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198a6a16
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体验新版 GitCode,发现更多精彩内容 >>
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198a6a16
编写于
7月 09, 2013
作者:
B
Bernard Xiong
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差异文件
Merge pull request #121 from grissiom/device-ref-count
device: add ref_count support
上级
4f0cb887
7bcce9e8
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
29 addition
and
1 deletion
+29
-1
include/rtdef.h
include/rtdef.h
+1
-0
src/device.c
src/device.c
+28
-1
未找到文件。
include/rtdef.h
浏览文件 @
198a6a16
...
...
@@ -779,6 +779,7 @@ struct rt_device
rt_uint16_t
flag
;
/**< device flag */
rt_uint16_t
open_flag
;
/**< device open flag */
rt_uint8_t
ref_count
;
/**< reference count */
rt_uint8_t
device_id
;
/**< 0 - 255 */
/* device call back */
...
...
src/device.c
浏览文件 @
198a6a16
/*
* File : device.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 201
2
, RT-Thread Development Team
* COPYRIGHT (C) 2006 - 201
3
, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
...
...
@@ -24,6 +24,7 @@
* 2012-10-20 Bernard add device check in register function,
* provided by Rob <rdent@iinet.net.au>
* 2012-12-25 Bernard return RT_EOK if the device interface not exist.
* 2013-07-09 Grissiom add ref_count support
*/
#include <rtthread.h>
...
...
@@ -51,6 +52,7 @@ rt_err_t rt_device_register(rt_device_t dev,
rt_object_init
(
&
(
dev
->
parent
),
RT_Object_Class_Device
,
name
);
dev
->
flag
=
flags
;
dev
->
ref_count
=
0
;
return
RT_EOK
;
}
...
...
@@ -237,6 +239,11 @@ rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
return
-
RT_EBUSY
;
}
dev
->
ref_count
++
;
/* don't let bad things happen silently. If you are bitten by this assert,
* please set the ref_count to a bigger type. */
RT_ASSERT
(
dev
->
ref_count
!=
0
);
/* call device open interface */
if
(
dev
->
open
!=
RT_NULL
)
{
...
...
@@ -264,6 +271,14 @@ rt_err_t rt_device_close(rt_device_t dev)
RT_ASSERT
(
dev
!=
RT_NULL
);
if
(
dev
->
ref_count
==
0
)
return
-
RT_ERROR
;
dev
->
ref_count
--
;
if
(
dev
->
ref_count
!=
0
)
return
RT_EOK
;
/* call device close interface */
if
(
dev
->
close
!=
RT_NULL
)
{
...
...
@@ -297,6 +312,12 @@ rt_size_t rt_device_read(rt_device_t dev,
{
RT_ASSERT
(
dev
!=
RT_NULL
);
if
(
dev
->
ref_count
==
0
)
{
rt_set_errno
(
-
RT_ERROR
);
return
0
;
}
/* call device read interface */
if
(
dev
->
read
!=
RT_NULL
)
{
...
...
@@ -329,6 +350,12 @@ rt_size_t rt_device_write(rt_device_t dev,
{
RT_ASSERT
(
dev
!=
RT_NULL
);
if
(
dev
->
ref_count
==
0
)
{
rt_set_errno
(
-
RT_ERROR
);
return
0
;
}
/* call device write interface */
if
(
dev
->
write
!=
RT_NULL
)
{
...
...
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