Question

我最近作为以下问题，我发现线程中的对象在线程被杀之前没有被删除的问题：

Thread count increases a lot, even when deleting the threads

我决定将对象移动到主线程，然后删除它：

void WorkspaceBase::deleteFinishedUploader() {
    FileUploader *fileUploader = qobject_cast<FileUploader*>(sender());

    if(fileUploader != NULL) {
        fileUploader->moveToThread(this->thread());
        fileUploader->deleteLater();
    }
}

在Windows中，我从未收到任何警告，似乎工作正常。现在在OSX中，我得到以下警告eveytime：

On Mac OS X, you might be loading two sets of Qt binaries into the same process. Check that all plugins are compiled against the right Qt binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one set of binaries are being loaded.
QObject::moveToThread: Current thread (0x102a07180) is not the object's thread (0x116428090).
Cannot move to target thread (0x102a07180)

我不太清楚问题是什么，但我会尽力描述我的项目。

首先，我有一个共享的dylib，由我的其他dylib和app使用。另一个dylib使用Shared.dylib，并在将内容上传到互联网（QNetworkAccessManager等）时包含所有功能。然后我有我的应用程序，其中包括此dylib，以及shared.dylib（其中包含一些帮助方法和解析器）。这些库以及来自boost和qjson.framework的date_time.dylib被添加到.app-package中。

所有东西都构建和运行完美，只有当我试图将Uploader对象移动到发生此问题的主线程时。 Uploader对象是App可执行文件的一部分，不在.dylib中（但它使用libs进行上载）。

这可能是什么问题？不确定我以前是否遇到过这个问题而且我不太清楚我做了什么。如果我提供的信息不够，我很乐意添加更多信息。当我不知道问题是什么时，很难知道在哪里看。

谢谢！

编辑：

这些是我在运行时加载的库：

dyld: loaded: /Users/me/Documents/MyApp/MyApp.app/Contents/MacOS/./MyApp
dyld: loaded: /Users/me/Documents/MyApp/MyApp.app/Contents/MacOS/qjson.framework/Versions/0/qjson
dyld: loaded: /Users/me/Documents/MyApp/MyApp.app/Contents/MacOS/libboost_date_time.dylib
dyld: loaded: /Users/me/Documents/MyApp/MyApp.app/Contents/MacOS/libQt.Shared.1.dylib
dyld: loaded: /Users/me/Documents/MyApp/MyApp.app/Contents/MacOS/libQt.Framework.Network.1.dylib
dyld: loaded: /Users/me/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/lib/QtGui.framework/Versions/4/QtGui
dyld: loaded: /Users/me/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/lib/QtCore.framework/Versions/4/QtCore
dyld: loaded: /Users/me/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/lib/QtNetwork.framework/Versions/4/QtNetwork
dyld: loaded: /usr/lib/libstdc++.6.dylib
dyld: loaded: /usr/lib/libSystem.B.dylib
dyld: loaded: /usr/lib/libz.1.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
dyld: loaded: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
dyld: loaded: /System/Library/Frameworks/Security.framework/Versions/A/Security
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
dyld: loaded: /usr/lib/system/libmathCommon.A.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreText.framework/Versions/A/CoreText
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSync.framework/Versions/A/ColorSync
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/QD.framework/Versions/A/QD
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/SpeechSynthesis.framework/Versions/A/SpeechSynthesis
dyld: loaded: /usr/lib/libbsm.0.dylib
dyld: loaded: /usr/lib/libicucore.A.dylib
dyld: loaded: /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
dyld: loaded: /usr/lib/system/libkxld.dylib
dyld: loaded: /usr/lib/libauto.dylib
dyld: loaded: /usr/lib/libobjc.A.dylib
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Metadata
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/OSServices
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchKit.framework/Versions/A/SearchKit
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/AE.framework/Versions/A/AE
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/LaunchServices
dyld: loaded: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices
dyld: loaded: /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
dyld: loaded: /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
dyld: loaded: /usr/lib/libsqlite3.dylib
dyld: loaded: /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
dyld: loaded: /usr/lib/libxslt.1.dylib
dyld: loaded: /usr/lib/libxml2.2.dylib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvDSP.dylib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
dyld: loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
dyld: loaded: /usr/lib/libcrypto.0.9.8.dylib
dyld: loaded: /System/Library/PrivateFrameworks/TrustEvaluationAgent.framework/Versions/A/TrustEvaluationAgent
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontParser.dylib
dyld: loaded: /usr/lib/libcups.2.dylib
dyld: loaded: /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
dyld: loaded: /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
dyld: loaded: /usr/lib/libresolv.9.dylib
dyld: loaded: /Users/annatisch/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/lib/QtXml.framework/Versions/4/QtXml
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
dyld: loaded: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels.framework/Versions/A/CommonPanels
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Help.framework/Versions/A/Help
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture.framework/Versions/A/ImageCapture
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/OpenScripting.framework/Versions/A/OpenScripting
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI
dyld: loaded: /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecognition.framework/Versions/A/SpeechRecognition
dyld: loaded: /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
dyld: loaded: /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
dyld: loaded: /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/DesktopServicesPriv
dyld: loaded: /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
dyld: loaded: /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyControls
dyld: loaded: /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
dyld: loaded: /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib
dyld: loaded: /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL
dyld: loaded: /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreVMClient.dylib
dyld: loaded: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGFXShared.dylib
dyld: loaded: /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
dyld: loaded: /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
dyld: loaded: /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib
dyld: loaded: /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoundation
dyld: loaded: /System/Library/Frameworks/OpenDirectory.framework/Versions/A/OpenDirectory
dyld: loaded: /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/CommerceCore.framework/Versions/A/CommerceCore
dyld: loaded: /System/Library/Frameworks/OpenDirectory.framework/Versions/A/Frameworks/CFOpenDirectory.framework/Versions/A/CFOpenDirectory
dyld: loaded: /System/Library/PrivateFrameworks/PasswordServer.framework/Versions/A/PasswordServer
dyld: loaded: /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryService
dyld: loaded: /usr/lib/libsasl2.2.dylib
dyld: loaded: /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
dyld: loaded: /usr/lib/liblangid.dylib
dyld: loaded: /usr/lib/libiconv.2.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ColorSync.framework/Versions/A/Resources/ColorSyncDeprecated.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
dyld: loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib
 QDir( 
dyld: loaded: /Users/me/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/plugins/bearer/libqcorewlanbearer.dylib
dyld: loaded: /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLAN
dyld: loaded: /Users/me/QtSDK1.2.1/Desktop/Qt/4.8.1/gcc/plugins/bearer/libqgenericbearer.dylib
dyld: loaded: /usr/lib/libssl.0.9.8.dylib

我看不到任何重复，所以它必须与移动对象有关。我怎样才能将对象从主线程移动到主线程。我已经读过某个地方，出于安全原因这是不可能的，但我真的需要移动它以便它可以完全删除（这意味着它需要一个事件循环，而不是它当前的QThread会被杀死）

Answer 1

来自QObject的文档：

警告：此功能不是线程安全的;当前线程必须与当前线程关联性
相同

所有者必须致电moveToThread以放弃对象的所有权，而不是声称拥有该对象的另一个线程。也就是说，您必须从拥有对象的任何线程中调用moveToThread（默认情况下创建对象）。另请注意，您无法移动包含父项的对象。

Answer 2

您也可以通过对象的所有者线程将其移动到您的主题。

#include <thread>
#include <memory>
#include <condition_variable>
#include <QTimer>
#include <QThread>
#include <QApplication>


template <typename Func>
inline void runOnThread(QThread *qThread, Func &&func)
{
    QTimer *t = new QTimer();
    t->moveToThread(qThread);
    t->setSingleShot(true);
    QObject::connect(t, &QTimer::timeout, [=]()
    {
        func();
        t->deleteLater();
    });
    QMetaObject::invokeMethod(t, "start", Qt::QueuedConnection, Q_ARG(int, 0));
}



void moveToThread(QObject *ptr, QThread *targetThrd=QThread::currentThread())
{
    std::mutex mt;
    std::condition_variable_any cv;
    runOnThread(ptr->thread(),[&]
    {
        ptr->setParent(NULL);
        ptr->moveToThread(targetThrd);
        cv.notify_one();
    });
    cv.wait(mt);
}

你只需要打电话

moveToThread( fileUploader, this->thread());

移至线程导致问题

2 个答案: