Exec Hangs in Multi-Threaded Parallel

["Murray, Mike" <mb...@ptc.com>]

Can anyone tell me why the exec task, whether or not spawned, hangs in
parallel calls?  It works fine if I pass -DthreadCount=1.  It appears
the higher the threadCount used, the quicker it will hang, since
-DthreadCount=2 works for a while, but threadCount=5 hangs immediately.
This apparently happens when two exec tasks are called simultaneously.
Using a forked java task in similar fashion, hangs the same way.  The
parallel calls of BuildModule work fine when the macrodef uses the ant
task.
 
Thanks, Mike
 
    <parallel threadCount='${threadCount}'>
      <BuildModule name='wnc/Cadx' modroot='CadxHtmlUi/Cadx'
assembly='wnc' />
      <BuildModule name='wnc/Esi' modroot='wcEsi/Esi' assembly='wnc' />
      <BuildModule name='wnc/Explorer'
modroot='Windchill/DevModules/Explorer' assembly='wnc' />
    </parallel>
 
   <macrodef name="BuildModule">
      <attribute name="assembly"             default=""/>
      <attribute name="name"                 default="@{assembly}"/>
      <attribute name="modroot"/>
      <sequential>   
         <exec executable="ant" spawn="true" vmlauncher="false">
            <arg line="-f ${module_script} ${ant.arguments}
-Dmodroot=${viewroot}/@{modroot <mailto:-Dmodroot=${viewroot}/@{modroot>
} -Dcontext=@{assembly}"/ <mailto:-Dcontext=@{assembly}"/> >
         </exec>

Re: Exec Hangs in Multi-Threaded Parallel

[Steve Loughran <st...@apache.org>]

Murray, Mike wrote:
> Can anyone tell me why the exec task, whether or not spawned, hangs in
> parallel calls?  It works fine if I pass -DthreadCount=1.  It appears
> the higher the threadCount used, the quicker it will hang, since
> -DthreadCount=2 works for a while, but threadCount=5 hangs immediately.
> This apparently happens when two exec tasks are called simultaneously.
> Using a forked java task in similar fashion, hangs the same way.  The
> parallel calls of BuildModule work fine when the macrodef uses the ant
> task.

I've not seen this. I wonder if its some kind of race condition/deadlock 
in exec or parallel


>  
> Thanks, Mike
>  
>     <parallel threadCount='${threadCount}'>
>       <BuildModule name='wnc/Cadx' modroot='CadxHtmlUi/Cadx'
> assembly='wnc' />
>       <BuildModule name='wnc/Esi' modroot='wcEsi/Esi' assembly='wnc' />
>       <BuildModule name='wnc/Explorer'
> modroot='Windchill/DevModules/Explorer' assembly='wnc' />
>     </parallel>
>  
>    <macrodef name="BuildModule">
>       <attribute name="assembly"             default=""/>
>       <attribute name="name"                 default="@{assembly}"/>
>       <attribute name="modroot"/>
>       <sequential>   
>          <exec executable="ant" spawn="true" vmlauncher="false">
>             <arg line="-f ${module_script} ${ant.arguments}
> -Dmodroot=${viewroot}/@{modroot <mailto:-Dmodroot=${viewroot}/@{modroot>
> } -Dcontext=@{assembly}"/ <mailto:-Dcontext=@{assembly}"/> >
>          </exec>
> 
> 
> 


-- 
Steve Loughran                  http://www.1060.org/blogxter/publish/5
Author: Ant in Action           http://antbook.org/

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