Date: Fri, 7 Jan 2000 10:24:34 -0800 From: "Scott Hess" <scott@avantgo.com> To: "Zhihui Zhang" <zzhang@cs.binghamton.edu>, <freebsd-questions@freebsd.org> Subject: Re: Questions about select() and O_NONBLOCK Message-ID: <04a501bf593c$72930210$1e80000a@avantgo.com> References: <Pine.GSO.3.96.1000107113601.720A-100000@sol.cs.binghamton.edu>
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Zhihui Zhang <zzhang@cs.binghamton.edu> wrote: > I hope that someone will clarify the following questions for me: > > (1) Can select() be used with regular files, like myfile.txt? > > (2) Does O_NONBLOCK or O_NDELAY work on regular files? > > Any help is appreciated. At this time, regular files are _always_ ready for I/O, and _always_ fulfill your complete request (barring other problems, such as end-of-file our out-of-space conditions). This is actually the case for all Unix implementations I'm aware of, though there are sometimes ways to work around the problem (async I/O, for instance). [I've been spending the past week working around this problem in the pthreads library - since file I/O blocks below the pthreads library, disk I/O is effectively serialized when using pthreads. I'm working on integrating rfork() threads to handle disk I/O instead, so that multiple requests can be pending at a given time.] Later, scott To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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