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Date: Sun, 4 Mar 2001 23:55:58 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-developers AT cygwin DOT com
Subject: Re: fcntl(f, F_SETLK, &fl) problem on Cygwin 1.1.8(0.34/3/2)
Message-ID: <20010304235558.C8103@redhat.com>
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References: <200103030113 DOT CAA24952 AT fokus DOT gmd DOT de> <s1spufwx5pz DOT fsf AT jaist DOT ac DOT jp>
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In-Reply-To: <s1spufwx5pz.fsf@jaist.ac.jp>; from fujieda@jaist.ac.jp on Mon, Mar 05, 2001 at 12:19:36PM +0900

On Mon, Mar 05, 2001 at 12:19:36PM +0900, Kazuhiro Fujieda wrote:
>>>> On Sat, 3 Mar 2001 02:13:42 +0100 (MET)
>>>> Joerg Schilling <schilling AT fokus DOT gmd DOT de> said:
>
>> VED (and similar nvi) does record locking of edited files by first
>> opening the file with O_RDWR and applying a record lock. Then it opens
>> the the file for reading and reads the file into the buffer.
>> 
>> This definitely does not work with Cygwin on Win ME. 
>> 
>> -	Will this work on Win NT ?
>
>No. The locking semantics in Cygwin is completely different from
>UNIX.  A lock is acquired by a file descriptor, not by a process.
>This is the semantics of LockFile or LockFileEx invoked by the
>Cygwin DLL.
>
>> But then there should definitely a fix in cygwin or a hint in the FAQ.
>
>I think such a troublesome locking mechanism should be eliminated
>from the Cygwin DLL or should be noted by a document.

I appreciate the clarification but, as I've noted, if a change in
documentation or source code is appropriate, then I expect someone in
this mailing list to provide it.

Maybe you and Joerg can work together to provide something appropriate?

cgf