Path: utzoo!utgpu!water!watmath!clyde!rutgers!mailrus!umix!husc6!bloom-beacon!gatech!hubcap!ncrcae!ncr-sd!hp-sdd!hplabs!hpcea!hpfcdc!rml
From: rml@hpfcdc.HP.COM (Bob Lenk)
Newsgroups: comp.unix.wizards
Subject: Re: Efficiency of detecting input FD after SIGIO?
Message-ID: <5980018@hpfcdc.HP.COM>
Date: 12 Feb 88 00:32:41 GMT
References: <108@titan.SW.MCC.COM>
Organization: HP Ft. Collins, Co.
Lines: 12

> If there is more than one fd just use select().
> ...
> But if you can't resist optimizing things,
> do a (non-blocking) read of the fd you think has the data.
> If it indeed has data you avoid the overhead of the select().

If there's more than one socket, you should always do a select,
since there may be data on more than one socket.  Remember that
SIGIO signals are not queued.

		Bob Lenk
		{ihnp4, hplabs}!hpfcla!rml