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 > > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ > -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] -- For more information on Real-Time Linux see: http://www.rtlinux.org/
