[rtl] Dynamic allocation confusion

[peter lawford <plawford@hns.com>]

Hi,

	I'm confused about whether or not I can dynamically allocate memory in
my RT processes; and if I can then what am I NOT allowed to use the
memory for.  I'm currently using RTLinux 1.3.
	The RTL kernel uses kmalloc(X, GFP_KERNEL) to dynamically allocate
memory for task stacks, and I figure I'll use this too, but maybe this
call can only be made at initialization:

"- RTAI has support for dynamic thread creation, whereas in RTLinux all
the threads must be created at init_module time."
				-Steve Papacharalambous, 10/6/99

On the other hand, the man pages for RTL say

"The  parent  task can  send  a  one-integer  value  data  to  the  new
task."
				- rt_task_init man page


Indicating that threads can be created dynamically.  Then again, the IPC
code for v1.3 tells me that

"'sem' must point to a * statically allocated structure."
"'mq' must point to a * statically allocated structure."
				- rtl_ipc.c

but I want to dynamically create space for tasks, semaphores and message
queues, on an as-needed basis.  Can I do this?  Can I do it if I have a
restriction that I'll never kfree the memory until I unload the module?


Thanks in advance,
						- Peter
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