On Saturday, December 03, 2011 5:37:01 am Filippo Sironi wrote:
> I need to access the memory both from user space and kernel space, I cannot
do that (simply) with an mmap or thread-specific storage if I recall
correctly.
You could allocate a dedicated VM object for each thread's information and
On 12/3/11 2:37 AM, Filippo Sironi wrote:
I need to access the memory both from user space and kernel space, I cannot do
that (simply) with an mmap or thread-specific storage if I recall correctly.
that's how mmap works.. if you give it pages to expose to the user,
you can still access them fro
On 12/3/11 12:42 AM, Filippo Sironi wrote:
Dear all,
I've a strange problem I cannot understand...
I implemented a piece of code within the FreeBSD 7.2 kernel that basically
allocate a per-thread memory page to store a certain amount of information that
must be read and written without crossin
In message <0011fd6a-e29d-4f67-913c-897ba1b2f...@gmail.com>, Filippo Sironi wri
tes:
>I need to access the memory both from user space and kernel space, I =
>cannot do that (simply) with an mmap or thread-specific storage if I =
>recall correctly.
Have you looked how shm_open(2) and friends are im
In message , Filippo Sironi wri
tes:
>Ok, that's what I was suspecting.
>Do you have any ideas on how to get the behavior I described in the =
>previous mail?
Why don't you just use mmap(2) ? I couldn't see anything you
couldn't do with it.
There's also support in pthread for thread specific st
In message , Filippo Sironi wri
tes:
>The problem is that when I come =
>back to user space all the threads write in memory page mapped by the =
>first thread that called the mmap leaving their memory pages untouched.
That's how cdev->mmap works, it is global rather than per-thread.
--
Poul-He
I need to access the memory both from user space and kernel space, I cannot do
that (simply) with an mmap or thread-specific storage if I recall correctly.
On 03/dic/2011, at 11.00, Poul-Henning Kamp wrote:
> In message , Filippo Sironi
> wri
> tes:
>
> Why don't you just use mmap(2) ? I coul
Ok, that's what I was suspecting.
Do you have any ideas on how to get the behavior I described in the previous
mail?
On 03/dic/2011, at 10.16, Poul-Henning Kamp wrote:
> In message , Filippo Sironi
> wri
> tes:
>
>> The problem is that when I come =
>> back to user space all the threads write
Dear all,
I've a strange problem I cannot understand...
I implemented a piece of code within the FreeBSD 7.2 kernel that basically
allocate a per-thread memory page to store a certain amount of information that
must be read and written without crossing user to kernel and kernel to user
boundari
Hello everybody, i'm implementing the mmap part of my nodegraph. At the
moment i'm actually stuck at a point where the process can't actually
access the memory allocation: this is the mmap() function:
static int
ng_counter_mmap(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
{
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