Thanks for your reply Brian - I have been playing around with this a
fair bit. I checked out the source code from Subversion; the revision
from 2nd June built with no problems and so I now have a .NET 2 build
which appears to work well from the console etc.
Using this from my C# web service exhibits the same behaviour as before
however! The problem is really quite tricky because in fact it is wider
than I previously suspected: the web service will successfully acquire
the lock once or twice in a row, but will then hang at the AcquireLock
call regardless of whether a Python exception had been raised in code or
not.
I don't think any of the C# code would have been called again (and I
kept tabs on calls to acquire and drop the lock), nor is there any
re-entrant code.
This prompted me to change my approach to a rather more satisfactory one
anyway: I use ZSI to create a separate web service from python directly
and call that web service from my C# app. I use PythonNet because I want
to use business code available in .NET assemblies. Thanks to PythonNet
it's been a breeze to use Python in what is otherwise a very C#
environment - I'm really pleased.
Even though I've changed tack, when I have time I'll get a debugger onto
the PythonNet code and try and trace this further - I'll post back if I
get anywhere. It would be interesting to know if it's something peculiar
to me!
For your information, as requested, the code where the problem occurred
is as follows (it's all a touch noddy - various permutations of this
were tried, so that's why the gs lock object rather bizarrely ended up
static etc...):
public class Reporting
{
private static IntPtr gs;
public static void GenerateReport(String report)
{
if (!PythonEngine.IsInitialized)
{
PythonEngine.Initialize();
gs = PythonEngine.AcquireLock();
try
{
PythonEngine.RunSimpleString("import sys");
PythonEngine.RunSimpleString("sys.path.append('g:/pyccolo')");
PythonEngine.RunSimpleString("from report.server_init import *");
PythonEngine.RunSimpleString("print(sys.path)");
PythonEngine.RunSimpleString("o.flush()");
}
finally
{
PythonEngine.ReleaseLock(gs);
}
}
gs = PythonEngine.AcquireLock();
try
{
PythonEngine.RunSimpleString("runReport('"+report+"')");
PythonEngine.RunSimpleString("o.flush()");
}
finally
{
PythonEngine.ReleaseLock(gs);
}
}
}
Regards
Matthew
-----Original Message-----
From: Brian Lloyd [mailto:[EMAIL PROTECTED]
Sent: 06 June 2006 14:24
To: Matthew Pontefract; pythondotnet@python.org
Subject: RE: [Python.NET] .NET 2 and hang with AcquireLock
Hi Matthew -
This is a tough kind of problem to debug through email ;)
Is there any chance that the exceptions you raise cause any
of your C# to be called again?
If not, if there is any way you can distill your code to a
relatively small example that demonstrates the problem, send
it to me and I'll take a look.
-Brian
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Matthew
> Pontefract
> Sent: Tuesday, June 06, 2006 6:08 AM
> To: pythondotnet@python.org
> Subject: [Python.NET] .NET 2 and hang with AcquireLock
>
>
>
> Hello
>
>
> I have a question pertaining to running Python NET under .NET
> version 2 which, admittedly, is not the version for which the
> packages are built.
>
>
>
> All works just fine - I am using the PythonEngine inside a
> web service, acquiring the GIL before operations, releasing
> it in a 'finally' block afterwards. This is fine provided no
> python exceptions are raised in the Python code. Even though
> the GIL is released in the C#, a subsequent call to
> AcquireLock will hang as if waiting for it to be released. No
> calls to acquirelock have been made between the last call to
> release the GIL and the call that hangs.
>
>
> Has anyone else had this problem?
>
>
>
> I am using Python 2.4
>
>
>
> Regards
>
> Matthew
>
>
>
> Dr Matthew Pontefract
>
> Credaris Portfolio Management
>
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