[Mono-dev] How to find extern definition for MonoIO void Lock(

[Edward Ned Harvey (mono)]

I am trying to find the definition for this:
mcs/class/corlib/System.IO/MonoIO.cs:                               public extern static void Lock (...)

I'd like to know how the Lock() method is implemented, so I can understand the valid parameters.  (I know the two ints must be >= 0, but I'd like to know what else.  And generally speaking, know how it's implemented so I can know its limitations).
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