Article # 425, added by Geoworks, historical record
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UI object trees crossing thread boundaries.
Q. I dynamically instantiate the generic objects in an object block owned by the process thread. I would like to display those objects and thus I need to attach them to the UI tree. However, the UI tree is owned by the ui-thread. Simply attaching these objects to the tree causes the error "OBJ_LOCK_OBJ_BLOCK_BY_WRONG_THREAD". A. You cannot have normal generic objects under your GenApplication running in a different thread from the GenApplication objects and the objects underneath it. The only place where a thread boundary is allowed is the GenView/Content. The right thing to do is to change the owning thread of your object block to the ui-thread. Another way of overcoming this is to make the app single threaded, so everything is in the same thread.