URL:
<http://savannah.nongnu.org/bugs/?27235>
Summary: malloc: Several things go wrong
Project: AVR C Runtime Library
Submitted by: malte
Submitted on: Wed 12 Aug 2009 02:54:00 PM GMT
Category: Library
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: libc code
Status: None
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 1.6.6
Fixed Release: None
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Details:
Already discussed here,
http://www.mikrocontroller.net/topic/147150
it looks like there are three behaviors that could be better:
1. If malloc is called and there is only parts of the memory free, empty gaps
arise without need:
void * a = s_malloc(34);
a = s_realloc(a, 10);
void * b = s_malloc(34);
Resulting in an unnecessary empty gap between between a and b.
2. If there is RAM for the Heap, which has been allocated and freed before,
the next allocating goes from upper to lower addresses. This will IMHO be bad
for realloc calls, because the memory behind will most likely be used,
resulting in gaps if the memory size decreases and memory copies if
increased.
3. There have been cases found where malloc claims not to have any memory
free, which is wrong.
All three issues can be created with the attached sample.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Wed 12 Aug 2009 02:54:00 PM GMT Name: tests.zip Size: 17kB By:
malte
<http://savannah.nongnu.org/bugs/download.php?file_id=18562>
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