1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** NetX Component */ 17 /** */ 18 /** User Datagram Protocol (UDP) */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define NX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "nx_api.h" 29 #include "tx_thread.h" 30 #include "nx_udp.h" 31 32 33 /**************************************************************************/ 34 /* */ 35 /* FUNCTION RELEASE */ 36 /* */ 37 /* _nx_udp_receive_cleanup PORTABLE C */ 38 /* 6.1 */ 39 /* AUTHOR */ 40 /* */ 41 /* Yuxin Zhou, Microsoft Corporation */ 42 /* */ 43 /* DESCRIPTION */ 44 /* */ 45 /* This function processes UDP receive timeout and thread terminate */ 46 /* actions that require the UDP socket data structures to be cleaned */ 47 /* up. */ 48 /* */ 49 /* INPUT */ 50 /* */ 51 /* thread_ptr Pointer to suspended thread's */ 52 /* control block */ 53 /* */ 54 /* OUTPUT */ 55 /* */ 56 /* None */ 57 /* */ 58 /* CALLS */ 59 /* */ 60 /* _tx_thread_system_resume Resume thread service */ 61 /* */ 62 /* CALLED BY */ 63 /* */ 64 /* _tx_thread_timeout Thread timeout processing */ 65 /* _tx_thread_terminate Thread terminate processing */ 66 /* */ 67 /* RELEASE HISTORY */ 68 /* */ 69 /* DATE NAME DESCRIPTION */ 70 /* */ 71 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 72 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 73 /* resulting in version 6.1 */ 74 /* */ 75 /**************************************************************************/ _nx_udp_receive_cleanup(TX_THREAD * thread_ptr NX_CLEANUP_PARAMETER)76VOID _nx_udp_receive_cleanup(TX_THREAD *thread_ptr NX_CLEANUP_PARAMETER) 77 { 78 79 TX_INTERRUPT_SAVE_AREA 80 81 NX_UDP_SOCKET *socket_ptr; /* Working socket pointer */ 82 83 NX_CLEANUP_EXTENSION 84 85 /* Setup pointer to UDP socket control block. */ 86 socket_ptr = (NX_UDP_SOCKET *)thread_ptr -> tx_thread_suspend_control_block; 87 88 /* Disable interrupts to remove the suspended thread from the UDP socket. */ 89 TX_DISABLE 90 91 /* Determine if the cleanup is still required. */ 92 if ((thread_ptr -> tx_thread_suspend_cleanup) && (socket_ptr) && 93 (socket_ptr -> nx_udp_socket_id == NX_UDP_ID)) 94 { 95 96 /* Yes, we still have thread suspension! */ 97 98 /* Clear the suspension cleanup flag. */ 99 thread_ptr -> tx_thread_suspend_cleanup = TX_NULL; 100 101 /* Remove the suspended thread from the list. */ 102 103 /* See if this is the only suspended thread on the list. */ 104 if (thread_ptr == thread_ptr -> tx_thread_suspended_next) 105 { 106 107 /* Yes, the only suspended thread. */ 108 109 /* Update the head pointer. */ 110 socket_ptr -> nx_udp_socket_receive_suspension_list = NX_NULL; 111 } 112 else 113 { 114 115 /* At least one more thread is on the same suspension list. */ 116 117 /* Update the list head pointer. */ 118 socket_ptr -> nx_udp_socket_receive_suspension_list = thread_ptr -> tx_thread_suspended_next; 119 120 /* Update the links of the adjacent threads. */ 121 (thread_ptr -> tx_thread_suspended_next) -> tx_thread_suspended_previous = 122 thread_ptr -> tx_thread_suspended_previous; 123 (thread_ptr -> tx_thread_suspended_previous) -> tx_thread_suspended_next = 124 thread_ptr -> tx_thread_suspended_next; 125 } 126 127 /* Decrement the suspension count. */ 128 socket_ptr -> nx_udp_socket_receive_suspended_count--; 129 130 /* Now we need to determine if this cleanup is from a terminate, timeout, 131 or from a wait abort. */ 132 if (thread_ptr -> tx_thread_state == TX_TCP_IP) 133 { 134 135 /* Thread still suspended on the UDP socket. Setup return error status and 136 resume the thread. */ 137 138 /* Setup return status. */ 139 thread_ptr -> tx_thread_suspend_status = NX_NO_PACKET; 140 141 /* Temporarily disable preemption. */ 142 _tx_thread_preempt_disable++; 143 144 /* Restore interrupts. */ 145 TX_RESTORE 146 147 /* Resume the thread! Check for preemption even though we are executing 148 from the system timer thread right now which normally executes at the 149 highest priority. */ 150 _tx_thread_system_resume(thread_ptr); 151 152 /* Finished, just return. */ 153 return; 154 } 155 } 156 157 /* Restore interrupts. */ 158 TX_RESTORE 159 } 160 161
