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  1. Qt
  2. QTBUG-18434

QObject::deleteLater called from a function scheduled by g_idle_add --> QObject won't get deleted the next time the main loop spins

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.8.0 Alpha
    • 4.7.3, 5.4.0
    • Core: Event loop
    • None

    Description

      The attached source code
      1. schedules a function to be called with g_idle_add
      2. when the function is called, calls deleteLater on a QObject
      3. spins the main loop (QCoreApplication::exec()) the rest of the time

      Expected outcome:
      The dtor of the QObject in question is called right after the deleteLater, when the main loop spins the next time.

      Actual outcome:
      The dtor of the QObject in question is called only after QCoreApplication::quit() has been called.

      The program prints out:
      main thread is QThread(0x922c488)
      created Sender(0x922f918)
      it's thread affinity: QThread(0x922c488)
      adding idle callback QThread(0x922c488)
      calling QCoreApplication::exec
      callback QThread(0x922c488)

      And after 3 s:
      destroyed Sender(0x922f918)
      QCoreApplication::exec returned

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-30200 tst_qapplication: testDeleteLaterProcessEvents deleteLaterAndExitLoop fails on Linux (Non-Glib-EventDispatcher)

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-25752 Application hangs when emit signal on Linux in g_main_context_wakeup

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-32859 DeferredDelete events not handled when created by GLib dispatched events

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          resulted in

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-120124 Improvements to deferred deletions / deleteLater()

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
          For Gerrit Dashboard: QTBUG-18434
          # Subject Branch Project Status CR V
          142309,24 Fix for deferredDelete() bug when calling the glib loop directly dev qt/qtbase Status: MERGED -2 0
          145970,4 Events from outside main loop need higher loopLevel dev qt/qtbase Status: ABANDONED -1 0
          149561,1 Fix for deferredDelete() bug when calling the glib loop directly 5.7 qt/qtbase Status: ABANDONED 0 0
          150527,3 Fix warnings about constructor initialization order in tst_QObject. 5.7 qt/qtbase Status: MERGED +2 0

          Activity

            People

              paangele Paolo Angelelli
              marja Marja Hassinen
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              Dates

                Created:
                Updated:
                Resolved:

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