Okay. If you want to be _that_ literal, yes, you're right. But I was
thinking along the functional lines of "anything that enters the Linux
kernel is a function call", and I think that most people who read the
message understood what I was talking about. After all, I was taught,
long ago, that "the primary purpose of language is to communicate",
not to provide a living for lawyers.
Norm
----- Original Message -----
From: Calin A. Culianu <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Saturday, December 08, 2001 1:33 PM
Subject: RE: [rtl] malloc, timers, and crashes.
> On Fri, 7 Dec 2001, Dresner, Norman A. wrote:
>
> > You CAN NOT use any normal Linux system calls from RT software.
>
> I don't mean to be picky--(erm.. ok I mean to be picky) I just
want to
> clarify some teminology: Something like kmalloc, which is a function
> internal to the linux kernel is something quite different from a
system
> call. A system call has a very specific meaning, and kernel-space
> functions do not fall under that category at all.. :)
>
> -Calin
>
> >
> > If you can't pre-allocate it, you'll have to create a pool.
> >
> >
> > Norm
> >
> >
> > -----Original Message-----
> > From: Ken Emmons, Jr. [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, December 06, 2001 3:54 PM
> > To: [EMAIL PROTECTED]
> > Subject: [rtl] malloc, timers, and crashes.
> >
> >
> > Hello,
> >
> > I am trying to create a doubly linked list in order to keep track
of timers
> > on my system. It is similar to the way they do it in the Linux
kernel, but
> > obviously much faster polling for RT purposes. Certain function
calls in my
> > API will allocate memory for a structure and then call a function
to isert
> > this structure intot he list. I tried using:
> >
> > my_struct_t my_struct;
> > my_struct = kmalloc( sizeof(my_struct_t), GFP_ATOMIC);
> >
> > within a periodic RT task and it appears to crash my machine.
> >
> > Is this supposed to work in RTLinux?? If not how do I get free
memory?? Do I
> > have to set aside a free block of ram and create my own memory
allocation
> > algorithms?? Does RTLinux have a preferred mechanism?
> >
> > Thanks,
> >
> > ~Ken
> >
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>
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