Re: QGit: Shrink used memory with custom git log format

From: Jan Hudec <bulb@ucw.cz>
Date: Nov 27, 2007, 19:19 UTC
Message-ID: <20071127191915.GB9174@efreet.light.src>
In-Reply-To: <Pine.LNX.4.64.0711271045430.27959@racer.site>

On Tue, Nov 27, 2007 at 10:48:00 +0000, Johannes Schindelin wrote:

Show 12 quoted lines

> On Mon, 26 Nov 2007, Shawn O. Pearce wrote:
> > [...]
> > Otherwise I think what you really want here is a libgit that you can
> > link into your process and that can efficiently inflate an object
> > on demand for you.  Like the work Luiz was working on this past
> > summer for GSOC.  Lots of downsides to that current tree though...
> > like die() kills the GUI...
> 
> But then, die() calls die_routine, which you can override.  And C++ has 
> this funny exception mechanism which just begs to be used here.  The only 
> thing you need to add is a way to flush all singletons like the object 
> array.

Unfortunately, exceptions won't really work. Why? Because to use exceptions, you need to have an exception-safe code. That is the code needs to free any allocated resources when it's aborted by exception. And git code is not exceptions safe. Given the lack of destructors in C, it means registering all resource allocation in some kind of pool, so they can be freed en masse in case of failure. Than you can also use longjmp for die (for C they really behave the same).

-- 
						 Jan 'Bulb' Hudec <bulb@ucw.cz>