Are terminal writes atomic?

[Jim Stratton]

I have two processes doing simultaneous output to the same terminal using the
write system call.  Assume A does a write of 10 bytes while B does a write
of 30 bytes.  Can I be assured that A's and B's output will not be inter-
mixed?  I understand that for pipes, they won't be mixed.  How about terminals?
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Jim Stratton		hplabs.hp.com!hpcupt1!stratton