static void _Mutex_Acquire_slow(
Mutex_Control *mutex,
Thread_Control *owner,
Thread_Control *executing,
ISR_Level level,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Context_set_thread_state(
queue_context,
STATES_WAITING_FOR_SYS_LOCK_MUTEX
);
_Thread_queue_Context_set_do_nothing_enqueue_callout( queue_context );
_Thread_queue_Context_set_deadlock_callout(
queue_context,
_Thread_queue_Deadlock_fatal
);
_Thread_queue_Context_set_ISR_level( queue_context, level );
_Thread_queue_Enqueue(
&mutex->Queue.Queue,
MUTEX_TQ_OPERATIONS,
executing,
queue_context
);
}
static void _Mutex_Release_critical(
Mutex_Control *mutex,
Thread_Control *executing,
ISR_Level level,
Thread_queue_Context *queue_context
)
{
Thread_queue_Heads *heads;
heads = mutex->Queue.Queue.heads;
mutex->Queue.Queue.owner = NULL;
_Thread_Resource_count_decrement( executing );
if ( __predict_true( heads == NULL ) ) {
_Mutex_Queue_release( mutex, level, queue_context );
} else {
_Thread_queue_Context_set_ISR_level( queue_context, level );
_Thread_queue_Surrender(
&mutex->Queue.Queue,
heads,
executing,
queue_context,
MUTEX_TQ_OPERATIONS
);
}
}
int sem_post( sem_t *_sem )
{
Sem_Control *sem;
ISR_Level level;
Thread_queue_Context queue_context;
Thread_queue_Heads *heads;
unsigned int count;
POSIX_SEMAPHORE_VALIDATE_OBJECT( _sem );
sem = _Sem_Get( &_sem->_Semaphore );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
_Sem_Queue_acquire_critical( sem, &queue_context );
heads = sem->Queue.Queue.heads;
count = sem->count;
if ( __predict_true( heads == NULL && count < SEM_VALUE_MAX ) ) {
sem->count = count + 1;
_Sem_Queue_release( sem, level, &queue_context );
return 0;
}
if ( __predict_true( heads != NULL ) ) {
const Thread_queue_Operations *operations;
Thread_Control *first;
_Thread_queue_Context_set_ISR_level( &queue_context, level );
operations = SEMAPHORE_TQ_OPERATIONS;
first = ( *operations->first )( heads );
_Thread_queue_Extract_critical(
&sem->Queue.Queue,
operations,
first,
&queue_context
);
return 0;
}
_Sem_Queue_release( sem, level, &queue_context );
rtems_set_errno_and_return_minus_one( EOVERFLOW );
}
