Add course signal code.
-rw-r--r-- 32 .cquery
-rw-r--r-- 360 .gitignore
drwxr-xr-x - TD3
drwxr-xr-x - philosophe
drwxr-xr-x - prodcons
drwxr-xr-x - rw
drwxr-xr-x - signal
drwxr-xr-x - threads
drwxr-xr-x - upipe