control frame

[Saifi Khan]

Hi:

Can somebody throw light on the 'control frame' concept ?

| bootstraptest.tmp.rb:3: [BUG] rb_thread_create_timer_thread: return non-zero (11)
| ruby 1.9.2dev (2009-02-26 trunk 22651) [i686-linux]
|
| -- control frame ----------
| c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC :fork
| c:0003 p:0048 s:0007 b:0006 l:001014 d:000334 EVAL bootstraptest.tmp.rb:3
| c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
| c:0001 p:0000 s:0002 b:0002 l:001014 d:001014 TOP <main>:17

Is there formal specification for TOP, FINISH, EVAL, CFUNC
etc ?

thanks
Saifi.