From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 08 Dec 2006 18:34:44 GMT
Subject: Re: Fast access git-rev-list output: some OS knowledge required
Message-ID: <e5bfff550612081034q5e4c0c93s3512fce2f11b1fab@mail.gmail.com>
In-Reply-To: <45781639.1050208@op5.se>

On 12/7/06, Andreas Ericsson <ae@op5.se> wrote:
> Shawn Pearce wrote:
> >
> > Perhaps there is some fast IPC API supported by Qt that you could
> > use to run the revision listing outside of the main UI process,
> > to eliminate the bottlenecks you are seeing and remove the problems
> > noted above?  One that doesn't involve reading from a pipe I mean...
> >
>
> Why not just fork() + exec() and read from the filedescriptor? You can
> up the output buffer of the forked program to something suitable, which
> means the OS will cache it for you until you copy it to a buffer in qgit
> (i.e., read from the descriptor).
>

Please, what do you mean with "something suitable"? How can I redirect
the output to a memory buffer or to a file that the OS will cache
*until* I've copied it?

If I redirect to a 'normal' file, this will be flushed by OS after
some time, normally few seconds.

Could you please post links with examples/docs about this kind of
implementation?


Thanks