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
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