ContextSwitchDe adlock Problem

[Kalpana]

Hi,

As iam working on convertion of C#1.1 to 2.0. Iam facing a problem
(screen is flickered) while opening and closing any artifacts. When i
tried to debug it is througing ContextSwitchDe adlock MDA exception i.e.

The CLR has been unable to transition from COM context 0x1a0768 to COM
context 0x1a08d8 for 60 seconds. The thread that owns the destination
context/apartment is most likely either doing a non pumping wait or
processing a very long running operation without pumping Windows
messages. This situation generally has a negative performance impact and
may even lead to the application becoming non responsive or memory usage
accumulating continually over time. To avoid this problem, all single
threaded apartment (STA) threads should use pumping wait primitives
(such as CoWaitForMultip leHandles) and routinely pump messages during
long running operations.

please suggest...

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[Laura T.]

Could be a false positive because of debugger.
Check if this applies:
http://blogs.msdn.com/jmstall/archiv...hDeadLock.aspx

"Kalpana" <ka*****@devdex .comha scritto nel messaggio
news:eS******** ******@TK2MSFTN GP04.phx.gbl...

>

Hi,

As iam working on convertion of C#1.1 to 2.0. Iam facing a problem
(screen is flickered) while opening and closing any artifacts. When i
tried to debug it is througing ContextSwitchDe adlock MDA exception i.e.

The CLR has been unable to transition from COM context 0x1a0768 to COM
context 0x1a08d8 for 60 seconds. The thread that owns the destination
context/apartment is most likely either doing a non pumping wait or
processing a very long running operation without pumping Windows
messages. This situation generally has a negative performance impact and
may even lead to the application becoming non responsive or memory usage
accumulating continually over time. To avoid this problem, all single
threaded apartment (STA) threads should use pumping wait primitives
(such as CoWaitForMultip leHandles) and routinely pump messages during
long running operations.

please suggest...

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[Kalpana]

It is not working.
Is there is any chance of having this problem due to the handles invoked
from WndProc()?

Previoulsy i had a problem with Utilitylibrary. Rebar --WndProc()
recursive call (deadlock). I posted this problem but no one reply --so
for the temporary survive i kept a condition for termination (to avoid
deadlock). condition is:
if (m.Msg == (int)Msg.WM_WIN DOWPOSCHANGED)
return;
if condition reaches then control will be returned from WndProc().

Is this present problem of flickering (when we don't debug) and
ContextSwitchDe adLock exception --(when we debug -- see the exception
below) is due to WndProc() condition??
However please suggest

EXCEPTION DESCRIPTION:
The CLR has been unable to transition from COM context 0x1a0768 to COM
context 0x1a08d8 for 60 seconds. The thread that owns the destination
context/apartment is most likely either doing a non pumping wait or
processing a very long running operation without pumping Windows
messages. This situation generally has a negative performance impact and
may even lead to the application becoming non responsive or memory usage
accumulating continually over time. To avoid this problem, all single
threaded apartment (STA) threads should use pumping wait primitives
(such as CoWaitForMultip leHandles) and routinely pump messages during
long running operations.

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[Laura T.]

WndProc should be considered as non re-entrant (and this not recursive).
If you must send messages to other controls owned by you, use PostMessage
(non blocking), not SendMessage (blocking).

"Kalpana" <ka*****@devdex .comha scritto nel messaggio
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

>
It is not working.
Is there is any chance of having this problem due to the handles invoked
from WndProc()?

Previoulsy i had a problem with Utilitylibrary. Rebar --WndProc()
recursive call (deadlock). I posted this problem but no one reply --so
for the temporary survive i kept a condition for termination (to avoid
deadlock). condition is:
if (m.Msg == (int)Msg.WM_WIN DOWPOSCHANGED)
return;
if condition reaches then control will be returned from WndProc().

Is this present problem of flickering (when we don't debug) and
ContextSwitchDe adLock exception --(when we debug -- see the exception
below) is due to WndProc() condition??
However please suggest

EXCEPTION DESCRIPTION:
The CLR has been unable to transition from COM context 0x1a0768 to COM
context 0x1a08d8 for 60 seconds. The thread that owns the destination
context/apartment is most likely either doing a non pumping wait or
processing a very long running operation without pumping Windows
messages. This situation generally has a negative performance impact and
may even lead to the application becoming non responsive or memory usage
accumulating continually over time. To avoid this problem, all single
threaded apartment (STA) threads should use pumping wait primitives
(such as CoWaitForMultip leHandles) and routinely pump messages during
long running operations.

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[Willy Denoyette [MVP]]

"Kalpana" <ka*****@devdex .comwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

>
It is not working.
Is there is any chance of having this problem due to the handles invoked
from WndProc()?

Previoulsy i had a problem with Utilitylibrary. Rebar --WndProc()
recursive call (deadlock). I posted this problem but no one reply --so
for the temporary survive i kept a condition for termination (to avoid
deadlock). condition is:
if (m.Msg == (int)Msg.WM_WIN DOWPOSCHANGED)
return;
if condition reaches then control will be returned from WndProc().

We realy can't help you if you are only posting some lines of code, what else are you doing
after this..
if (m.Msg == (int)Msg.WM_WIN DOWPOSCHANGED)
return;
..... // ????

Willy.

[Kalpana Naraboina]

protected override void WndProc(ref Message m) {
if (m.Msg == (int)Msg.WM_WIN DOWPOSCHANGED)
return;
base.WndProc(re f m);

switch (m.Msg)
{
case (int)Msg.WM_PAI NT:
PaintBackground ();
break;
case (int)Msg.WM_NOT IFY:
case (int)((int)Msg. WM_NOTIFY + (int)Msg.WM_REF LECT):
{
NMHDR note = (NMHDR)m.GetLPa ram(typeof(NMHD R));
switch (note.code)
{
case
(int)RebarNotif ications.RBN_HE IGHTCHANGE:
UpdateSize();
break;

case
(int)RebarNotif ications.RBN_CH EVRONPUSHED:
NotifyChevronPu shed(ref m);
break;

case (int)RebarNotif ications.RBN_CH ILDSIZE:
NotifyChildSize ();
break;
case (int)Notificati onMessages.NM_N CHITTEST:
break;
}
}
break;
}
}

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[Kalpana Naraboina]

Hi,

I used PostMessage() instead SenMessage() this avoided blocking i.e.
infinite loop but giving unhandled Exception:

AccessViolation Exception: Attempted to read or write protected memory.
This is often an indication that other memory is corrupt

I searched the cause of this exception but that solutions are not
helping the need (like debugger setting from tools --options)

My application Rebar --toolbar is not visible and Navigations are not
working fine :(

NOTE: POSTMESSAGE() is used only for user coded wndproc() methods still
SENDMESSAGE()ex ists.

IMPORTANT NOTE is all these problems are due to the Utility Library
Rebar --WndProc() handles issue. if we use the new toolstrip from VS
2005 these problems doesnot exists.

There is a necessity with Utility library Rebar --WndProc() --i want
to solve this issue

Please suggest...

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[Laura T.]

Can you get the stack trace of the exception?

"Kalpana Naraboina" <ka************ ***@semanticspa ce.comha scritto nel
messaggio news:ej******** ******@TK2MSFTN GP04.phx.gbl...

>
Hi,

I used PostMessage() instead SenMessage() this avoided blocking i.e.
infinite loop but giving unhandled Exception:

AccessViolation Exception: Attempted to read or write protected memory.
This is often an indication that other memory is corrupt

I searched the cause of this exception but that solutions are not
helping the need (like debugger setting from tools --options)

My application Rebar --toolbar is not visible and Navigations are not
working fine :(

NOTE: POSTMESSAGE() is used only for user coded wndproc() methods still
SENDMESSAGE()ex ists.

IMPORTANT NOTE is all these problems are due to the Utility Library
Rebar --WndProc() handles issue. if we use the new toolstrip from VS
2005 these problems doesnot exists.

There is a necessity with Utility library Rebar --WndProc() --i want
to solve this issue

Please suggest...

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