1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_class_instance_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a new class instance for a class container. */
/* The instance of a class is not contained in the class code to */
/* reduce the class driver complexity. Rather, each class instance is */
/* attached to class container. */
/* */
/* INPUT */
/* */
/* class Pointer to class */
/* class_instance Pointer to class instance */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_class_instance_create(UX_HOST_CLASS *host_class, VOID *class_instance)
{
VOID **current_class_instance;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_CLASS_INSTANCE_CREATE, host_class, class_instance, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* If trace is enabled, register this object. */
UX_TRACE_OBJECT_REGISTER(UX_TRACE_HOST_OBJECT_TYPE_CLASS_INSTANCE, class_instance, 0, 0, 0)
/* Start with the first class instance attached to the class container. */
current_class_instance = host_class -> ux_host_class_first_instance;
/* Check if there are any instances attached. */
if (current_class_instance == UX_NULL)
{
/* Since it is the first class, attach it to the class container. */
host_class -> ux_host_class_first_instance = class_instance;
/* Return successful completion. */
return(UX_SUCCESS);
}
/* Traverse the list of the class instances until we find the last class. */
while (*current_class_instance != UX_NULL)
{
/* Point to the next class instance. */
current_class_instance = *current_class_instance;
}
/* We have reached the last class, hook the new class to the end. This way, we preserve
the chronological order of the class instances. */
*current_class_instance = class_instance;
/* Return successful completion to caller. */
return(UX_SUCCESS);
}
|
