What's a process?
What's a thread?
processes, lightweight processes, and threads
compare
FORK(), JOIN(), QUIT()
with
fork(), wait(), exit()
p54: Even Version 2.0 of Linux used classic processes.
p55: Unlike classic UNIX processes (but very much like threads), the
process created with the FORK() command executes the same copy of a
program and information that is used by the "parent" process (the
process that created the new one).
Discussion of how Copy On Write makes Linux fork() very fast.