text: /**************************************************************************/
  /*                                                                        */
  /*       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                                                        */
  /**                                                                       */
  /**   Internet Protocol (IP)                                              */
  /**                                                                       */
  /**************************************************************************/
  /**************************************************************************/
  
  #define NX_SOURCE_CODE
  
  
  /* Include necessary system files.  */
  
  #include "nx_api.h"
  #include "nx_ip.h"
  
  
  /**************************************************************************/
  /*                                                                        */
  /*  FUNCTION                                               RELEASE        */
  /*                                                                        */
  /*    _nx_ip_packet_deferred_receive                      PORTABLE C      */
  /*                                                           6.1          */
  /*  AUTHOR                                                                */
  /*                                                                        */
  /*    Yuxin Zhou, Microsoft Corporation                                   */
  /*                                                                        */
  /*  DESCRIPTION                                                           */
  /*                                                                        */
  /*    This function receives a packet from the link driver (usually the   */
  /*    link driver's input ISR) and places it in the deferred receive      */
  /*    packet queue.  This moves the minimal receive packet processing     */
  /*    from the ISR to the IP helper thread.                               */
  /*                                                                        */
  /*  INPUT                                                                 */
  /*                                                                        */
  /*    ip_ptr                                Pointer to IP control block   */
  /*    packet_ptr                            Pointer to packet to send     */
  /*                                                                        */
  /*  OUTPUT                                                                */
  /*                                                                        */
  /*    None                                                                */
  /*                                                                        */
  /*  CALLS                                                                 */
  /*                                                                        */
  /*    tx_event_flags_set                    Set events for IP thread      */
  /*                                                                        */
  /*  CALLED BY                                                             */
  /*                                                                        */
  /*    Application I/O Driver                                              */
  /*                                                                        */
  /*  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_ip_packet_deferred_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
  {
  
  TX_INTERRUPT_SAVE_AREA
  
  
      /* Disable interrupts.  */
      TX_DISABLE
  
      /* Add debug information. */
      NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
  
      /* Check to see if the deferred processing queue is empty.  */
      if (ip_ptr -> nx_ip_deferred_received_packet_head)
      {
  
          /* Not empty, just place the packet at the end of the queue.  */
          (ip_ptr -> nx_ip_deferred_received_packet_tail) -> nx_packet_queue_next =  packet_ptr;
          packet_ptr -> nx_packet_queue_next =  NX_NULL;
          ip_ptr -> nx_ip_deferred_received_packet_tail =  packet_ptr;
  
          /* Restore interrupts.  */
          TX_RESTORE
      }
      else
      {
  
          /* Empty deferred receive processing queue.  Just setup the head pointers and
             set the event flags to ensure the IP helper thread looks at the deferred processing
             queue.  */
          ip_ptr -> nx_ip_deferred_received_packet_head =  packet_ptr;
          ip_ptr -> nx_ip_deferred_received_packet_tail =  packet_ptr;
          packet_ptr -> nx_packet_queue_next =             NX_NULL;
  
          /* Restore interrupts.  */
          TX_RESTORE
  
          /* Wakeup IP helper thread to process the IP deferred receive.  */
          tx_event_flags_set(&(ip_ptr -> nx_ip_events), NX_IP_RECEIVE_EVENT, TX_OR);
      }
  }
  
  