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Re: detecting use of modern memory manager?
- To: firstname.lastname@example.org
- Subject: Re: detecting use of modern memory manager?
- From: email@example.com (John W. Baxter)
- Date: Tue, 6 Dec 1994 15:24:58 -0800
- Cc: firstname.lastname@example.org
- Sender: email@example.com
>Is there any programatic way of detecting whether the modern memory manager
>is turned on? Although our programmers know to turn it off for MCL some of
>our saved applications find their way to other users who don't know of
>this. I checked gestalt and didn't see anything obvious.
There is an ugly and undocumented (so far as I know) way, which I worked
out using MacsBug (which gives a "hint" by renaming the field in the Zone
header in which the flag is found). Here it is in C, taken from the source
code for a Frontier UCMD (code resource) which has reliably reported
whether or not MMM is on on both my 8100 (sometimes yes, sometimes no,
always right) and IIci (always no):
myZone = GetZone ();
// Here be dragons
// If MacsBug macros are to be believed, first byte of maxNRel has become
// heap type.
// By observation, flag is 3 if modern memory manager is on, 1 if it is off
isModern = 0 != ((*myZone).maxNRel & 0x0200);
[GetZone () is known to be sensible in the environement in which this code
can be called.]
firstname.lastname@example.org (John W. Baxter) Port Ludlow, WA