[Coco] Semaphores in OS-9/6809?

[alsplace at pobox.com]

I recall the StG Net BBS has a quircky multi-user chat program that 
seems to sleep/poll to sync chat between multiple users.  It wasn't 
until years later, using OS-9 (68K, X86, etc.) at Microware that I 
learned about events and semaphores.

Does OS-9/6809 have any type of semaphore/locking mechanism?

     -- Allen