Filed as http://ironpython.codeplex.com/workitem/30551
From: Jeff Hardy [mailto:jdha...@gmail.com] Sent: Friday, April 15, 2011 9:41 AM To: Discussion of IronPython Cc: Dino Viehland; surangika ranathunga Subject: Re: [IronPython] how to generate multiple concurrent scriptign engines? Can one of your alter-egos file a bug so it doesn't get lost? - Jeff On Fri, Apr 15, 2011 at 10:36 AM, Dino Viehland <di...@microsoft.com<mailto:di...@microsoft.com>> wrote: 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. From: users-boun...@lists.ironpython.com<mailto:users-boun...@lists.ironpython.com> [mailto:users-boun...@lists.ironpython.com<mailto:users-boun...@lists.ironpython.com>] On Behalf Of Jeff Hardy Sent: Friday, April 15, 2011 7:29 AM To: surangika ranathunga Cc: Discussion of IronPython Subject: Re: [IronPython] how to generate multiple concurrent scriptign engines? 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. - Jeff On Thu, Apr 14, 2011 at 9:18 PM, surangika ranathunga <lady_ra...@yahoo.com<mailto:lady_ra...@yahoo.com>> wrote: Hi, Below is the exception I receive: here, D:\PhD Work\Research\libomv\test\MonitorService\MonitorService\ExpectationMonitor.cs:line 88 refers to source.Execute(scope); in the below given code. 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 ption: Object reference not set to an instance of an object. at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value) at IronPython.Runtime.PythonContext.GetEqualSite(Type type) at IronPython.Runtime.CommonDictionaryStorage.UpdateHelperFunctions(Type t, Object key) at IronPython.Runtime.CommonDictionaryStorage.AddNoLock(Object key, Object value) at IronPython.Runtime.CommonDictionaryStorage.Add(Object key, Object value) at IronPython.Runtime.PythonDictionary.SetItem(Object key, Object value) at IronPython.Runtime.PythonDictionary.set_Item(Object key, Object value) at IronPython.Modules.PythonCopyReg.PerformModuleReload(PythonContext context, PythonDictionary dict) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at IronPython.Runtime.PythonContext.CreateBuiltinModule(String moduleName, Type type, ModuleOptions options) at IronPython.Runtime.PythonContext.CreateBuiltinModule(String moduleName, Type type) at IronPython.Runtime.PythonContext.CreateBuiltinModule(String name) at IronPython.Runtime.PythonContext.GetBuiltinModule(String name) at IronPython.Runtime.Importer.ImportBuiltin(CodeContext context, String name) at IronPython.Modules.PythonCopyReg.EnsureModuleInitialized(CodeContext context) at IronPython.Modules.PythonCopyReg.GetDispatchTable(CodeContext context) at IronPython.Modules.PythonRegex.PerformModuleReload(PythonContext context,PythonDictionary dict) --- End of inner exception stack trace --- at Microsoft.Scripting.Actions.Calls.MethodCandidate.Caller.Call(Object[] args, Boolean& shouldOptimize) at IronPython.Runtime.Types.BuiltinFunction.BuiltinFunctionCaller`5.Call4(CallSite site, CodeContext context, TFuncType func, T0 arg0, T1 arg1, T2 arg2, T3 arg3) 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) at IronPython.Runtime.Importer.Import(CodeContext context, String fullName, PythonTuple from, Int32 level) at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext context, String fullName, Int32 level) at Microsoft.Scripting.Interpreter.FuncCallInstruction`4.Run(InterpretedFrame frame) at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame) at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1) at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx) at IronPython.Compiler.PythonScriptCode.Run(Scope scope) at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope) at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope) at Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink) at Microsoft.Scripting.SourceUnit.Execute(Scope scope) at Microsoft.Scripting.Hosting.ScriptSource.Execute(ScriptScope scope) at MonitorService.ExpectationMonitor.Initialize(String rule) in D:\PhD Work\Research\libomv\test\MonitorService\MonitorService\ExpectationMonitor.cs:line 88 --- On Thu, 14/4/11, Jeff Hardy <jdha...@gmail.com<mailto:jdha...@gmail.com>> wrote: From: Jeff Hardy <jdha...@gmail.com<mailto:jdha...@gmail.com>> Subject: Re: [IronPython] how to generate multiple concurrent scriptign engines? To: "Discussion of IronPython" <users@lists.ironpython.com<mailto:users@lists.ironpython.com>> Cc: "surangika ranathunga" <lady_ra...@yahoo.com<mailto:lady_ra...@yahoo.com>> Received: Thursday, 14 April, 2011, 7:35 AM As long as you have a ScriptScope per thread, you should be able to share the ScriptEngine & Runtime between threads. What is the exception that you are getting? If it's a GUI program, remember that UI elements can only be manipulated from the main thread. - Jeff On Thu, Apr 14, 2011 at 1:02 AM, surangika ranathunga <lady_ra...@yahoo.com<http://mc/compose?to=lady_ra...@yahoo.com>> wrote: > > Hi, > I am using Ironpython to connect to a legacy python code from C#. > I am not fully familiar with Ironpython, but managed to get it working for a > single-threaded application. > This is how I implemented this: > > ScriptEngine engine = Python.CreateEngine(); > ScriptRuntime runtime = engine.Runtime; > ScriptScope scope = runtime.CreateScope(); > ops = engine.Operations; > ScriptSource source = > engine.CreateScriptSourceFromFile("ironpython.py"); > source.Execute(scope); > string class_param = rule; > object[] parameters = new object[1]; > parameters[0] = class_param; > object klass = scope.GetVariable("model_checker"); > object instance = ops.Invoke(klass, parameters); > method = ops.GetMember(instance, "check_model"); > > 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. > 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. > > Is there anything specific that I should do to generate multiple scripting > engines running in separate threads without interfering with each other? > > any ideas greatly appreciated > > _______________________________________________ > Users mailing list > Users@lists.ironpython.com<http://mc/compose?to=Users@lists.ironpython.com> > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com > _______________________________________________ Users mailing list Users@lists.ironpython.com<mailto:Users@lists.ironpython.com> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
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