Hi,
I am experiencing some problems with shared memory.
Since now out application runs on a PC104 Pentium Based hardware, and the
devlepment tools run on a different PC (pentium mmx).
As internela request I have been asked to have the application running on a
lower cost platform. This is why I am testing it on a 386 PC104 and an
AMD486 PC platform both equipped with 16M.
The RT task are running perfeclty but when I am trying to use and access
shared mem the module is not running. Actually it prompts an error and the
module is not inizialized and not running.
I was aware of the limit of the shared mem pool that is 1M for the non
Pentium class machine but the shared mem I am using is just 1M.
The following is the code I am trying to run.
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/cons.h>
#include <asm/io.h>
#include <rtl_sched.h>
#include "common.h"
#define BASE_ADDRESS (15 * 0x100000)
typedef struct
{
long InUseFlag;
long valueone;
} STRUCTTEST;
STRUCTTEST *sptr;
RT_TASK mytask;
RTIME interval;
long counter;
long missedaccess;
void xmainloop(int t) {
while(1)
{
counter++;
/*printk("Loop n:%ld\n", counter);*/
if (sptr->InUseFlag != 0)
{
/* the shared mem has been accesed by some other process
maybe we can increment a deferral counter so that we
can make a delay statistics */
printk ("Missed access.\n");
missedaccess++;
}
else
{
missedaccess = 0;
sptr->valueone = counter;
}
rt_task_wait();
}
}
int init_module(void)
{
RTIME now = rt_get_time();
interval = (RT_TICKS_PER_SEC/100);
sptr = (STRUCTTEST *) BASE_ADDRESS;
sptr->InUseFlag = 0;
rt_task_init(&mytask, xmainloop, 0xffff, 3000, 4);
rt_task_make_periodic(&mytask, now + 1000, interval);
return 0;
}
void cleanup_module(void)
{
rt_task_delete(&mytask);
}
I hope someone could give me some advise.
Ciao
Giovanni
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