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List:       orocos-dev
Subject:    [Orocos-Dev] [Bug 1016] New: Add a setName function for tasks.
From:       paul.chavent () fnac ! net (Chavent Paul)
Date:       2013-01-11 10:33:21
Message-ID: bug-1016-4 () http ! bugs ! orocos ! org/
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http://bugs.orocos.org/show_bug.cgi?id=1016

           Summary: Add a setName function for tasks.
           Product: Toolchain
           Version: master
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: RTT
        AssignedTo: orocos-dev at lists.mech.kuleuven.be
        ReportedBy: paul.chavent at fnac.net
                CC: orocos-dev at lists.mech.kuleuven.be
   Estimated Hours: 0.0


Created attachment 843
  --> http://bugs.orocos.org/attachment.cgi?id=843
add the setName method

Hi.

It seems that with the recent addition of get/set Pid/Tid, the sources prepares
to host some new tracing/monitoring code.

I would like to submit a draft of patches that add a setName function to tasks.

 - 0003-Thread-add-setName-method.patch add the setName method.
 - 0004-Thread-fosi_internal-clean-free-of-names-and-zeroing.patch fix a
potential memory leak in rtt/os/xenomai/fosi_internal.cpp that do not free
mytask->name
 - 0005-Thread-add-prctl-commented.patch suggest to use prctl(PR_SET_NAME, ...)
to set the tid name (it can be useful to have a comprehensive output of pstree
for instance, and some tracing tools automatically use this name).

The last patch is a draft and subject to debate. I would like to ask you :
 - do you think it could be possible to append to the task name the runnable
objects that it run ? Indeed, several TaskContexts can be run by the same os
task... so, it's hard to see where is our TaskContext at the first sight...
 - do you think that we could add an option to exactly map one TaskContext to
one thread ? Do you know the performance penalty (far more context switching i
assume) ?
 - is there someone that know equivalent calls of PR_SET_NAME on ither
platforms, and if it exists some calls that can take a pid id as argument ?


Thank for your reading.

Cheers.

Paul.

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