Re: XForms: xforms and threads

From: eddie (eddie@brandeis.edu)
Date: Tue May 27 2003 - 16:08:31 EDT

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    # To subscribers of the xforms list from eddie <eddie@brandeis.edu> :

    Merci pour la reponse rapide :)

      Well, the actual calls to the XForms library are not being made by any
    other thread than the same one (and only) thread that runs the graphical
      application. Other threads call a method from my graphical
    application, which then does things to the forms. I even took care of:
      * using pthread mutexes in some places (but maybe in not enough places)
      * freezing forms

    The puzzle I am trying to solve currently is actually that I can't even
    *run* my program once I add XInitThreads() -- as it said in my original
    mail, fl_check_forms just never returns ... any idea on that?

      - Eddie

    Nicolas Castagné wrote:
    > # To subscribers of the xforms list from
    > =?ISO-8859-1?Q?Nicolas_Castagn=E9?= <nicolas.castagne@imag.fr> :
    >
    > Hi Eddie,
    >
    > i do not have the time now to give a close look to your gdb backtrace.
    >
    > However...
    >
    > Note that XForms and X11 are not 'thread safe', in the sense you should
    > not perform calls to the XForms or X11 libs from different threads. The
    > graphic calls and event handling should be performed in a single
    > thread. Threads sould be used only to manage the core of your
    > application (such as computing datas, handling files, etc.).
    >
    >
    > In addition, note :
    > 1) that since OpenGL is somehow thread-safe, you may manage GL objects
    > from different threads (provided you are carreful). You may find
    > various "threads" cocnerning that point in the list archive
    > http://bob.usuhs.mil/mailserv/list-archives/ .
    > 2) that most GUI toolkits you may use have the same 'problem', as far
    > as I know.
    >
    >
    > Wish it could help !
    >
    > Nicolas
    >
    > Le mardi, 27 mai 2003, à 20:51 Europe/Paris, eddie a écrit :
    >
    >> I added XInitThreads() before I create the thread that runs this
    >> entire application, but now the program, without the application
    >> actually beginning to send data to these forms, 'hangs' at the main
    >> loop:
    >>
    > ------------------------------------------------------------------------
    > --------------------------
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