On Sun, 23 Jan 2000 15:48:28 -0500 Stephane Bouchard
<[EMAIL PROTECTED]> wrote:
> Hi,
Hi,
>
> I have some questions about the shared memory module of RTLinux. I use the
> RTL v.2 with the kernel 2.2.13 on a PC Pentium 200. My question are:
>
> 1- What is the maximum size of the shared memory with the module available
> with the base version of rtl 2.0? Can I find a more up-to-date version?
>
> 2- Can I use this shared memory from a interrupt routine?
>
> 3- Can I shared memory between a RTL-interrupt routine and a Linux-Process
> and follow the writing by this way:
>
> RTL interrupt routine:
> -declare a structure (and allocate the memory for) where the number of data
> acquired is record, base address, ... are stock.
> -send the address of the structure by a fifo to a linux process
> -declare a shared memory zone for record data
> -record data on shared memory and increase the index in structure
>
> Linux-process
> -declare a pointer on the address receive by the fifo
> -allocate the shared memory zone
> -Read the index of the data
> -read shared memory zone
>
> NOTE: in this example, the pointer on structure is common to the 2
> functions. Can the access is possible by the both function or memory will
> be protect?
>
> This method look as the faster to acces the shared memory zone (during
> acquisition task) with a minimum memory page swap. Can I know is someone
> have tried it?
>
> 4- What is the maximum jitter time on a Pentium 100 ? or what are the
> units of data with the measurements examples?
>
> Regards,
>
> Stephane Bouchard
This document will answer a lot of your questions :
http://www.isd.cme.nist.gov/projects/emc/shmem.html
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brand602
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