NAME 
src/classes/coroutine.pmc - Co-Routine PMC
DESCRIPTION
Coroutine extends Continuation to provide a subroutine that can stop in the middle,
and start back up later at the point at which it stopped.
See the Glossary for more information.
Flags
Methods
void init()- Initializes the co-routine.
PMC *clone()- Clone the couroutine.
void *invoke(void *next)- Swaps the "context".
void mark()- Marks the coroutine as live.
HISTORY
Initial version by Melvin on 2002/06/6.
