Re: out-of-mem handler
- From: "Emmanuel DELOGET" <logout free fr>
- To: <gtk-devel-list redhat com>
- Subject: Re: out-of-mem handler
- Date: Mon, 14 Feb 2000 14:35:21 +0100
From: Sebastian Wilhelmi <firstname.lastname@example.org>
>> I remember that we talked about how to do an out-of-memory handler for
>> g_malloc() etc., did anyone ever do the patch? Should I make a patch?
>Just to reiterate:
>Do not add a callback for out of memory. You wouldn't be allowed to call any
>glib-function (let alone GTK) inside this handler, as that might screw up the
>internal state, depending on where the g_malloc call came from, also Xlib
>doesn't allow overloading the Xmalloc. Thus the callback wouldn't be called,
>when out of mem in X.
Sure the callback would not help when the programmer tries to allocate
a few bytes. But it should be interesting to have it when trying
to allocate large chunks of memory (in order to store a big
pixmap for example). Then allocating only a few bytes to tell
the user that a malloc failed should not hurt...
>Add a g_malloc_try (we already talked about it then). This is a really
>necessary function, but a handler will yield exactly nothing.
The g_malloc_try will lead exactly to this callback mecanism
but without any callback. When the programmer wants to use such a
functions, he does:
void *my_malloc(size_t size)
ptr = g_malloc_try(size);
if (ptr == NULL)
It's just the same as having the print_error function
called as a callback when the g_malloc failed, except
that you continue to call the g_malloc() func instead
of having another function to call when trying to alloc
a chunk of memory.
> [oups... just found the del key]
>So, please don't add an out-of-mem-callback.
>Sebastian Wilhelmi | här ovanför alla molnen
>mailto:email@example.com | är himmlen så förunderligt blå
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