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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Filed as
<a href="http://ironpython.codeplex.com/workitem/30551">http://ironpython.codeplex.com/workitem/30551</a>
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Jeff Hardy [mailto:jdhardy@gmail.com]
<br>
<b>Sent:</b> Friday, April 15, 2011 9:41 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Cc:</b> Dino Viehland; surangika ranathunga<br>
<b>Subject:</b> Re: [IronPython] how to generate multiple concurrent scriptign engines?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can one of your alter-egos file a bug so it doesn't get lost?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">- Jeff<o:p></o:p></p>
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<p class="MsoNormal">On Fri, Apr 15, 2011 at 10:36 AM, Dino Viehland <<a href="mailto:dinov@microsoft.com">dinov@microsoft.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">It might come from CopyReg but the bug is definitely in GetEqualSite – we just need a lock(_equalSites) { … } around the TryGetValue
and creation of the equal site.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Jeff Hardy<br>
<b>Sent:</b> Friday, April 15, 2011 7:29 AM<br>
<b>To:</b> surangika ranathunga<br>
<b>Cc:</b> Discussion of IronPython</span><o:p></o:p></p>
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<b>Subject:</b> Re: [IronPython] how to generate multiple concurrent scriptign engines?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Any chance you can share what the source is? The exception comes from PythonCopyReg's initialization, which means we might have a bug (it might not be thread-safe, or something
else). If you could create a minimal sample that has the issue that would be even better.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">- Jeff<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Thu, Apr 14, 2011 at 9:18 PM, surangika ranathunga <<a href="mailto:lady_radsu@yahoo.com" target="_blank">lady_radsu@yahoo.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,<br>
Below is the exception I receive:<br>
here, D:\PhD Work\Research\libomv\test\MonitorService\MonitorService\ExpectationMonitor.cs:line 88 refers to source.Execute(scope); in the below given code.<br>
<br>
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceExce<br>
ption: Object reference not set to an instance of an object.<br>
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)<br>
at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)<br>
at IronPython.Runtime.PythonContext.GetEqualSite(Type type)<br>
at IronPython.Runtime.CommonDictionaryStorage.UpdateHelperFunctions(Type t, Object key)<br>
at IronPython.Runtime.CommonDictionaryStorage.AddNoLock(Object key, Object value)<br>
at IronPython.Runtime.CommonDictionaryStorage.Add(Object key, Object value)<br>
at IronPython.Runtime.PythonDictionary.SetItem(Object key, Object value)<br>
at IronPython.Runtime.PythonDictionary.set_Item(Object key, Object value)<br>
at IronPython.Modules.PythonCopyReg.PerformModuleReload(PythonContext context, PythonDictionary dict)<br>
--- End of inner exception stack trace ---<br>
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)<br>
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)<br>
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)<br>
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)<br>
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)<br>
at IronPython.Runtime.PythonContext.CreateBuiltinModule(String moduleName, Type type, ModuleOptions options)<br>
at IronPython.Runtime.PythonContext.CreateBuiltinModule(String moduleName, Type type)<br>
at IronPython.Runtime.PythonContext.CreateBuiltinModule(String name)<br>
at IronPython.Runtime.PythonContext.GetBuiltinModule(String name)<br>
at IronPython.Runtime.Importer.ImportBuiltin(CodeContext context, String name)<br>
at IronPython.Modules.PythonCopyReg.EnsureModuleInitialized(CodeContext context)<br>
at IronPython.Modules.PythonCopyReg.GetDispatchTable(CodeContext context)<br>
at IronPython.Modules.PythonRegex.PerformModuleReload(PythonContext context,PythonDictionary dict)<br>
--- End of inner exception stack trace ---<br>
at Microsoft.Scripting.Actions.Calls.MethodCandidate.Caller.Call(Object[] args, Boolean& shouldOptimize)<br>
at IronPython.Runtime.Types.BuiltinFunction.BuiltinFunctionCaller`5.Call4(CallSite site, CodeContext context, TFuncType func, T0 arg0, T1 arg1, T2 arg2, T3 arg3)<br>
at System.Dynamic.UpdateDelegates.UpdateAndExecute6[T0,T1,T2,T3,T4,T5,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)<br>
at IronPython.Runtime.Importer.Import(CodeContext context, String fullName, PythonTuple from, Int32 level)<br>
at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext context, String fullName, Int32 level)<br>
at Microsoft.Scripting.Interpreter.FuncCallInstruction`4.Run(InterpretedFrame frame)<br>
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)<br>
at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1)<br>
at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)<br>
at IronPython.Compiler.PythonScriptCode.Run(Scope scope)<br>
at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope)<br>
at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope)<br>
at Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink)<br>
at Microsoft.Scripting.SourceUnit.Execute(Scope scope)<br>
at Microsoft.Scripting.Hosting.ScriptSource.Execute(ScriptScope scope)<br>
at MonitorService.ExpectationMonitor.Initialize(String rule) in D:\PhD Work\Research\libomv\test\MonitorService\MonitorService\ExpectationMonitor.cs:line 88<br>
<br>
--- On <b>Thu, 14/4/11, Jeff Hardy <i><<a href="mailto:jdhardy@gmail.com" target="_blank">jdhardy@gmail.com</a>></i></b> wrote:<o:p></o:p></p>
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From: Jeff Hardy <<a href="mailto:jdhardy@gmail.com" target="_blank">jdhardy@gmail.com</a>><br>
Subject: Re: [IronPython] how to generate multiple concurrent scriptign engines?<br>
To: "Discussion of IronPython" <<a href="mailto:users@lists.ironpython.com" target="_blank">users@lists.ironpython.com</a>><br>
Cc: "surangika ranathunga" <<a href="mailto:lady_radsu@yahoo.com" target="_blank">lady_radsu@yahoo.com</a>><br>
Received: Thursday, 14 April, 2011, 7:35 AM<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">As long as you have a ScriptScope per thread, you should be able to<br>
share the ScriptEngine & Runtime between threads.<br>
<br>
What is the exception that you are getting? If it's a GUI program,<br>
remember that UI elements can only be manipulated from the main<br>
thread.<br>
<br>
- Jeff<br>
<br>
On Thu, Apr 14, 2011 at 1:02 AM, surangika ranathunga<br>
<<a href="http://mc/compose?to=lady_radsu@yahoo.com" target="_blank">lady_radsu@yahoo.com</a>> wrote:<br>
><br>
> Hi,<br>
> I am using Ironpython to connect to a legacy python code from C#.<br>
> I am not fully familiar with Ironpython, but managed to get it working for a single-threaded application.<br>
> This is how I implemented this:<br>
><br>
> ScriptEngine engine = Python.CreateEngine();<br>
> ScriptRuntime runtime = engine.Runtime;<br>
> ScriptScope scope = runtime.CreateScope();<br>
> ops = engine.Operations;<br>
> ScriptSource source = engine.CreateScriptSourceFromFile("ironpython.py");<br>
> source.Execute(scope);<br>
> string class_param = rule;<br>
> object[] parameters = new object[1];<br>
> parameters[0] = class_param;<br>
> object klass = scope.GetVariable("model_checker");<br>
> object instance = ops.Invoke(klass, parameters);<br>
> method = ops.GetMember(instance, "check_model");<br>
><br>
> Now I want to make my application multi-threaded, and I want to have concurrently running scripting engines. Essentially, these engines should access the same underlying python code, and hence these scripting engines are identical to each other.<br>
> Without any change, the above code works fine for most of the time for a multi-threaded application. However, there is an exception that appears from time to time, and I suspect that it is due to a concurrency issue.<br>
><br>
> Is there anything specific that I should do to generate multiple scripting engines running in separate threads without interfering with each other?<br>
><br>
> any ideas greatly appreciated<br>
><br>
> _______________________________________________<br>
> Users mailing list<br>
> <a href="http://mc/compose?to=Users@lists.ironpython.com" target="_blank">Users@lists.ironpython.com</a><br>
> <a href="http://lists.ironpython.com/listinfo.cgi/users-ironpython.com" target="_blank">
http://lists.ironpython.com/listinfo.cgi/users-ironpython.com</a><br>
><o:p></o:p></p>
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