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Article View: comp.sys.amiga.tech
Article #3553

Re: De-Allocating Memory?

#3553
From: Karl Lehenbauer
Date: Wed, 09 May 1990 15:25
26 lines
1935 bytes
In article <29676@ut-emx.UUCP> greg@walt.cc.utexas.edu (Greg Harp) writes:
>In article <MWM.90May8115606@raven.pa.dec.com> mwm@raven.pa.dec.com (Mike (Real Amigas have keyboard garages) Meyer) writes:
>>Lattice's memory routines allocate a growing pool. Doing a free()
>>doesn't release the memory back to the OS, but puts it back in the
>>pool for reuse by the Lattice memory manager.

>Sin! Sin! Sin!  PLEASE don't tell me Manx does the same thing!! 

OK, it doesn't.  But you don't want to malloc() under Manx anyway, usually,
because it does search through a linearly linked list containing an entry for
each chunk of memory you've malloc'ed to determine whether or not the memory
you're freeing was actually allocated (eliminating a source of gurus, but
doing it silently -- it doesn't report if you tried to free something you
didn't allocate, it just ignores it), which can get quite slow if you've
called malloc a bunch of times.

Besides, the Amiga puts a finer point on memory allocation than malloc 
supports, that is, do you want chip or fast RAM, public or private
(try to use MEMF_PUBLIC where relevant in case there's a protected mode
version of AmigaDOS sometime in the future).

Disclaimer:  This is from examining the library source to 3.6.  I haven't
checked the 5.0 libsrc to see if they've changed their methods.
-- 
-- uunet!sugar!karl
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From: karl@sugar.hackercorp.com (Karl Lehenbauer)
Newsgroups: comp.sys.amiga.tech
Subject: Re: De-Allocating Memory?
Message-ID: <5678@sugar.hackercorp.com>
Date: 9 May 90 15:25:43 GMT
References: <12750@wpi.wpi.edu> <MWM.90May8115606@raven.pa.dec.com> <29676@ut-emx.UUCP>
Reply-To: karl@sugar.hackercorp.com (Karl Lehenbauer)
Organization: Count Floyd's 3-D House of Unix
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