Initially Locked Priority Ceiling Semaphores

[Sebastian Huber]

On 2014-05-21 17:01, Gedare Bloom wrote:
>>    if ( initially_locked ) {
>> >     the_mutex->nest_count = 1;
>> >     the_mutex->holder     = executing;
>> >     if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
>> >          _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ) {
>> >
>> >       if ( executing->current_priority <
>> >              the_mutex->Attributes.priority_ceiling )
>> >        return CORE_MUTEX_STATUS_CEILING_VIOLATED;
> Looks like this check ensures the executing thread has got priority at
> least at the priority_ceiling. If it does not, the mutex is not
> initialized.

Yes, this is the error case.   In the good case the priority is not changed to 
the ceiling priority like for a normal rtems_semaphore_obtain() (see 
_CORE_mutex_Seize_interrupt_trylock_body()).

-- 
Sebastian Huber, embedded brains GmbH

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