[avr-libc-dev] [patch #6895] Improved malloc behaviour when expanding used area

[Stefan Ernst]

URL:
  <http://savannah.nongnu.org/patch/?6895>

                 Summary: Improved malloc behaviour when expanding used area
                 Project: AVR C Runtime Library
            Submitted by: sternst
            Submitted on: Do 13 Aug 2009 13:07:25 GMT
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

This is a patch as a suggestion related to topic #1 in bug report #27235
<https://savannah.nongnu.org/bugs/?27235>

Situation:

  a = malloc(10);
  b = malloc(10);
  free(b);
Now there is a free chunk at the end of the used area of the heap.
  b = malloc(20);
The new request can not be satisfied by any free chunk, therefore the used
area needs to be expanded.

Current code:

The request is satisfied completely with fresh new memory from the expansion.
Result: there is a free chunk between a and b, and the used area is bigger
than necessary.

Patch:

The free chunk at the end of the used area is delivered to the request and
the expansion is made only for the remaining part.



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File Attachments:


-------------------------------------------------------
Date: Do 13 Aug 2009 13:07:25 GMT  Name: malloc.diff  Size: 859B   By:
sternst

<http://savannah.nongnu.org/patch/download.php?file_id=18567>

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