Hello Malte,
On 12/11/2018 11:28, Malte Münch wrote:
Hi,
i am implementing a new resource sharing protocol for RTEMS as part of
my bachelor thesis. The thesis is about resource sharing protocols in
realtime environments on multicore systems. Right now i have to use a
spinlock for a protocol and found a helpful implementation/function in
cpukit/include/rtems/score/smplockmcs.h. My protocol requires the
calling task to be non-preemptable and the comment for the
acquire-function requires me to disable the interrupts.
the lock API for the operating system implementation is defined in
<rtems/score/isrlock.h>. Please do not use <rtems/score/smplock*.h>
directly.
The comment in cpukit/rtems/src/taskmode.c says that it is not possible
to change either interrupt levels or the preemptability of a task in a
SMP configuration. Do you have a pointer for me on how to overcome this
issue?
You look at the wrong layer. This rtems_task_mode() is a part of the
user API. It should not be used for the operating system implementation
which deals with locking protocols.
--
Sebastian Huber, embedded brains GmbH
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