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QTconcurrent & XInitThreads problem

  • I launch from a gui with kplot a libmodbus connection that give to my applicatio data to plot.

    to make the connection and receive the data I use qtconcurrent to go in parallel the guidance and reception.

    qt applicatio run on ubuntu12.04 an I use -lX11 and XInitThreads() funtion to facilitate the use of qtconcurrent ... but the debug give me this error:

    @[xcb] Unknown request in queue while dequeuing
    [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
    [xcb] Aborting, sorry about that.
    miapplicazioneQT: ../../src/xcb_io.c:178: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed.

    Can you tell why

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