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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Host Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_stack_class_instance_create PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function creates a new class instance for a class container. */ |
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/* The instance of a class is not contained in the class code to */ |
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/* reduce the class driver complexity. Rather, each class instance is */ |
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/* attached to class container. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* class Pointer to class */ |
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/* class_instance Pointer to class instance */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* USBX Components */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_stack_class_instance_create(UX_HOST_CLASS *host_class, VOID *class_instance) |
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{ |
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VOID **current_class_instance; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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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) |
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/* If trace is enabled, register this object. */ |
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UX_TRACE_OBJECT_REGISTER(UX_TRACE_HOST_OBJECT_TYPE_CLASS_INSTANCE, class_instance, 0, 0, 0) |
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/* Start with the first class instance attached to the class container. */ |
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current_class_instance = host_class -> ux_host_class_first_instance; |
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/* Check if there are any instances attached. */ |
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✓✓ |
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if (current_class_instance == UX_NULL) |
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{ |
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/* Since it is the first class, attach it to the class container. */ |
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host_class -> ux_host_class_first_instance = class_instance; |
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/* Return successful completion. */ |
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return(UX_SUCCESS); |
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} |
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/* Traverse the list of the class instances until we find the last class. */ |
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✓✓ |
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while (*current_class_instance != UX_NULL) |
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{ |
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/* Point to the next class instance. */ |
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current_class_instance = *current_class_instance; |
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} |
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/* We have reached the last class, hook the new class to the end. This way, we preserve |
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the chronological order of the class instances. */ |
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*current_class_instance = class_instance; |
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/* Return successful completion to caller. */ |
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return(UX_SUCCESS); |
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} |
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