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Qt Embedded 4.8.5 cannot open display lock

  • We are running a Qt Embedded 4.8.5 application on Android 9 OSP and seeing this error:

    QLock::QLock: Cannot create semaphore /tmp/qtembedded-0/QtEmbedded-0 'd' (38, Function not implemented)
    Cannot get display lock

    despite enabling SYSVIPC in the underlying Linux kernel.

  • Lifetime Qt Champion


    Did you implement the code as well in Qt ?
    By the way, if your are locked to Qt 4, at least consider using the latest version of that series.

  • Hi.
    Yes, the code is implemented using Qt 4.8.5. We can try with 4.8.7. Thanks.

  • We didn't have to upgrade to Qt 4.8.7 as were using the Android 9 kernel that doesn't use System V IPC where we assumed we were using Linux kernel with system V enabled. Pointing to the correct kernel in the build fixed the issue.

  • Lifetime Qt Champion

    Nice !

    Note that the upgrade is still a good idea since you are using an outdated version of Qt. Even more, it has reached end of life a long time ago.

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