mutex in kld

[Anurag Chaudhary]

I am using mutex in my kld.
but every time i run two instances of a program that uses this driver, the 
system hangs.
I hav put the lock function in the open function of kld and unlock in close 
function.
There is no call to sleep.
Although it is a big code to protect, but i need it that way.
Is there some solution to the problem.
Is lockmgr a better idea for this.
this is urgent

thanx
Anurag

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