write c extension

gistfile1.txt

-gem mongo_kerberos-example

ruby data types (18) ruby core objects
t_nil
t_object
t_class
t_string  -> RString(c data type) <- RSTRING(functions)
t_array   -> RArrray <- RARRAY
t_false
t_symbol

interacting with data types

1- check the type
2- convert VALUE into C data 

How to check the type?
TYPE(VALUE valu)

Check_Type(Value value, int type)

c to ruby
1. cast to VALUE
2. use functions
3. wrap data

3/ encapsulate c data into ruby object
VALUE context;
context = Data?Wrap_Struct(rb_cObject, NULL, sasl_conn_free, conn)-> GarbageCcolector marker (object, gc, when liberate, )
rb_iv_set(self, "@context", context); how ruby code access this data

include ext with your gem
1) extconf.rb is better to have gem dependenci exception
inspect env and generate C makefile
2)rake compile task
task to build the extension(for testing, etc)
3)gemspec
include extension files and specify that the gem has an ext.
4)the c code
void Init_csassl(){
   rb_define_method();
}

extension dependency == gem dependency