Threads API

Some simple examples of how to use POSIX thread APIs.

Relevant files:

• thread_create.c: A simple thread creation program, with args passed to the
  thread.
• thread_create_with_return_args.c: Return values from the thread to the
  parent.
• thread_create_simple_args.c: Simpler argument/return value passing for the
  lazy.

Type make to build; each file foo.c generates an executable foo which
you can then run, e.g.:

prompt> ./thread_create