b0797263ca
1.Reduce the default size of task_group_s(~512B each task) 2.Scale better between simple and complex application Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: Ia872137504fddcf64d89c48d6f0593d76d582710
154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/****************************************************************************
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* libs/libc/misc/lib_stream.c
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*
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* Copyright (C) 2007, 2011, 2013-2014, 2017 Gregory Nutt.
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* All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/sched.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/lib/lib.h>
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#include "libc.h"
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#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_stream_initialize
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*
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* Description:
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* This function is called when a new task is allocated. It initializes
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* the streamlist instance that is stored in the task group.
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*
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****************************************************************************/
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#ifdef CONFIG_FILE_STREAM
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void lib_stream_initialize(FAR struct task_group_s *group)
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{
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FAR struct streamlist *list;
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#ifdef CONFIG_MM_KERNEL_HEAP
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DEBUGASSERT(group && group->tg_streamlist);
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list = group->tg_streamlist;
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#else
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DEBUGASSERT(group);
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list = &group->tg_streamlist;
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#endif
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/* Initialize the list access mutex */
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_SEM_INIT(&list->sl_sem, 0, 1);
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list->sl_head = NULL;
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list->sl_tail = NULL;
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}
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#endif /* CONFIG_FILE_STREAM */
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/****************************************************************************
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* Name: lib_stream_release
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*
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* Description:
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* This function is called when a TCB is destroyed. Note that it does not
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* close the files by releasing the inode. That happens separately when
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* the file descriptor list is freed.
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*
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****************************************************************************/
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#ifdef CONFIG_FILE_STREAM
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void lib_stream_release(FAR struct task_group_s *group)
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{
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FAR struct streamlist *list;
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#ifdef CONFIG_MM_KERNEL_HEAP
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DEBUGASSERT(group && group->tg_streamlist);
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list = group->tg_streamlist;
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#else
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DEBUGASSERT(group);
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list = &group->tg_streamlist;
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#endif
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/* Destroy the semaphore and release the filelist */
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_SEM_DESTROY(&list->sl_sem);
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/* Release each stream in the list */
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list->sl_tail = NULL;
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while (list->sl_head != NULL)
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{
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FAR struct file_struct *stream = list->sl_head;
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list->sl_head = stream->fs_next;
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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/* Destroy the semaphore that protects the IO buffer */
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_SEM_DESTROY(&stream->fs_sem);
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#endif
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/* Release the stream */
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#ifdef CONFIG_BUILD_KERNEL
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/* If the exiting group is unprivileged, then it has an address
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* environment. Don't bother to release the memory in this case...
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* There is no point since the memory lies in the user heap which
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* will be destroyed anyway. But if this is a privileged group,
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* when we still have to release the memory using the kernel
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* allocator.
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*/
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if ((group->tg_flags & GROUP_FLAG_PRIVILEGED) != 0)
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#endif
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{
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group_free(group, stream);
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}
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}
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}
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#endif /* CONFIG_FILE_STREAM */
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#endif /* CONFIG_BUILD_FLAT || __KERNEL__ */
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