How to cancel the processing gegl

[史龙 <jiewuxiaozi2009@xxxxxxxxx>]

Hi All,

Example:

GeglNode *node1 = NULL;

    GeglNode    *node2      = NULL;

    node1 = gegl_node_new_from_xml (pXmlData, NULL);

    node2 = gegl_node_new_child (node1,

                                            "operation", "gegl:convert-format",

                                            "format", "B'aG'aR'aA u8",

                                            NULL);

    node3 = gegl_node_new_child (node1,

                                            "operation", "gegl:buffer-sink",

                                            "buffer", &buffer,

                                            NULL);

    gegl_node_link_many (node1, node2, node2,  NULL);

    GeglProcessor *processor = gegl_node_new_processor (node3, NULL);

    while (gegl_processor_work (processor, &progress))

    {

        if(callBack != NULL){

            callBack(progress * 100);

        }

    }

   Excuse me!

   How do I cancel "gegl_node_new_processor" and "gegl_processor_work" work

							Thanks

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