how to terminate an ongoing QProcess that is running inside a QThread and gets deleted by another QThread? I even inserted a QMutex extCmdProcessLock, which should avoid the destruction of the DbManager before the extCmdProcess could finish or timeout. I get a segmentation fault on "waitForStarted" if another thread calls delete on DbManager. I cannot use signals (I think) because I use the external command inside a sequential data process. Thank you very much for any help!
DbManager::extCmd(){
...
QMutexLocker locker(&extCmdProcessLock);
extCmdProcess = new QProcess(this);
QString argStr += " --p1=1"
+ " --p2=3";
extCmdProcess->start(cmd,argStr.split(QString(" ")));
bool startedSuccessfully = extCmdProcess->waitForStarted();
if (!startedSuccessfully) {
extCmdProcess->close();
extCmdProcess->kill();
extCmdProcess->waitForFinished();
delete extCmdProcess;
extCmdProcess = NULL;
return;
}
bool successfullyFinished = extCmdProcess->waitForFinished(-1);
if (!successfullyFinished) {
qDebug() << "finishing failed"; // Appendix C
extCmdProcess->close();
extCmdProcess->kill();
extCmdProcess->waitForFinished(-1);
delete extCmdProcess;
extCmdProcess = NULL;
return;
}
extCmdProcess->close();
delete extCmdProcess;
extCmdProcess = NULL;
}
DbManager::~DbManager(){
qDebug() << "DB DbManager destructor called.";
QMutexLocker locker(&extCmdProcessLock);
if (extCmdProcess!= NULL){
this->extCmdProcess->kill(); // added after Appendix A
this->extCmdProcess->waitForFinished();
}
}
附录A: I also get the mistake "Qprocess: destroyed while process is still running." 我读到,这可能意味着在等待启动命令未完成时执行我其他线条中的“ 删除 dbmanager” 呼叫 。 但我真的想知道为什么我的毁灭器中的杀死() 命令没有解决这个问题 。 @ info: tooltip
附录B: 根据评论,添加了 wait forfinished () <()/code>。可悲的是,程序终止仍然不能正常关闭,分割错误发生在 waitforstarted() 或以下的 start() <()/code>本身。
#0 0x00007f25e03a492a in QEventDispatcherUNIX::registerSocketNotifier () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#1 0x00007f25e0392d0b in QSocketNotifier::QSocketNotifier () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#2 0x00007f25e0350bf8 in ?? () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#3 0x00007f25e03513ef in ?? () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#4 0x00007f25e03115da in QProcess::start () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#5 0x0000000000428628 in DbManager::extCmd()
#6 0x000000000042ca06 in DbManager::storePos ()
#7 0x000000000044f51c in DeviceConnection::incomingData ()
#8 0x00000000004600fb in DeviceConnection::qt_metacall ()
#9 0x00007f25e0388782 in QObject::event () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#10 0x00007f25e0376e3f in QCoreApplicationPrivate::notify_helper () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#11 0x00007f25e0376e86 in QCoreApplication::notify () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#12 0x00007f25e0376ba4 in QCoreApplication::notifyInternal () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#13 0x00007f25e0377901 in QCoreApplicationPrivate::sendPostedEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#14 0x00007f25e03a4500 in QEventDispatcherUNIX::processEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#15 0x00007f25e0375e15 in QEventLoop::processEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#16 0x00007f25e0376066 in QEventLoop::exec () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#17 0x00007f25e0277715 in QThread::exec () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#18 0x00007f25e027a596 in ?? () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#19 0x00007f25df9b43f7 in start_thread () from /lib/libpthread.so.0
#20 0x00007f25def89b4d in clone () from /lib/libc.so.6
#21 0x0000000000000000 in ?? ()
Appendix C: The debug output showed me, that the error message: QProcess: Destroyed while process is still running. always appears, when the finishing failed output appears. This means that my locks or/and kill attempts to protect the QProcess are failing. Questions I wonder about:
a) 如果创建并启动一个处理对象, 我的 < code> extCmdProcessLock 是否解锁? 我已经尝试使用普通的 < code> lock () 调用, 而不是
(b) 文档说,如果我这样使用进程,main 线 将会被停止。它们是否真的指“em>main 线 或启动进程时的线?
QProcess 是否在多线性环境中不适用? 如果两个线条创建了 QProcess 对象并运行它, 它们会干扰吗? 也许该对象是静态的?
谢谢你帮忙填补知识漏洞,我真希望解开这个谜题
<强> 附录D: 从任何线索删除任何删除和删除 Later () 后, 我的程序仍然被打碎 。
#0 0x00007fc94e9796b0 in QProcess::setProcessState () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#1 0x00007fc94e97998b in QProcess::waitForStarted () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#2 0x00007fc94e979a12 in QProcess::waitForFinished () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#3 0x0000000000425681 in DbManager::extCmd()
#4 0x0000000000426fb6 in DbManager::storePos ()
#5 0x000000000044d51c in DeviceConnection::incomingData ()
#6 0x000000000045fb7b in DeviceConnection::qt_metacall ()
#7 0x00007fc94e9f4782 in QObject::event () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#8 0x00007fc94e9e2e3f in QCoreApplicationPrivate::notify_helper () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#9 0x00007fc94e9e2e86 in QCoreApplication::notify () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#10 0x00007fc94e9e2ba4 in QCoreApplication::notifyInternal () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#11 0x00007fc94e9e3901 in QCoreApplicationPrivate::sendPostedEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#12 0x00007fc94ea10500 in QEventDispatcherUNIX::processEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#13 0x00007fc94e9e1e15 in QEventLoop::processEvents () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#14 0x00007fc94e9e2066 in QEventLoop::exec () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#15 0x00007fc94e8e3715 in QThread::exec () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#16 0x00007fc94e8e6596 in ?? () from /usr/local/Trolltech/Qt-4.7.4/lib/libQtCore.so.4
#17 0x00007fc94e0203f7 in start_thread () from /lib/libpthread.so.0
#18 0x00007fc94d5f5b4d in clone () from /lib/libc.so.6
#19 0x0000000000000000 in ?? ()