Shared memory on Dynix/Ptx

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1 total messages Started by Martel Manalo Thu, 05 Nov 1992 19:02

#404

Author: 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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