Thanks for the info. Looking at this, an idea came to mind that might be worth looking into:
Is GenerateReport() called on a per-request basis as a web service? If so, you might try initializing the python engine once at startup rather than per-request. I'm actually not sure that reinitializing the engine in the same process will work in any reliable way (there are allegations on the python lists that this is a grey area in regard to the C python runtime). If nothing else, it could be causing two instances of Reporting to try to initialize the engine at the same time. Since they are both essentially initializing a single C runtime, I could imagine the GIL getting balled up in that case pretty easily. -Brian > -----Original Message----- > From: Matthew Pontefract [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 06, 2006 11:37 AM > To: Brian Lloyd; pythondotnet@python.org > Subject: RE: [Python.NET] .NET 2 and hang with AcquireLock > > 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 > > > > ________________________________________ > > > > > > > > [EMAIL PROTECTED] > > > > T : (44) 207 925 8365 > > > > F : (44) 207 925 8399 > > > > > > > > CPM Advisers Limited > > > > Norfolk House > > > > 30 Charles II Street > > > > London > > > > SW1Y 4AE > > > > www.credaris.com > > > > > > > > Regulated by the Financial Services Authority > > > > > > > > > > > http://www.credaris.com/disclaimer.php > > > _________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
