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Re: Locking files for CLASH_DETECTION now supported on MS-Windows
From: |
Daniel Colascione |
Subject: |
Re: Locking files for CLASH_DETECTION now supported on MS-Windows |
Date: |
Mon, 25 Feb 2013 20:28:35 -0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 |
On 2/25/2013 8:02 PM, Eli Zaretskii wrote:
>> Date: Mon, 25 Feb 2013 18:03:13 -0800
>> From: Paul Eggert <address@hidden>
>> CC: address@hidden
>>
>> One other thought. Part of the reason GNU/POSIXish hosts use
>> symbolic links is that readlink, symlink and unlink
>> are atomic operations. They let Emacs atomically create
>> a lock, test whether a lock exists, and remove a lock. This
>> doesn't seem to be true of the new MS-Windows implementation,
>> which uses open+write+close to create a lock and open+read+close
>> to test whether a lock exists, neither of which is atomic.
>> Is there some way this can be done atomically on MS-Windows?
>
> Why is that important? On Windows, as long as a file is open, no
> other application can write to it or remove the file. Is that the
> "atomic" nature you wanted?
>
>> Are readlink, symlink, and unlink atomic on MS-Windows?
>
> Please define "atomic" for these cases, and I will think about that.
If we really need atomicity under Windows, Transactional NTFS will work for more
users than symbolic links will.
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- Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Daniel Colascione, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows,
Daniel Colascione <=
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/25
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Paul Eggert, 2013/02/26
- Re: Locking files for CLASH_DETECTION now supported on MS-Windows, Eli Zaretskii, 2013/02/26