Question

在我们的应用程序中，我们目前正在转移System.Threading.Tasks.Dataflow来管理所有通信。但现在每次我们在任何自定义SynchronizationContext中使用我们的网络客户端/服务器类时，我们都会遇到异常。

“System.Threading.ExecutionContext未实现接口 System.IDisposable的”。

我看不出这是怎么回事。我们永远不会改变或玩任何线程执行上下文。我们最接近它的是

    SynchronizationContext.SetSynchronizationContext (new GtkSynchronizationContext ());
    Scheduler = TaskScheduler.FromCurrentSynchronizationContext ();
    Factory = new TaskFactory (Scheduler);

我不明白为什么自定义SynchronizationContext会使DataFlow像这样崩溃。以下是导致DataFlow异常的应用程序的输出。

madrang@Qosmio-X770:~$ '/home/madrang/WorkSpace/linsft/Source/Invensys/Build/runbuild' 
Engine Initialize started
==============================================================================
Application Information
------------------------------------------------------------------------------
Program      : /home/madrang/WorkSpace/linsft/Source/Invensys/Build/Bin/Linsft.Engine.dll
Time         : 14/04/2013 04:46:02
User         : madrang
Computer     : Qosmio-X770
OS           : Linux64
Processors   : 8
Working Set  : 0
Framework    : 4.0.30319.1
Run Time     : 00:00:01.6015700
------------------------------------------------------------------------------
Loaded Modules
------------------------------------------------------------------------------
/usr/bin/mono||0
/usr/bin/mono||3031040
/usr/lib/mono/gac/Mono.Posix/4.0.0.0__0738eb9f132ed756/Mono.Posix.dll|4.0.0.0|188416
/usr/lib/mono/gac/System.Runtime.Serialization/3.0.0.0__b77a5c561934e089/System.Runtime.Serialization.dll|3.0.0.0|196608
/usr/lib/mono/gac/System.ServiceModel/3.0.0.0__b77a5c561934e089/System.ServiceModel.dll|3.0.0.0|1396736
/usr/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll|4.0.0.0|1748992
/usr/lib/mono/gac/System.Xml/4.0.0.0__b77a5c561934e089/System.Xml.dll|4.0.0.0|1273856
/usr/lib/mono/gac/System.Core/4.0.0.0__b77a5c561934e089/System.Core.dll|4.0.0.0|798720
/home/madrang/WorkSpace/linsft/Source/Invensys/Build/Bin/NLog.dll|2.0.0.0|319488
/home/madrang/WorkSpace/linsft/Source/Invensys/Build/Bin/Mono.Addins.dll|1.0.0.0|237568
/home/madrang/WorkSpace/linsft/Source/Invensys/Build/Bin/Mono.Addins.Setup.dll|1.0.0.0|131072
/lib/x86_64-linux-gnu/libnss_files-2.17.so||49152
/lib/x86_64-linux-gnu/libnss_nis-2.17.so||45056
/lib/x86_64-linux-gnu/libnsl-2.17.so||94208
/lib/x86_64-linux-gnu/libnss_compat-2.17.so||32768
/usr/lib/mono/4.0/mscorlib.dll|4.0.0.0|2867200
/usr/lib/locale/locale-archive||2920448
/lib/x86_64-linux-gnu/libc-2.17.so||1826816
/lib/x86_64-linux-gnu/libpthread-2.17.so||98304
/lib/x86_64-linux-gnu/libdl-2.17.so||12288
/lib/x86_64-linux-gnu/librt-2.17.so||28672
/lib/x86_64-linux-gnu/libm-2.17.so||1060864
/lib/x86_64-linux-gnu/ld-2.17.so||143360
/usr/lib/mono/gac/System.Configuration/4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll|4.0.0.0|126976
/home/madrang/WorkSpace/linsft/Source/Invensys/Build/Bin/Linsft.Engine.dll|0.5.4849.6350|36864
/home/madrang/WorkSpace/linsft/Source/Invensys/Build/Invensys.exe|1.0.4845.22748|8192
/run/shm/mono.8910||4096
------------------------------------------------------------------------------
Loaded Assembly
------------------------------------------------------------------------------
Mono.Posix, 4.0.0.0
System.Runtime.Serialization, 3.0.0.0
System.ServiceModel, 3.0.0.0
System, 4.0.0.0
System.Configuration, 4.0.0.0
System.Xml, 4.0.0.0
System.Core, 4.0.0.0
NLog, 2.0.0.0
Mono.Addins, 1.0.0.0
Mono.Addins.Setup, 1.0.0.0
Linsft.Engine, 0.5.4849.6350
Invensys, 1.0.4845.22748
mscorlib, 4.0.0.0
==============================================================================
Registed new scheduler: ThreadPool
Addin Loaded: Linsft.Engine
Assembly Loaded ICSharpCode.SharpZipLib, 2.84.0.0
Assembly Loaded Mono.Addins.CecilReflector, 1.0.0.0
Assembly Loaded Mono.CSharp, 4.0.0.0
Assembly Loaded NLog.Extended, 2.0.0.0
Assembly Loaded xunit, 1.9.1.1600
Assembly Loaded xunit.extensions, 1.9.1.1600
Assembly Loaded xunit.runner.utility, 1.9.1.1600
Addin Loaded: Linsft.Invensys
Starting new task in default scheduler: Linsft.CommandExtensionNode: Id=Linsft.Core.IdleScheduler.Initialize, Linsft.Core.IdleScheduler.Initialize()
Assembly Loaded Linsft.Core, 1.0.4850.6090
Assembly Loaded Linsft.Configuration, 0.0.0.1
Assembly Loaded Linsft.Network, 0.0.0.1
Assembly Loaded Linsft.Storage, 0.0.0.1
Assembly Loaded Linsft.Validator.Base, 1.0.0.22749
Assembly Loaded System.Threading.Tasks.Dataflow, 0.0.4303.21337
Assembly Loaded Ionic.Zip.Reduced, 1.9.1.8
Assembly Loaded Linsft.Helper, 1.0.4845.22748
Addin Loaded: Linsft.Core
Idle Scheduler Initialize
Idle Scheduler Started
Registed new scheduler: Idle
Starting pending task for: Idle
Scheduler Idle loaded, unlock Initialize
Assembly Loaded Mono.Security, 4.0.0.0
Starting new task in default scheduler: Linsft.CommandExtensionNode: Id=Linsft.Core.Gui.InitializeGtk, Linsft.Core.Gui.GtkScheduler.Initialize()
Addin Loaded: Linsft.Core.Gui
Assembly Loaded atk-sharp, 3.0.0.0
Assembly Loaded cairo-sharp, 1.10.0.0
Assembly Loaded gdk-sharp, 3.0.0.0
Assembly Loaded gio-sharp, 3.0.0.0
Assembly Loaded glib-sharp, 3.0.0.0
Assembly Loaded gtk-dotnet, 3.0.0.0
Assembly Loaded gtk-sharp, 3.0.0.0
Assembly Loaded pango-sharp, 3.0.0.0
Assembly Loaded Linsft.Core.Gui, 1.0.4850.6091
Gtk Scheduler Initialize
Scheduler not loaded, Will be started later: Linsft.CommandExtensionNode: Id=Linsft.Core.Gui.ShowMainWindow, Scheduler=Gtk, Linsft.Core.Gui.MainWindow.ShowWindow()
Gtk Scheduler Started
Starting new task in default scheduler: Linsft.CommandExtensionNode: Id=Linsft.Commander.Initialize, Linsft.Commander.Terminal.Initialize()
Addin Loaded: Linsft.Commander
Assembly Loaded Linsft.Commander, 1.0.4852.8576
Telnet server started: [ServicePoint: Address=tcp://127.0.0.1:8090/, ConnectionName=tcp, ConnectTimeout=15000, Port=8090]
Registed new scheduler: Gtk
Starting pending task for: Gtk
Building ExtendedWindow
Completed Building ExtendedWindow
Building MainWindow
Linsft.Core Opening Configuration Storage
Opening Container, Class=Linsft.Core.Configuration, Method=.cctor
Linsft.Core Configuration Loaded Sucessfully
MainWindow Width=800, Height=600
MainWindow X=65, Y=24
Completed Building MainWindow
Engine Initialize completed
TcpConnectionListener Connection Request: [ServicePoint: Address=tcp://127.0.0.1:8090/, ConnectionName=tcp, ConnectTimeout=15000, Port=8090]
Telnet client connected: [ServicePoint: Address=tcp://127.0.0.1:43544/, ConnectionName=tcp, ConnectTimeout=15000, Port=43544]
TcpConnectionListener received a new connection: [ServicePoint: Address=tcp://127.0.0.1:43544/, ConnectionName=tcp, ConnectTimeout=15000, Port=43544]
System.Threading.ExecutionContext doesn't implement interface System.IDisposable

Stacktrace:

  at System.Threading.Tasks.Dataflow.Internal.Common.CreateCopyAndRun (System.Threading.ExecutionContext,System.Threading.ContextCallback,object) <0x00071>
  at System.Threading.Tasks.Dataflow.Internal.Common.InvokeCallbackWithContext (System.Threading.ExecutionContext,System.Threading.ContextCallback,object) <0x0003b>
  at System.Threading.Tasks.Dataflow.Internal.TargetCore`1.ProcessMessagesLoopWithExecutionContext () <0x0011f>
  at System.Threading.Tasks.Dataflow.Internal.TargetCore`1.<ProcessAsyncIfNecessary_Slow>b__3 (object) <0x00033>
  at System.Threading.Tasks.TaskActionInvoker/ActionObjectInvoke.Invoke (System.Threading.Tasks.Task,object,System.Threading.Tasks.Task) <0x00023>
  at System.Threading.Tasks.Task.InnerInvoke () <0x0005c>
  at System.Threading.Tasks.Task.ThreadStart () <0x001cf>
  at System.Threading.Tasks.Task.Execute () <0x0000f>
  at System.Threading.Tasks.TpScheduler.TaskExecuterCallback (object) <0x0004b>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

    mono() [0x4961e9]
    /lib/x86_64-linux-gnu/libpthread.so.0(+0xfbd0) [0x7fbd34914bd0]
    /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37) [0x7fbd34574037]
    /lib/x86_64-linux-gnu/libc.so.6(abort+0x148) [0x7fbd34577698]
    mono() [0x5cdd7f]
    mono() [0x5cde02]
    mono() [0x497eaf]
    mono() [0x4985c4]
    [0x41751bba]

Debug info from gdb:

Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No threads.

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

/home/madrang/WorkSpace/linsft/Source/Invensys/Build/invensys: line 5:  8910 Aborted                 (core dumped) mono "$INVENSYSDIR/Invensys.exe"

在Mono上运行

madrang@Qosmio-X770:~$ mono --version
Mono JIT compiler version 2.10.8.1 (Debian 2.10.8.1-5ubuntu1)
Copyright (C) 2002-2011 Novell, Inc, Xamarin, Inc and Contributors. www.mono-project.com
    TLS:           __thread
    SIGSEGV:       altstack
    Notifications: epoll
    Architecture:  amd64
    Disabled:      none
    Misc:          softdebug 
    LLVM:          supported, not enabled.
    GC:            Included Boehm (with typed GC and Parallel Mark)

欢迎任何想法，因为我现在开始阅读第二周的文档和代码，试图找到解决方案。

谢谢，Madrang

Answer 1

应该等待....我的一位同事找到了一个非常简单的解决办法。

madrang@Qosmio-X770:~$ /opt/mono-3/bin/mono --version
Mono JIT compiler version 3.0.7 (tarball Sat Mar 30 14:45:04 UTC 2013)
Copyright (C) 2002-2012 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
    TLS:           __thread
    SIGSEGV:       altstack
    Notifications: epoll
    Architecture:  amd64
    Disabled:      none
    Misc:          softdebug 
    LLVM:          supported, not enabled.
    GC:            Included Boehm (with typed GC and Parallel Mark)

现在在mono 3下运行，它运行正常。它接近最新的mono 2版本的错误。

Answer 2

我怀疑是你在某种程度上引用了.NET 4.0之前的ExecutionContext版本。您会注意到在.NET 4.0之前，ExecutionContext没有实现IDisposable：

http://msdn.microsoft.com/en-us/library/system.threading.executioncontext(v=vs.90).aspx

上面显示您使用的是.NET 4.0，但无论如何您可以考虑如何在应用程序中引入旧版ExecutionContext？您是否有机会使用.NET 3.5 backported System.Threading.dll？对于Reactive Extensions？

我不是单声道用户，但Mono的ExecutionContext为.NET 4.0实现IDisposable（其中我检查一下）？看着这个： https://github.com/mono/mono/blob/master/mcs/class/corlib/System.Threading/ExecutionContext.cs

它表明它确实如此，但我不知道您使用的当前版本的单声道是否具有该代码。

System.Threading.ExecutionContext未实现接口System.IDisposable

2 个答案: