I am writing a C extension and wish to call a block from within one of
my  extension's methods.

Ruby calling code

    cExtensionInstance.readtoken( 0, 10 ) { puts "hello world" }

In the C function providing the readtoken method, I can have code
like:

    VALUE blockProc;

    if ( rb_block_given_p() )
    {
        blockProc = rb_f_lambda();
        // how do I now call the block pointed to by blockProc?
    }

My question is, what Ruby function do I use from within my C method
function to call blockProc?

Should I be calling rb_yield() or is there a simpler function to call?

Many thanks,

Phil