On Feb 6, 2010, at 8:31 PM, David MacMahon wrote: > Hi, Hazen, > > On Feb 6, 2010, at 8:40 , Hazen Babcock wrote: > >> The gist of it is this statement: >> "if the CoreFoundation library's being initialized - perhaps as a >> result >> of that library being loaded as a dependent of some other library - >> and >> the current thread is not the initial thread, waste everyone's >> time by >> executing a breakpoint instruction." > > It sounds like this occurs when a multi-threaded program that is not > linked with CoreFoundation dynamically loads a library that depends > on CoreFoundation from within a thread other than the initial thread. > >> So, if you try to use Plplot with the Aquaterm driver, which in turn >> will try to load the CoreFoundation library, in a threaded >> environment >> your process will crash. > > From my reading of the article excerpted above, this is true only if > the program calls PLplot from a non-initial thread to load the > aquaterm driver. And it's only true if executing the breakpoint > instruction causes a crash. Maybe the breakpoint instruction gets > trapped somehow so that the main thread can load CoreFoundation? > > Have you actually experienced a crash due to this on Snow Leopard or > are you expressing concern about a potential crash?
I have not personally experienced this but a user of cl-plplot (the lisp bindings for Plplot) ran into this problem. If you are running a multi-threaded lisp process in a terminal window (a pretty common way to run lisp) and then try and use the aquaterm driver in Plplot the lisp process will crash with a "Trace / BPT trap" message. >> Perhaps the onus is on us to somehow figure out >> if the CoreFoundation library has already been loaded and avoid >> reloading it? Or maybe that is just not possible? > > If it's already been loaded, no problem. If it hasn't been loaded > and PLplot loads the aquaterm driver, that will load CoreFoundation. > > This is probably not unique to the aquaterm driver. I think loading > the xcairo driver also ends up loading CoreFoundation if it hasn't > been loaded already, so that too would be subjected to this behavior. The user said that the xwin driver was ok, so maybe the xcairo driver will work as well? -Hazen ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
