MESSAGE
| DATE | 2011-06-07 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] (fwd) Re: C++ File Lokcing
|
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From: Victor Bazarov
Newsgroups: comp.lang.c++
Subject: Re: C++ File Lokcing
Date: Tue, 07 Jun 2011 14:23:13 -0400
Organization: A noiseless patient Spider
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Xref: panix comp.lang.c++:1086201
On 6/7/2011 2:17 PM, Ruben Safir wrote:
> On Tue, 07 Jun 2011 11:55:36 -0400, Victor Bazarov wrote:
>
>> On 6/7/2011 11:54 AM, ruben safir wrote:
>>> On 06/07/2011 02:33 AM, Stefan Ram wrote:
>>>> "osmium" writes:
>>>>> "ruben safir" wrote:
>>>>>> Is there a C++ specific means of file locking?
>>>>> No. File locking is provided by the operating system, not an ordinary
>>>>> user
>>>>> program, which is what a C++ compiler produces.
>>>>
>>>> This must be the correct answer, because Linus Torvalds also says that
>>>> a C++ compiler cannot produce an operating system!
>>>>
>>>> (The real reason is - of coures - just that the C++ standard library
>>>> does not provide this feature, but this might change in the future.)
>>>>
>>>>
>>>
>>> I have to do file locking on Linux. Do you have a recommendation?
>>
>> How about news:comp.os.linux.development.apps ?
>>
>> V
>
> But Victor, if you can't file lock with posix file locking, then there is
> almost no use of ios_base for file systems. You have to lock files on a
> multiuser OS before you write to them. Can you get the file descriptor
> from ofsream or can you feed flock()?
But Ruben, there is no such thing in C++ as "file descriptor". POSIX
and C++ are orthogonal, not part of each other. On some systems there
*may* be a way to get something from 'std::ios_base' other than what the
Standard specifies, but it's *not* specified by the Standard, and that's
why you need to *ask elsewhere*. Can you not see that?
V
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