Re: Java CA context cleanup issues on Linux?

["J. Lewis Muir" <jlmuir@anl.gov>]

On 12/4/07 2:56 PM, Kay-Uwe Kasemir wrote:
> Hi:
>
> The code below uses JCA to do a simple
> context setup, PV connection, cleanup.
> Then the same again.
>
> On Linux, that second time around results in
> "pthread_create error Invalid argument"
> errors in the createChannel() call.
>
> On OS X it works OK.
> The same code also works OK when using CAJ
> instead of the JNI version of the ChannelAccess
> client lib.
> Haven't tried Windows.
>
> Any ideas?
>
> Thanks,
> -Kay

Hi, Kay.

Your example works for me with the PVs hosted on a VME IOC and the 
following Linux workstation setup:

* Dual Intel Xeon 2.8 GHz w/ hyper-threading enabled
* Red Hat Enterprise Linux WS release 3 (Taroon Update 9)
* EPICS 3.14.8.2
* JCA 2.3.1
* Sun's jdk1.5.0_12

What is your setup?

What happens if you change JNI_THREAD_SAFE to JNI_SINGLE_THREADED?

-lewis

> import gov.aps.jca.Channel;
> import gov.aps.jca.Context;
> import gov.aps.jca.JCALibrary;
>
> /** Test JCA context setup and cleanup. */
> public class JCAContextTest
> {   
>     /** Test run: Setup, connect, cleanup */
>     private void run(final String pv_name) throws Exception
>     {
>         final JCALibrary jca = JCALibrary.getInstance();
>         // Select JCA
>         final Context context = 
> jca.createContext(JCALibrary.JNI_THREAD_SAFE);
>
>         final Channel pv = context.createChannel(pv_name);
>         context.pendIO(5.0);
>         pv.dispose();
>
>         context.dispose();
>     }
>     
>     public static void main(final String[] args) throws Exception
>     {
>         // First test runs OK
>         final JCAContextTest test = new JCAContextTest();
>         test.run("ramp1");
>        
>         // Second time, different PV or not, results in
>         // ""
>         //   pthread_create error Invalid argument
>         //   CAC: Unexpected exception during virtual circuit creation
>         // ""
>         // on Linux.
>         // On OS X, it's fine.
>         System.out.println("Trying again:");
>         test.run("ramp2");
>     }
> }