Common Traps for C extensions

Hi, I am writing a toy library in C++ and currently, I am writing a Ruby
extensions for it.

I have one C++ layer to catch all the C++ exceptions, convert them into
error codes wich casts the void Pointers it gets from C to the
appropriate classes etc. Then I have one C layer which handles the Ruby
datatypes and raises the correct exceptions.

But now I am thinking of possible traps I might run into. For example,
the Ruby interpreter forces me to differentiate between allocation and
initialization and in my current implementation, the User could redefine
the initialize() method of my class and then call another method, which
results in undefined behaviour or possibly segfault. I can easily solve
that problem (e.g. by setting some internal flag) but there are probably
a thousand other typical traps like that, where the dynamicity of Ruby
messes with my C memory management. Do you know any important others?

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