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  1. Qt
  2. QTBUG-63822

xCode 9: Main Thread Checker warnings

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Done
    • Affects Version/s: 5.9.2, 5.10.0 Beta 1
    • Fix Version/s: 5.9.3, 5.10
    • Component/s: QPA
    • Labels:
      None
    • Platform/s:
      iOS/tvOS/watchOS

      Description

      xCode 9 introduced a new tool which checks UI thread access: https://developer.apple.com/documentation/code_diagnostics/main_thread_checker.

      When starting a Qt project from xCode then the checker outputs several warnings like this:

      2017-10-17 08:12:12.482151+0200 mapproblem[306:9393] [DYMTLInitPlatform] platform initialization successful
      JIT is disabled for QML. Property bindings and animations will be very slow. Visit https://wiki.qt.io/V4 to learn about possible solutions for your platform.
      stale focus object QObject(0x0) , doing manual update
      2017-10-17 08:12:13.701932+0200 mapproblem[306:9182] refreshPreferences: HangTracerEnabled: 0
      2017-10-17 08:12:13.702360+0200 mapproblem[306:9182] refreshPreferences: HangTracerDuration: 500
      2017-10-17 08:12:13.702647+0200 mapproblem[306:9182] refreshPreferences: ActivationLoggingEnabled: 0 ActivationLoggingTaskedOffByDA:0
      =================================================================
      Main Thread Checker: UI API called on a background thread: -[UIView layer]
      PID: 306, TID: 9433, Thread name: QSGRenderThread, Queue name: com.apple.root.default-qos.overcommit, QoS: 21
      Backtrace:
      4   mapproblem                          0x0000000100d3628c _ZNK10QIOSWindow9eaglLayerEv + 48
      5   mapproblem                          0x0000000100d3ed64 _ZNK11QIOSContext23needsRenderbufferResizeEP16QPlatformSurface + 152
      6   mapproblem                          0x0000000100d3e860 _ZN11QIOSContext11makeCurrentEP16QPlatformSurface + 740
      7   mapproblem                          0x0000000100d3f074 _ZThn16_N11QIOSContext11makeCurrentEP16QPlatformSurface + 36
      8   mapproblem                          0x00000001018ab6b0 _ZN14QOpenGLContext11makeCurrentEP8QSurface + 488
      9   mapproblem                          0x000000010123b6a8 _ZN15QSGRenderThread3runEv + 408
      10  mapproblem                          0x0000000101d4606c _ZN14QThreadPrivate5startEPv + 788
      11  libsystem_pthread.dylib             0x000000018498032c <redacted> + 308
      12  libsystem_pthread.dylib             0x00000001849801f8 <redacted> + 0
      13  libsystem_pthread.dylib             0x000000018497ec38 thread_start + 4
      

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            People

            Assignee:
            vestbo Tor Arne Vestbø
            Reporter:
            DanielSt Peter Staab
            Votes:
            3 Vote for this issue
            Watchers:
            8 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved:

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