75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
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/****************************************************************************
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* libs/libc/semaphore/sem_setprioceiling.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <sched.h>
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#include <nuttx/semaphore.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsem_setprioceiling
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*
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* Description:
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* Set the priority ceiling of a semaphore.
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*
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* Input Parameters:
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* mutex - The mutex in which to set the mutex priority ceiling.
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* prioceiling - The mutex priority ceiling value to set.
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* old_ceiling - Location to return the mutex ceiling priority set before.
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*
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* Return Value:
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* This is an internal OS interface and should not be used by applications.
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* It follows the NuttX internal error return policy: Zero (OK) is
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* returned on success. A negated errno value is returned on failure
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*
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****************************************************************************/
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int nxsem_setprioceiling(FAR sem_t *sem, int prioceiling,
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FAR int *old_ceiling)
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{
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DEBUGASSERT(sem != NULL);
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if ((sem->flags & SEM_PRIO_MASK) == SEM_PRIO_PROTECT &&
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prioceiling >= sched_get_priority_min(SCHED_FIFO) &&
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prioceiling <= sched_get_priority_max(SCHED_FIFO))
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{
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if (old_ceiling != NULL)
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{
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*old_ceiling = sem->ceiling;
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}
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sem->ceiling = prioceiling;
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return OK;
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}
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return -EINVAL;
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}
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