Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c++ > #6394

Re: C++ File Lokcing

From Nobody <nobody@nowhere.com>
Subject Re: C++ File Lokcing
Date 2011-06-08 07:50 +0100
Message-Id <pan.2011.06.08.06.50.37.16000@nowhere.com>
Newsgroups comp.lang.c++
References (6 earlier) <islqai$qij$1@dont-email.me> <islrua$rhi$4@reader1.panix.com> <Xns9EFDEAAD3EE20myfirstnameosapriee@216.196.109.131> <library-extensions-20110607224708@ram.dialup.fu-berlin.de> <ism9p1$og8$2@reader1.panix.com>
Organization Zen Internet

Show all headers | View raw

On Tue, 07 Jun 2011 22:46:57 +0000, Ruben Safir wrote:

> I know I'm ignorant, but I would think that file locking is a universal 
> need all all OS's.  As for the low level implementation, leave it to the 
> compiler.

Some form of locking may exist on most multi-user and/or multi-tasking
OSes, but the nature of such locking may vary wildly.

Can you lock byte ranges or just the whole file? Can you lock to the end
of the file such that the range will be extended to cover appended data?
Are locks advisory (a lock only prevents further locks) or mandatory (a
lock directly prevents reading or writing)? And so on.

Some of these aspects aren't even standardised across Unix systems, let
alone other platforms.

Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

C++ File Lokcing ruben safir <ruben@mrbrklyn.com> - 2011-06-06 22:41 +0000
  Re: C++ File Lokcing "osmium" <r124c4u102@comcast.net> - 2011-06-06 19:25 -0500
    Re: C++ File Lokcing Juha Nieminen <nospam@thanks.invalid> - 2011-06-07 06:25 +0000
    Re: C++ File Lokcing Öö Tiib <ootiib@hot.ee> - 2011-06-07 00:32 -0700
    Re: C++ File Lokcing ruben safir <ruben@mrbrklyn.com> - 2011-06-07 11:54 -0400
      Re: C++ File Lokcing Victor Bazarov <v.bazarov@comcast.invalid> - 2011-06-07 11:55 -0400
        Re: C++ File Lokcing Ruben Safir <ruben@mrbrklyn.com> - 2011-06-07 18:17 +0000
          Re: C++ File Lokcing Victor Bazarov <v.bazarov@comcast.invalid> - 2011-06-07 14:23 -0400
            Re: C++ File Lokcing Ruben Safir <ruben@mrbrklyn.com> - 2011-06-07 18:50 +0000
              Re: C++ File Lokcing Victor Bazarov <v.bazarov@comcast.invalid> - 2011-06-07 15:16 -0400
              Re: C++ File Lokcing Jeff Flinn <TriumphSprint2000@hotmail.com> - 2011-06-07 15:47 -0400
              Re: C++ File Lokcing Paavo Helde <myfirstname@osa.pri.ee> - 2011-06-07 15:04 -0500
                Re: C++ File Lokcing Ruben Safir <ruben@mrbrklyn.com> - 2011-06-07 22:46 +0000
                Re: C++ File Lokcing Nobody <nobody@nowhere.com> - 2011-06-08 07:50 +0100
                Re: C++ File Lokcing Sherm Pendley <sherm.pendley@gmail.com> - 2011-06-08 20:55 -0400
                Re: C++ File Lokcing Öö Tiib <ootiib@hot.ee> - 2011-06-08 18:33 -0700
              Re: C++ File Lokcing Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-06-08 07:43 +0000
            Re: C++ File Lokcing Nobody <nobody@nowhere.com> - 2011-06-07 21:21 +0100
          Re: C++ File Lokcing Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-06-08 07:21 +0000
          Re: C++ File Lokcing Paavo Helde <myfirstname@osa.pri.ee> - 2011-06-08 16:14 -0500
            Re: C++ File Lokcing drew@furrfu.invalid (Drew Lawson) - 2011-06-08 22:19 +0000
            Re: C++ File Lokcing Nobody <nobody@nowhere.com> - 2011-06-09 02:54 +0100

csiph-web