You CAN NOT use any normal Linux system calls from RT software.
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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