Sample threads programs. Both programs provide the same functionality,
a threaded program that reads from stdin (one thread) and writes to
stdout (the other thread).

threadecho is a BAD example - it  uses busy waiting.

threadecho2 is much better - it uses condition signals.

Files:

Makefile:	makefile for building both programs
threadecho.c: source for the bad example
threadecho2.c: the better version, uses condition signals.