I had the benefit of cutting my teeth at my first job, working on a message-passing OS. CTOS, based on RMX/86 used messages for everything. It was a very early

I had the benefit of cutting my teeth at my first job, working on a message-passing OS. CTOS, based on RMX/86 used messages for everything. It was a very early networked computing system. Diskless workstations where file messages simply got forwarded to a server etc. And all the messages and queues were visible in the debugger! So I learned good thread hygiene right out of school.