Hi!
I'm using Xenomai 2.4.2 with Linux 2.6.20.21 (Adeos-ipipe 1.8-03) on
ARM9 (AT91SAM9260 based). I have a problem with using shared memory
between kernel and user space. I've tried on user space side both
native and posix skins.
Here are snippets:
--- rt_shm.c - kernel module ---
RT_TASK rt_shm_task;
RT_HEAP heap_desc;
void *shared_mem;
[..]
if (!rt_heap_create (&heap_desc, "MainSHM", 1024, H_SHARED)) {
printk ("Error rt_heap_create");
}
if (!rt_heap_alloc (&heap_desc, 0, TM_NONBLOCK, &shared_mem)) {
printk ("Error rt_heap_alloc");
}
[..]
============================
--- user.c - userspace app ---
RT_HEAP heap_desc;
void *shared_mem;
[..]
err = rt_heap_bind (&heap_desc, "MainSHM", TM_NONBLOCK);
if (err) {
printf ("rt_heap_bind error: %d!\n", err);
return 0;
}
rt_heap_alloc (&heap_desc, 0, TM_NONBLOCK, &shared_mem);
[..]
============================
I load rt_shm.ko, I can see it running, no errors returned during
rt_heap_* calls (I'm incrementing counter inside shared heap memory,
and displaying every 10000th time). When I start user space
application I get:
rt_heap_bind error: -11!
So, rt_heap_bind is returning -EWOULDBLOCK. Why?
Also, I've enable during kernel compilation in posix skin option
'shared memory'. Also, I tried with posix skin in user space:
[..]
fd = shm_open ("MainSHM", O_RDWR, 0);
[..]
When I start it, on the console I can see:
shm_open: No such file or directory
Xenomai: POSIX: destroyed thread c4802400
Any ideas?
Thanks!
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