Re: shared memory (was Re: mmap - System call in 3.0 still there ???) - Article 1672 - go-pugleaf

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Re: shared memory (was Re: mmap - System call in 3.0 still there ???)

#1672

From: Matthew Dillon
Date: Tue, 29 Sep 1992 19:16

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>In article <1992Sep28.171946.22893@svcdudes.com> moose@svcdudes.com writes:
>>In article <dillon.0oba@overload.Berkeley.CA.US> dillon@overload.Berkeley.CA.US
>(Matthew Dillon) writes:
>> In article <1992Sep19.120245.1274@gamelan> thf@zelator.in-berlin.de (Thomas
>
>If this were the case, then you would be unable to attach a process using gdb.
>If you look at vm_read and vm_write, you can see how to transfer pages at will.
>While it's not as great as 1 physical page being used by two different tasks,
>it is functionally equivelant.

    It most certainly is NOT functionaly equivalent!  It's like doing IPC
    through /dev/kmem or something.  Give me a break!

    But, as someone mentioned, it turns out you CAN share writable pages
    using the undocumented mmap() call so I'm happy.

				    -Matt

>--
>Michael Rutman 		|	moose@svcdudes.com
>Cubist 			|	makes me a NeXT programmer
>Software Ventures		|	maker of MicroPhone Pro
>#include <std.disclaimer>	|	really offensive political statement

--

    Matthew Dillon		dillon@Overload.Berkeley.CA.US
    1005 Apollo Way		uunet.uu.net!overload!dillon
    Incline Village, NV. 89451	ham: KC6LVW (no mail drop)
    USA 			Sandel-Avery Engineering (702)831-8000

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Path: arc1-ca.pugleaf.net!sparky!uunet!overload!dillon

References: <dillon.0oba@overload.Berkeley.CA.US> <1992Sep28.171946.22893@svcdudes.com>

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Path: arc1-ca.pugleaf.net!sparky!uunet!overload!dillon
From: dillon@overload.Berkeley.CA.US (Matthew Dillon)
Newsgroups: comp.sys.next.programmer
Subject: Re: shared memory (was Re: mmap - System call in 3.0 still there ???)
Distribution: world
Message-ID: <dillon.0oje@overload.Berkeley.CA.US>
References:  <dillon.0oba@overload.Berkeley.CA.US> <1992Sep28.171946.22893@svcdudes.com>
Date: 29 Sep 92 11:16:56 PST
Organization: Not an Organization
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