Changing task mode

[leonard.bise at syderal.ch (Leonard Bise)]

Hi all,

I have a task performing some actions, that I would like to not be done at 
the same time by another task. I know it would certainly be better to use 
semaphores but this code was not writtten by me and it would be 
complicated to change it.

To do so I chose to modify the task mode of my current task executing the 
actions that should not be done concuratively like so.

rtems_task_mode(RTEMS_NO_PREEMPT, RTEMS_PREEMPT_MASK, &previous_mode);

If I understand it correctly this new mode should keep other tasks from 
being called until I reactivate the preemption, is it correct?
So for the time where my current task is set as not preemptive I have no 
risk that the code I'm currently executing will be done by another task.

I hope someone can clarify this for me. 

Thanks in advance, L?o.
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