[Pidgin] #8770: Jump to invalid address in tcl plugin

[Pidgin]

#8770: Jump to invalid address in tcl plugin
-------------------------+--------------------------------------------------
     Reporter:  cavedon  |        Type:  defect 
       Status:  new      |   Component:  plugins
      Version:  2.5.5    |    Keywords:         
Launchpad_bug:           |  
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 The Tcl library, invoked by the tcl plugin, install a destructor function
 which is called when the invoking thread is destroyed. This happens in
 tclUnixThrd.c, TclpGetAllocCache()
 {{{
 pthread_key_create(&key, TclpFreeAllocCache);
 }}}

 Right now, if you call purple_core_quit(), the tcl.so library gets
 unloaded, so when the thread is destroyed, the no longer existent
 TclpFreeAllocCache() will be called.

 I am attaching patch that uses the same hack as perl plugin to prevent
 unloading of tcl.so.

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Ticket URL: <http://developer.pidgin.im/ticket/8770>
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