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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.wizards
Subject: Re: usleep under Vax/Ultrix
Message-ID: <6925@auspex.auspex.com>
Date: 30 Mar 91 23:59:45 GMT
References: <2171@estevax.UUCP> <126500@uunet.UU.NET>
Organization: Auspex Systems, Santa Clara
Lines: 12

>You can also use select with a subsecond sleep.
>
>I don't think System V Release 3 has a subsecond sleep.

S5R3 has "poll()", which can be used to get a subsecond sleep in the
same fashion "select()" is used.

>Probably in SVR4.

S5R4 has "poll()", has a "select()" implemented atop "poll()", and also
has "usleep()" in the BSD compatibility library, presumably implemented
atop "setitimer()" and SIGALRM just as the 4.3BSD version is.