portable way to do nap()

[Erik Murrey]

How can I do a portable nap()?  A nap() (under XENIX) allows
a user process to block for a short time, usually a few hundred ms.

In any case, SysVr2 doesn't support a nap()-like call which is
very useful for two reasons (that I can think of):

1.
	Communications protocols implemented at the user process
	level (e.g. uucico, etc.)
2.
	Character input routines that must distinguish between
	ESC and a function key.

I hear that some systems have a special device for nap()-ing, and
others use select(), and still others are stuck with using a
CPU intensive while() loop using the times() call.

Does SysVr3 address this?  How about SysVr4?

If this has already been hammered to death, then please e-mail
me a summary.

Thanks!
Erik Murrey
-- 
Erik Murrey                            /|   //  /~~~~/  |  /
MPX Data Systems, Inc.                / | / /  /____/   |/
erik at mpx1.UUCP                       /  /  /  /        /|  Data Systems, Inc. 
{spl1,vu-vlsi,bpa}!mpx1!erik        /     /  /       /  |====================