On 28/09/2021 12:24, Heinz Junkes wrote:
in EPICS osdMutex the semaphore is created like this:sc = rtems_semaphore_create (rtems_build_name ('M', c3, c2, c1), 1, RTEMS_PRIORITY|RTEMS_BINARY_SEMAPHORE|RTEMS_INHERIT_PRIORITY|RTEMS_NO_PRIORITY_CEILING|RTEMS_LOCAL, 0, &sid); if (sc != RTEMS_SUCCESSFUL) { errlogPrintf ("Can't create mutex semaphore: %s\n", rtems_status_text (sc)); return NULL; } The implementation: https://github.com/epics-base/epics-base/blob/7.0/modules/libcom/src/osi/os/RTEMS-score/osdMutex.c
This is a priority inheritance mutex which must be used by threads only. Using it from within interrupt context will not work.
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