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To: cygwin-developers AT cygwin DOT com
Subject: Re: fcntl(f, F_SETLK, &fl) problem on Cygwin 1.1.8(0.34/3/2)
References: <200103030113 DOT CAA24952 AT fokus DOT gmd DOT de>
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From: Kazuhiro Fujieda <fujieda AT jaist DOT ac DOT jp>
Date: 05 Mar 2001 12:19:36 +0900
In-Reply-To: Joerg Schilling's message of Sat, 3 Mar 2001 02:13:42 +0100 (MET)
Message-ID: <s1spufwx5pz.fsf@jaist.ac.jp>
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>>> 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.
____
  | AIST      Kazuhiro Fujieda <fujieda AT jaist DOT ac DOT jp>
  | HOKURIKU  School of Information Science
o_/ 1990      Japan Advanced Institute of Science and Technology