[reSIProcate] Weird problem with Mutex

[Matthias Moetje - TERASENS GmbH]

Could perhaps anyone using Visual Studio 8.0 (or maybe 7.1) be so kind
to paste these few lines of code into basicRegister to see if this problem
can be reproduced if compiled in release config?
Thanks,

Matthias 


________________________________

	From: resiprocate-devel-bounces at list.sipfoundry.org [mailto:resiprocate-devel-bounces at list.sipfoundry.org] On Behalf Of Matthias Moetje - TERASENS GmbH
	Sent: Friday, June 16, 2006 11:22 PM
	To: resiprocate-devel at list.sipfoundry.org
	Subject: [reSIProcate] Weird problem with Mutex
	
	
	Hi,
	 
	I was finally able to find a minimal piece of code to reproduce 
	an issue I am fighting against during the last days. To reproduce
	you just need to paste the following code to the start of the 
	main() function in basicRegister for example:
	 
	
________________________________

	#include "resip/dum/UserAuthInfo.hxx"
	
________________________________

	resip::SipStack* mStack;
	resip::DialogUsageManager* mDum;

	mStack = new resip::SipStack();
	mDum = new resip::DialogUsageManager(*mStack);

	mDum->addTransport(UDP,5060);
	mDum->addTransport(TCP,5060);

	UserAuthInfo* msg = new UserAuthInfo("asd","asd","asd","asd");
	mDum->post(msg); 
________________________________


	

	Now, the following happens during mDum->post:

	in TransactionUser::post(Message* msg), mFifo.add is called.

	then in TimeLimitFifo<Msg>::add it constructs the lock object:

	Lock::Lock(Lockable & lockable, LockType lockType)

	in this constructor, I get an access violation when it tries to 
	call myLockable.lock();

	When I examine the myLockable I can see that the virtual function
	pointers seem corrupted:

	 

	Usually (that means, when post is called from the dum or stack 
	thread in my application) in the vfptr[] array I can see valid pointers,
	but in this case they are wrong.

	The mID (Windows Critical Section structure) member of the
	Mutex (which inherits from Lockable) seems to remain OK, 
	just the vfptr to the base methods  is wrong.

	I don't really have an idea why this is happening and I feel like 
	banging my head gainst the wall. In my application everything works
	fine. If I put a breakpoint in one of these functions during normal
	operation (inbound, outbound calls, client registration etc.), the
	lockable is always OK, but as soon as I call mDum->post 
	manually, the lockable seems to be damaged and I get an access
	violation exception.

	If I compile the application in debug mode, the problem does not exist!

	I am using VS 2005. Here are the relevant configuration settings I 
	am using for basicRegister:

	Optimization: Disabled
	Inline Function Expansion: Default
	Favor Size or Speed: Neither
	Omit Frame Pointers: No
	Enable String Pooling: No
	Runtime Library: Multi-threaded DLL
	Buffer security check: Yes

	Linker:

	Generate Debug Info: Yes
	References: Default
	Enable COMDAT Folding: Default
	Link time Code Generation: Use Link Time CG
	

	I would be very thankful for any comments as I am running out of
	ideas on this subject (apart from implementing a simple critical 
	section directly without the lockable and mutex objects).

	Thanks and best regards,

	Matthias Moetje

 	
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