NAME 
src/inter_cb.c - Parrot Interpreter - Callback Function Handling
DESCRIPTION
NCI callback functions may run whenever the C code executes the callback. To be prepared for asynchronous callbacks these are converted to callback events.
Often callbacks should run synchronously. This can only happen when the C-library calls the callback, because Parrot called a function in the C-library.
Functions
PMC *Parrot_make_cb- Create a callback function according to pdd16.
static void verify_CD- Verify user_data PMC then continue with callback_CD
static void callback_CD- Common callback function handler. See pdd16.
void Parrot_run_callback- Run a callback function. The PMC* user_data holds all necessary items in its properties.
void Parrot_callback_Cvoid Parrot_callback_D- NCI callback functions. See pdd16.
