[Tcl-bugs] [ tcl-Feature Requests-674514 ] Is Tcllib thread safe? - code analysis, flaw detection

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Feature Requests item #674514, was opened at 2003-01-25 10:30
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Category: 80. Thread Package
Group: None
Status: Open
Resolution: Later
Priority: 5
Submitted By: Markus Elfring (elfring)
Assigned to: Zoran Vasiljevic (vasiljevic)
>Summary: Is Tcllib thread safe? - code analysis, flaw detection

Initial Comment:
Do you know which functions of the Tcl Standard Library can be used 
safely (no extra synchronization needed) with Tcl threads?
When 
will the information be added to the documentation 
(http://tcllib.sourceforge.net/doc/index.html)whether a function in 
this application programming interface is thread-safe or 
asynchronous-safe or not?

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>Comment By: Markus Elfring (elfring)
Date: 2003-01-27 13:44

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1. Is there a source file that might be not thread-safe and not 
asynchronous-safe because it was written in a programming 
language like C oder C++?

3. Are the source files that are not written in TCL checked with 
tools like the following?
- http://splint.org/
- http://www.garret.ru/~knizhnik/jlint/ReadMe.htm#introduction
- http://www.cs.utexas.edu/users/emery/#broadway


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Comment By: Markus Elfring (elfring)
Date: 2003-01-26 14:29

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1. Is the library "Tcllib" written in "pure Tcl code"?

2. Please add your 
answers to the documentation.
   I would like to see there a general 
statement about reentrant, thread-safe and asynchronous-safe 
functions.
- http://www.gnu.org/software/pth/pth-manual.html#the 
world of threading
- 
http://www.tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_HTML/ARH9RBTE/DOCU0008.HTM#nonthreaded

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Comment By: Jeffrey Hobbs (hobbs)
Date: 2003-01-25 21:23

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All pure Tcl code is thread-safe due to the nature of the core.

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Comment By: Zoran Vasiljevic (vasiljevic)
Date: 2003-01-25 10:48

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Generally speaking, all Tcl code should be thread-safe. 
It is the C-code which makes (might make) problems. 
Also very important to note is the Tcl "cd" command, which 
although thread-safe per-se, changes the process current 
directory for every thread in the process and is, thus, source 
of potential problems.  
 

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