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c-user/ada_support.rst: Discuss timer server and interrupt threads

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Joel Sherrill 2017-01-19 13:02:38 -06:00
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@ -90,3 +90,10 @@ to violating assumptions in the GNAT run-time. Specifically a priority
ceiling mutex should never be used from an ISR and it is difficult to
predict when the Ada compiler or run-time will use a mutex.
RTEMS has two capabilities which can assist in avoiding this problem. The
Classic API Timer Manager allows the creation of Timer Service Routines
which execute in the context of a task rather than the clock tick
Interrupt Service Routine. Similarly, there is support for Interrupt Tasks
which is a mechanism to defer the processing of the event from the
hardware interrupt level to a thread.