On Jun 30, 2014, at 14:41 , Joel Sherrill <joel.sherr...@oarcorp.com> wrote:
> Is your "struct handler_arguments" declared on the stack (e.g. an
> automatic variable)? If so, then the memory is likely clobbered by
> the time the ISR runs.
Not necessarily. A common method would be:
thread_to_process_something() {
struct handler_arguments on_stack;
install_isr_that_uses_on_stack();
while (work_to_do_with_isr()) {
receive_and_process_semaphore_from_isr();
}
shutdown_isr();
}
You just need to ensure that the stack isn't out of scope when the isr can fire.
You can't do this on systems that have per-thread stacks that are only mapped
when the thread is active, but I don't know of any RTEMS usage of that. I've
used multi-processor systems that have that attribute.
Peter
-----------------
Peter Dufault
HD Associates, Inc. Software and System Engineering
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