75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_libfilesem.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 <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/fs/fs.h>
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#include "libc.h"
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* lib_sem_initialize
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****************************************************************************/
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void lib_sem_initialize(FAR struct file_struct *stream)
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{
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/* Initialize the LIB semaphore to one (to support one-at-a-time access
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* to private data sets.
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*/
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nxrmutex_init(&stream->fs_lock);
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}
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/****************************************************************************
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* lib_take_semaphore
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****************************************************************************/
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void lib_take_semaphore(FAR struct file_struct *stream)
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{
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nxrmutex_lock(&stream->fs_lock);
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}
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/****************************************************************************
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* lib_give_semaphore
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****************************************************************************/
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void lib_give_semaphore(FAR struct file_struct *stream)
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{
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nxrmutex_unlock(&stream->fs_lock);
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}
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#endif /* CONFIG_STDIO_DISABLE_BUFFERING */
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