# File dl/lib/dl/func.rb, line 172
def bind_at_call(&block)
userdata = @carrier[-1]
userdata[0].push(block)
bind{|*args|
ptr = args[@index]
if( !ptr )
raise(RuntimeError, "The index of userdata should be lower than #{args.size}.")
end
userdata = dlunwrap(Integer(ptr))
args[@index] = userdata[1]
userdata[0][0].call(*args)
}
@mutex.unlock()
end