[ros-dev] Mayday ... Critical Section problems

[Christian Wallukat]

Hi all,


I have a problem with CriticalSection / InterlockIncrement / Decrement on
WinXP (sorry for bother but maybe it is also important for us):

In my program I work with around 200 threads which access a list of objects
(pointer). Between the Enter and Leave the Threads delete or add an object.

Sometimes it take more than 5 seconds to enter the critical section (every
thread need for the operation around 5 ms (5 * 200 = 1000 ms -> 1 second)) I
also see that the Enter has taken 10 seconds ...

There is no load on that system (around 10 %).

After playing around with InterlockIncrement and ILDec I have implemented 
it in asm:

int MyLockInc(volatile long *lCount)
{
	//variables
	///////////
	int nRes = 0;

	__asm
	{
		mov ecx, lCount;
		mov eax, 1;
		lock xadd [ECX], EAX;
		inc EAX;
        	mov nRes, EAX;
	};

	return nRes;
};


int MyLockDec(volatile long *lCount)
{
	//variables
	///////////
	int nRes = 0;

	__asm
	{
		mov ecx, lCount;
	 	mov eax, -1;
		lock xadd [ECX], EAX;
		dec eax;
		mov nRes, EAX;
	};

	return nRes;
};


But it is the same !!!!
What can I do ?

My problem is, that if I need more than 3 seconds for
This operation (which should be more than enough) the 
Operation will be done again (by an external tool) 
which creates ++ new Requests for each one which has 
failed (not just in time)...

You can imagine what will happen after 10 failed requests...
I cant change the behaviour of the other program ...

Please help I play around on this stupid problem since 
5 month ...


Kind regards 


Christian