Re: [avr-libc-dev] #bug 27235 issue 2

[Joerg Wunsch]

As Boyapati, Anitha wrote:

> Ok. I got it. The issue is talking about the case when all the free
> *heap* (or 'cake' as you put it) is exhausted; but has a malloc'ed &
> free'd chunk (or realloc'ed) at the end in which case the 'top
> address'(?) should be allowed to move backwards.

Yes, that's the issue here.  As the top address (__brkval) never moves
back, the free space maintained by the freelist and the "cake" above
the top address are not considered to be adjacent, so if a new request
could not be satisfied from the freelist, the entire request will be
obtained from space beyond the current top where extending the current
top would have sufficed.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)