock;
public:
Lock(): _lock(false) { }
~Lock() = default;
Lock(const Lock&) = delete;
Lock& operator=(const Lock&) = delete;
operator bool() const { return _lock; }
void lock() { assert(!_lock); _lock = true; }
void unlock() { assert(_lock); _lock = false; }
};
A sample object with
a property-like member: bool _value
a simplified signal emitter: std::function<void()> sigValueSet
and a lock used to prevent recursive calls to setValue(): Lock _lockValue
// a sample data class with a property
class Object {
private:
bool _value; // a value
Lock _lockValue; // a lock to prevent recursion
public:
std::function<void()> sigValueSet;
public:
Object(): _value(false) { }
bool value() const { return _value; }
void setValue(bool value)
{
if (_lockValue) return;
std::lock_guard<Lock> lock(_lockValue);
// assign value
_value = value;
// emit signal
if (sigValueSet) sigValueSet();
}
};
Finally, some code to force the lock into action:
#define DEBUG(...) std::cout << #__VA_ARGS__ << ";\n"; __VA_ARGS__
int main()
{
DEBUG(Object obj);
std::cout << "obj.value(): " << obj.value() << '\n';
DEBUG(obj.sigValueSet = [&](){ obj.setValue(obj.value()); });
DEBUG(obj.setValue(true));
std::cout << "obj.value(): " << obj.value() << '\n';
}
To keep things short, I connected a slot to the signal which directly sets value again while the signal is emitted.
Output:
Object obj;
obj.value(): 0
obj.sigValueSet = [&](){ obj.setValue(obj.value()); };
obj.setValue(true);
obj.value(): 1
Live Demo on coliru
For a counter-example, I excluded the test if (_lockValue) return; and got the following output:
a.out: main.cpp:18: void Lock::lock(): Assertion `!_lock' failed.
Object obj;
obj.value(): 0
obj.sigValueSet = [&](){ obj.setValue(obj.value()); };
obj.setValue(true);
bash: line 7: 12214 Aborted (core dumped) ./a.out
Live Demo on coliru
This is similar to what happened in OPs case with the only difference that in my case double-locking just violated the assert().
To make this complete, I exluded the lock guard std::lock_guard<Lock> lock(_lockValue); as well and got the following output:
execution expired
Live Demo on coliru
The execution was trapped into an infinite recursion, and the online compiler aborted this after a certain time. (Sorry, coliru. I won't do it again.)
In Qt 5.1, I'm having an issue with QXMLStreamReader waiting for a QProcess to produce more data.
If I read lines from an unbuffered QProcess, it works fine:
while(!vupProcess.state() == QProcess::NotRunning)
{
if (vupProcess.atEnd())
{
vupProcess.waitForReadyRead();
}
qDebug() << vupProcess.readLine();
}
It's pretty clear cut: when the buffer is out of data, it waits until there is more. When there is more, it will print lines without waiting.
Now, if I want to do the same with QXMLStreamReader, it works, but the processing of the XML elements happens at the wrong moment (too late).
Consider this:
QXmlStreamReader xml;
xml.setDevice(&vupProcess);
QStack<VUPDevice *> deviceStack;
QXmlStreamReader::TokenType tokenType = QXmlStreamReader::NoToken;
while (tokenType != QXmlStreamReader::EndDocument && !xml.hasError())
{
if (xml.device()->atEnd())
{
xml.device()->waitForReadyRead(XML_READNEXT_TIMEOUT);
}
tokenType = xml.readNext();
if (xml.hasError())
{
qDebug() << "ERROR";
return;
}
...
}
By the time waitForReadyRead(int) is called, a lot of elements are available already, and I need them processed to update the GUI. However, it won't continue until the QProcess starts to output more. It seems to be because the underlying QProcess is read till it's empty as fast as possible, and then my parser unnecessarily hangs in the early stages, because the QProcess doesn't output anymore.
What I need, is xml.hasMoreElements(), so that I can make:
if (xml.device()->atEnd() && !xml.hasMoreElements())
{
xml.device()->waitForReadyRead(XML_READNEXT_TIMEOUT);
}
But I can't seem to find an API call that does this for me.
So, how do I not wait for more data when it's not necessery?
I guess I solved it. There is no method for asking if there ar more XML elements, but the readNext() call will put the QXMLStreamReader object in a state you can detect, and use to have the back-end device wait:
QXmlStreamReader::TokenType tokenType = xml.readNext();
while (xml.error() == QXmlStreamReader::PrematureEndOfDocumentError)
{
xml.device()->waitForReadyRead(XML_READNEXT_TIMEOUT);
tokenType = xml.readNext();
}
if (xml.hasError())
{
...
}
I am trying to get touch inputs for my program targeting an N8 (and a C7), and I am not able to create a QList for keeping touchpoints using QTouchEvent::touchPoints(). The program crashes with the following line: Thread has crashed: A data abort exception has occurred accessing 0xee
The overloaded events function looks like:
bool GLWindow::event(QEvent *event)
{
switch ( event->type() ) {
case QEvent::TouchBegin: {
QList<QTouchEvent::TouchPoint> touchBeginPoints =
static_cast<QTouchEvent *>(event)->touchPoints();
foreach (const QTouchEvent::TouchPoint &touchBeginPoint, touchBeginPoints)
{
float touchBeginX = touchBeginPoint.pos().x();
float touchBeginY = touchBeginPoint.pos().y();
qDebug() << "touchBeginPoint := " << touchBeginX << ", " << touchBeginY;
}
break;
}
case QEvent::TouchUpdate: {
// same as touch begin: getting touch point
break;
}
case QEvent::TouchEnd: {
// same as touch begin: getting touch point
break;
}
default: {
qDebug() << "Goodbye";
return true;
}
}
return true;
}
Now,
I have never worked with containers before. But creating and using a QList in another part of the program works fine. Should I be including something in my .pro file? (Most problems seem to end up regarding this with me!)
I read (a bit) about exceptions in Qt and Symbian, but I am not able to get most of that. BUT I am not doing any networking or resource based i/o or manipulation except textures for 3D objects. Is it possible that memory allocation while running the program is creating some problem?
Basically I am just trying to print the touch point. But I am clueless as to why I can’t create a QList. The code compiles fine. I tried my best (unsuccessfully), but is there any other way to get the screen coordinates of a touchpoint (one that does not require a QList)? Any comments are welcome.
[Reposting from qt-project.org.]
Your syntax is 100% correct. Just look at this example: http://www.developer.nokia.com/Community/Wiki/Painting_in_Qt
What I'm guessing happens is that QTouchEvent::touchPoints() returns a list big enough that it overflows your stack. Try increasing the stack size for your application.
Is your syntax correct ? The compilation error seems to reinforce teukkam point...
What happens when you replace
static_cast<QTouchEvent *>(event)->touchPoints()
With
(dynamic_cast<QTouchEvent *>(event))->touchPoints()
Notice the parentheses...