66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/****************************************************************************
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* libs/libc/semaphore/sem_getprioceiling.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 <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_getprioceiling
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*
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* Description:
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* This function attempts to get the priority ceiling of a semaphore.
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*
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* Input Parameters:
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* sem - A pointer to the semaphore whose attributes are to be
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* modified
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* prioceiling - Location to return the semaphore's priority ceiling
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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_getprioceiling(FAR const sem_t *sem, FAR int *prioceiling)
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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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{
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*prioceiling = sem->ceiling;
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return OK;
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}
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return -EINVAL;
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}
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