* libs/libc/semaphore/sem_close.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/semaphore.h>
#ifdef CONFIG_FS_NAMED_SEMAPHORES
* Public Functions
****************************************************************************/
* Name: sem_close
*
* Description:
* This function is called to indicate that the calling task is finished
* with the specified named semaphore, 'sem'. The sem_close() deallocates
* any system resources allocated by the system for this named semaphore.
*
* If the semaphore has not been removed with a call to sem_unlink(), then
* sem_close() has no effect on the named semaphore. However, when the
* named semaphore has been fully unlinked, the semaphore will vanish when
* the last task closes it.
*
* Input Parameters:
* sem - semaphore descriptor
*
* Returned Value:
* 0 (OK), or -1 (ERROR) if unsuccessful.
*
* Assumptions:
* - Care must be taken to avoid risking the deletion of a semaphore that
* another calling task has already locked.
* - sem_close must not be called for an un-named semaphore
*
****************************************************************************/
int sem_close(FAR sem_t *sem)
{
int ret;
ret = nxsem_close(sem);
if (ret < 0)
{
set_errno(-ret);
return ERROR;
}
return ret;
}
#endif