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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** User Datagram Protocol (UDP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "tx_thread.h"
#include "nx_udp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_udp_receive_cleanup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes UDP receive timeout and thread terminate */
/* actions that require the UDP socket data structures to be cleaned */
/* up. */
/* */
/* INPUT */
/* */
/* thread_ptr Pointer to suspended thread's */
/* control block */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_resume Resume thread service */
/* */
/* CALLED BY */
/* */
/* _tx_thread_timeout Thread timeout processing */
/* _tx_thread_terminate Thread terminate processing */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _nx_udp_receive_cleanup(TX_THREAD *thread_ptr NX_CLEANUP_PARAMETER)
{
TX_INTERRUPT_SAVE_AREA
NX_UDP_SOCKET *socket_ptr; /* Working socket pointer */
NX_CLEANUP_EXTENSION
/* Setup pointer to UDP socket control block. */
socket_ptr = (NX_UDP_SOCKET *)thread_ptr -> tx_thread_suspend_control_block;
/* Disable interrupts to remove the suspended thread from the UDP socket. */
TX_DISABLE
/* Determine if the cleanup is still required. */
if ((thread_ptr -> tx_thread_suspend_cleanup) && (socket_ptr) &&
(socket_ptr -> nx_udp_socket_id == NX_UDP_ID))
{
/* Yes, we still have thread suspension! */
/* Clear the suspension cleanup flag. */
thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
/* Remove the suspended thread from the list. */
/* See if this is the only suspended thread on the list. */
if (thread_ptr == thread_ptr -> tx_thread_suspended_next)
{
/* Yes, the only suspended thread. */
/* Update the head pointer. */
socket_ptr -> nx_udp_socket_receive_suspension_list = NX_NULL;
}
else
{
/* At least one more thread is on the same suspension list. */
/* Update the list head pointer. */
socket_ptr -> nx_udp_socket_receive_suspension_list = thread_ptr -> tx_thread_suspended_next;
/* Update the links of the adjacent threads. */
(thread_ptr -> tx_thread_suspended_next) -> tx_thread_suspended_previous =
thread_ptr -> tx_thread_suspended_previous;
(thread_ptr -> tx_thread_suspended_previous) -> tx_thread_suspended_next =
thread_ptr -> tx_thread_suspended_next;
}
/* Decrement the suspension count. */
socket_ptr -> nx_udp_socket_receive_suspended_count--;
/* Now we need to determine if this cleanup is from a terminate, timeout,
or from a wait abort. */
if (thread_ptr -> tx_thread_state == TX_TCP_IP)
{
/* Thread still suspended on the UDP socket. Setup return error status and
resume the thread. */
/* Setup return status. */
thread_ptr -> tx_thread_suspend_status = NX_NO_PACKET;
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Resume the thread! Check for preemption even though we are executing
from the system timer thread right now which normally executes at the
highest priority. */
_tx_thread_system_resume(thread_ptr);
/* Finished, just return. */
return;
}
}
/* Restore interrupts. */
TX_RESTORE
}