libpcl1 - 1.12-2 main

Coroutines are a very simple cooperative multitasking environment where
the switch from one task to another is done explicitly by a function
call. Coroutines are a lot faster than processes or threads switch,
since there is no OS kernel involvement for the operation. Also
coroutines require much less OS resources than processes of threads.
.
For a more complete definition of the term coroutine see The Art of
Computer Programming by Donald E. Knuth.