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  1. Qt
  2. QTBUG-84619

Use of global thread pool for image conversion is changes behavior in Qt5.15

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Details

    • Windows
    • 87d32424de2f471a520c1f3ba0c3035fbff7ee06 (qt/qtbase/dev) 9d2b474b5f6aa07ee731d28f9774d10dfaa49b32 (qt/qtbase/5.15)

    Description

      Qt 5.15.0 since image conversion is using global thread leading to dead lock in some situation where large number of image files are being read and QFuture and watchers are being used to parallelize it.

      Attached example can be used to reproduce it on windows, this works good with 5.14
      Mostlikerly this change is the reason of it:
      https://codereview.qt-project.org/c/qt/qtbase/+/282332

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-84857 Deadlock occurs when QImage::scaled is called in QtConcurrent::run

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-85164 Image resizing hangs

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-85668 Qt 5.15 multithreading issue when rescale images

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-87338 image scaling example freezes

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          For Gerrit Dashboard: QTBUG-84619
          # Subject Branch Project Status CR V
          302569,3 Do not multithread if already in a global threadpool thread dev qt/qtbase Status: MERGED +2 0
          302780,2 Do not multithread if already in a global threadpool thread 5.15 qt/qtbase Status: MERGED +2 0

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            People

              allan.jensen Allan Sandfeld Jensen
              irfan.omair@digia.com Irfan Omair
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              Dates

                Created:
                Updated:
                Resolved:

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