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IDProjectCategoryView StatusDate SubmittedLast Update
0011893ParaViewBugpublic2011-02-24 07:552011-05-17 20:43
ReporterMattijs 
Assigned ToDavid Partyka 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionno change required 
Platformx86_64OSlinuxOS Versionubuntu10.04.1 64
Product VersionDevelopment 
Target VersionFixed in Version 
Summary0011893: reader modules cannot use dlopen themselves
DescriptionMy reader module uses dlopen to load in some additional functionality. Because in DynamicLoader the dlopen does not export all symbols of the loaded reader this fails.

To resolve I've added an RTLD_GLOBAL to the dlopen call:

in TK/Utilities/kwsys/DynamicLoader.cxx, in DynamicLoader::OpenLibrary

change to:

  return dlopen(libname, RTLD_LAZY|RTLD_GLOBAL);

Mattijs
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  Notes
(0025809)
Mattijs (reporter)
2011-03-18 13:33

 With RTLD_GLOBAL I do get an error when I exit paraview (after loading our reader):

Inconsistency detected by ld.so: dl-close.c: 731: _dl_close: Assertion `map->l_init_called' failed!
Does paraview dlclose the loaded libraries?

B.t.w. if you need me to do some tests please let me know.

Mattijs
(0025885)
Mattijs (reporter)
2011-03-23 11:35

 I don't get this error in Paraview-3.8.0, I do get it with Paraview-3.10 or last weeks' git version.
(0025954)
Brad King (developer)
2011-03-29 11:00

 It's been RTLD_LOCAL (by default due to lack of RTLD_GLOBAL) since the dynamic loader was written in 1999. Plugins from different vendors may conflict with one another's symbols. That's why each plugin is isolated. The proposed case is a plugin to a plugin which has never been supported.
(0025955)
Mattijs (reporter)
2011-03-29 11:08

 Makes sense. I can work around the RTLD_GLOBAL problem by making sure my own reader module is linked against enough libraries.

I still have the problem that since 3.10 or so even with RTLD_LOCAL I get above error upon exit from paraview. Any reason why this doesn't happen with 3.8? Did anything (relevant) change?

Thanks,

Mattijs
(0026468)
David Partyka (developer)
2011-05-09 11:31

 See Comments.
(0026530)
Alan Scott (manager)
2011-05-17 20:43

 agree. no change required.

 Issue History
Date Modified Username Field Change
2011-02-24 07:55 Mattijs New Issue
2011-03-18 12:59 David Partyka Assigned To => David Partyka
2011-03-18 12:59 David Partyka Status backlog => tabled
2011-03-18 13:33 Mattijs Note Added: 0025809
2011-03-23 11:35 Mattijs Note Added: 0025885
2011-03-29 11:00 Brad King Note Added: 0025954
2011-03-29 11:08 Mattijs Note Added: 0025955
2011-05-09 11:31 David Partyka Note Added: 0026468
2011-05-09 11:31 David Partyka Status tabled => @80@
2011-05-09 11:31 David Partyka Resolution open => no change required
2011-05-17 20:43 Alan Scott Note Added: 0026530
2011-05-17 20:43 Alan Scott Status @80@ => closed

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