Re: Performance Notes - Locking

I'm curious too.  Since I am rewriting marshalling  from scratch I need
to understand this too.  I'll look specifically tonight and talk about
it tomorrow.

Christophe Warland (FRSGlobal) wrote:

>Getting back to this issue, I'd love to hear someone's explanation around
>this line in jawin-2.0-alpha1/docs/perfdata/Performance1.html :
>
>"Locking. Some parts of the marshalling code use critical sections and
>kernel objects which might be contested especially in a server environment."
>
>In particular, what parts of the marshalling code are we talking about here?
>I'll be happy to try to fix it if only I knew where to start looking.
>
>Thanks.
>
>Regards,
>
>-- Christophe
>
>-----Original Message-----
>From: Christophe Warland (FRSGlobal) [mailto:[email protected]]
>Sent: Thursday, May 12, 2005 2:11 PM
>To: [email protected]
>Subject: Performance Notes - Locking
>
>I believe that I am actually suffering from a locking problem in the
>marshalling layer. I hooked up JAWIN in a client-server environment, with a
>custom pool of thread so as to avoid the apartment 'nightmare', and once in
>every few hundreds calls I get stuck in a locking situation.
>
>The docs on Performance Notes on Java/Win32 integration warned that it could
>happen. And I am now wondering if there is a technical solution or hack to
>the problem. Do any of you have a suggestion for this? Thanks.
>
>Regards,
>
>-- Christophe Warland
>
>PS: for those interested, here is a stacktrace from one on my Worker
>threads. As you can see it is stuck in a native method of the GenericStub:
>
>"Thread-33" daemon prio=5 tid=0x0098f258 nid=0x80 runnable
>[3c2f000..3c2fd8c]
>  at org.jawin.marshal.GenericStub.dispatchInvoke0(Native Method)
>  at org.jawin.marshal.GenericStub.dispatchInvoke(GenericStub.java:201)
>  at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:587)
>  at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:555)
>  at org.jawin.DispatchPtr.invoke(DispatchPtr.java:510)
>  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>  at java.lang.reflect.Method.invoke(Unknown Source)
>  at com.s1.frs.rand.frsweb.broker.Worker.run(Worker.java:54)
>
>
>