c++ - スレッドに移動すると問題が発生します

Question

私は最近、スレッドが強制終了される前にスレッド内のオブジェクトが削除されないという問題があった次の質問として:

次のようにオブジェクトを削除する前に、オブジェクトをメインスレッドに移動することにしました。

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

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

Windowsでは、警告は表示されず、正常に動作しているようです。OSXでは、これが行われるたびに次の警告が表示されます。

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)

問題が何であるかはよくわかりませんが、私のプロジェクトをできる限り説明しようとします。

まず、他の dylib とアプリで使用される共有 dylib があります。もう 1 つの dylib は Shared.dylib を使用し、インターネットにアップロードする際のすべての機能 (QNetworkAccessManager など) を含みます。次に、この dylib と shared.dylib (いくつかのヘルパーメソッドとパーサーを含む) を含むアプリを作成します。これらのライブラリは、boost および qjson.framework の date_time.dylib とともに、.app-package に追加されます。

すべてが完全にビルドおよび実行され、この問題が発生するのは、アップローダーオブジェクトをメインスレッドに移動しようとしているときだけです。Uploader オブジェクトはアプリの実行可能ファイルの一部であり、.dylib にはありません (ただし、ライブラリを使用してアップロードを行います)。

ここで何が問題になる可能性がありますか？以前にこの問題が発生したかどうかはわかりません。また、何をしたかもよくわかりません。提供した情報が十分でない場合は、喜んで追加します。何が問題なのかわからない場合、どこを見ればよいかわかりません。

ありがとう！

編集：

これらは、実行時にロードするライブラリです。

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

重複が見られないので、オブジェクトの移動に関係しているに違いありません。オブジェクトをメインスレッドからメインスレッドに移動するにはどうすればよいでしょうか。セキュリティ上の理由からこれは不可能だとどこかで読んだことがありますが、完全に削除できるように移動する必要があります（つまり、現在のQThreadではないイベントループが必要であり、殺されます）

score 6 · Accepted Answer

QObjectのドキュメントから:

警告: この関数はスレッドセーフではありません。現在のスレッドは、現在のスレッドアフィニティと同じでなければなりません

moveToThread所有者は、別のスレッドがオブジェクトの所有権を主張するのではなく、オブジェクトの所有権を放棄するために呼び出す必要があります。つまり、オブジェクトを所有している (デフォルトではオブジェクトを作成moveToThreadした)スレッドから呼び出す必要があります。また、親を持つオブジェクトは移動できないことに注意してください。

c++ - スレッドに移動すると問題が発生します

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