[Tcl-bugs] [ tcl-Feature Requests-612513 ] Detect deadlocks with TCL

[<no...@so...>]

Feature Requests item #612513, was opened at 2002-09-21 16:45
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Category: 80. Thread Package
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Markus Elfring (elfring)
Assigned to: Zoran Vasiljevic (vasiljevic)
Summary: Detect deadlocks with TCL

Initial Comment:
I've read under "http://java.sun.com/j2se/1.4.1/changes.html#vm" about a utility that can detect deadlocks 
with the programming language "Java". (Example listing: 
http://java.sun.com/j2se/1.4.1/sample-output.html)

Can a similar tool be offered for the programming language "TCL"?

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>Comment By: Markus Elfring (elfring)
Date: 2002-12-28 22:58

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Damned - The pthread interface does not offer any function to query the 
thread and lock usage.
1. I am wondering now why this was not 
introduced into POSIX 1003.1c after this standard was available for so many 
years.
2. I'm curious for your TIP. I hope that the TCL community will find 
an other function library to retrieve the requested information.

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Comment By: Zoran Vasiljevic (vasiljevic)
Date: 2002-12-28 19:40

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Detecting deadlock may be done be wrapping the mutex API 
i.e. providing your own set of mutex operations. 
This would, however, slow down the application.  
I might put this into the TIP I'm preparing about the  
Tcl threading API. This may be then conditionaly compiled 
for debugging purposes. 
 

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Comment By: Markus Elfring (elfring)
Date: 2002-12-28 12:39

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The solution will be somewhere in the lock APIs. 
(http://docs.sun.com/db/doc/806-6867/6jfpgdcml?a=view)

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Comment By: Markus Elfring (elfring)
Date: 2002-09-21 17:18

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This tool will need some functions in the thread interface to query the dependencies between the running or 
waiting threads.
A helpful function would be to return a list of identifiers for deadlocked threads.
I suggest to offer the function "thread::is_deadlocked id", too.

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