Shared memory on Dynix/Ptx

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#404

From: Martel Manalo
Date: Thu, 05 Nov 1992 19:02

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Shared Memory on Dynix/Ptx

I would like some information on how shared memory is implemented under PTX.
I am more familiar with the SysV 386 implementation where each region is
defined as a contiguous extent of virtual address space that can be treated
as a distinct object to be shared or protected. I heard that this is not 
the case with PTX, that the text,data and stack are mapped into one region
only . Between the text , data and stack are alignment gaps and it is in 
these gaps where shared memory gets allocated. Also what does the kernel
parameter SHMGAP stand for. A memory map of the process virtual address
would be nice. Also a list of possible references.

In case it matters, we are running Dynix/Ptx 1.3.1 on a Unisys 6000/75
(S2000/400?).

Thanks in advance.
Martel Manalo
email: martel@unislc.slc.unisys.com

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Message-ID: <1992Nov5.190218.4096@unislc.uucp>

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Newsgroups: comp.sys.sequent
Path: arc1-ca.pugleaf.net!sparky!uunet!unislc!martel
From: martel@unislc.uucp (Martel Manalo)
Subject: Shared memory on Dynix/Ptx
Message-ID: <1992Nov5.190218.4096@unislc.uucp>
Summary: How is shared memory implemented on PTX
Organization: Unisys Corporation SLC
Date: Thu, 5 Nov 1992 19:02:18 GMT
Keywords: shared memory shmgap
Lines: 21