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- Newsgroups: comp.sys.sequent
- Path: 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
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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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