[Tcl-bugs] [ tcl-Bugs-710642 ] Thread-unsafe handling of cwdPathPtr

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Bugs item #710642, was opened at 2003-03-27 01:27
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=710642&group_id=10894

Category: 34. Pathname Management
Group: 8.4.2
Status: Open
Resolution: None
Priority: 9
Submitted By: Zoran Vasiljevic (vasiljevic)
Assigned to: Vince Darley (vincentdarley)
Summary: Thread-unsafe handling of cwdPathPtr

Initial Comment:
The new pluggable filesystem code located in
generic/tclIOUtils.c naively plays with global
Tcl_Obj*, passing them between threads
per-reference and neglecting the proper locks
for all except write operations. 
The spot in question is the global Tcl_Obj *cwdPathPtr.

The net-effect is that paths passed to the OS-calls 
gets garbled, memory is being trashed leading to
process exitus and whole bunch of other ugly things
is happening.

I think this has to be entirely revised, as one can not
simply share Tcl_Objs between threads. One has to 
always make a deep-copy (w/o internal references) 
of the object before passing it to some other thread.

I have some ideas on how to solve this, but it is 
really not that straight-forward, since few of design
issues have to be modified.

This bug is really a show-stopper for MT-apps
therefore the highest priority.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=710642&group_id=10894