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 /** Packet Pool Management (Packet) */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define NX_SOURCE_CODE
24
25
26 /* Include necessary system files. */
27
28 #include "nx_api.h"
29 #include "nx_packet.h"
30 #include "tx_thread.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _nx_packet_pool_delete PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Yuxin Zhou, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function deletes a previously created packet pool. */
46 /* */
47 /* INPUT */
48 /* */
49 /* pool_ptr Packet pool control block */
50 /* pointer */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* status Return status */
55 /* */
56 /* CALLS */
57 /* */
58 /* _tx_thread_system_resume Resume threads suspended */
59 /* _tx_thread_system_preempt_check Check for preemption */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* Application Code */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
70 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
71 /* resulting in version 6.1 */
72 /* */
73 /**************************************************************************/
_nx_packet_pool_delete(NX_PACKET_POOL * pool_ptr)74 UINT _nx_packet_pool_delete(NX_PACKET_POOL *pool_ptr)
75 {
76
77 TX_INTERRUPT_SAVE_AREA
78
79 TX_THREAD *thread_ptr; /* Working thread pointer */
80
81
82 /* Disable interrupts to remove the packet pool from the created list. */
83 TX_DISABLE
84
85 /* Decrement the number of packet pools created. */
86 _nx_packet_pool_created_count--;
87
88 /* Clear the packet pool ID to make it invalid. */
89 pool_ptr -> nx_packet_pool_id = 0;
90
91 /* See if the packet pool only one on the list. */
92 if (pool_ptr == pool_ptr -> nx_packet_pool_created_next)
93 {
94
95 /* Only created packet pool, just set the created list to NULL. */
96 _nx_packet_pool_created_ptr = NX_NULL;
97 }
98 else
99 {
100
101 /* Link-up the neighbors. */
102 (pool_ptr -> nx_packet_pool_created_next) -> nx_packet_pool_created_previous =
103 pool_ptr -> nx_packet_pool_created_previous;
104 (pool_ptr -> nx_packet_pool_created_previous) -> nx_packet_pool_created_next =
105 pool_ptr -> nx_packet_pool_created_next;
106
107 /* See if we have to update the created list head pointer. */
108 if (_nx_packet_pool_created_ptr == pool_ptr)
109 {
110
111 /* Yes, move the head pointer to the next link. */
112 _nx_packet_pool_created_ptr = pool_ptr -> nx_packet_pool_created_next;
113 }
114 }
115
116 /* Temporarily disable preemption. */
117 _tx_thread_preempt_disable++;
118
119 /* Restore interrupts. */
120 TX_RESTORE
121
122 /* Walk through the packet pool suspension list to resume any and all
123 threads suspended on this packet pool. */
124 thread_ptr = pool_ptr -> nx_packet_pool_suspension_list;
125 while (pool_ptr -> nx_packet_pool_suspended_count)
126 {
127 /* Lockout interrupts. */
128 TX_DISABLE
129
130 /* Clear the cleanup pointer, this prevents the timeout from doing
131 anything. */
132 thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
133
134 /* Temporarily disable preemption again. */
135 _tx_thread_preempt_disable++;
136
137 /* Restore interrupts. */
138 TX_RESTORE
139
140 /* Set the return status in the thread to NX_POOL_DELETED. */
141 thread_ptr -> tx_thread_suspend_status = NX_POOL_DELETED;
142
143 /* Move the thread pointer ahead. */
144 thread_ptr = thread_ptr -> tx_thread_suspended_next;
145
146 /* Resume the thread. */
147 _tx_thread_system_resume(thread_ptr -> tx_thread_suspended_previous);
148
149 /* Decrease the suspended count. */
150 pool_ptr -> nx_packet_pool_suspended_count--;
151 }
152
153 /* Disable interrupts. */
154 TX_DISABLE
155
156 /* Release previous preempt disable. */
157 _tx_thread_preempt_disable--;
158
159 /* Restore interrupts. */
160 TX_RESTORE
161
162 /* If trace is enabled, insert this event into the trace buffer. */
163 NX_TRACE_IN_LINE_INSERT(NX_TRACE_PACKET_POOL_DELETE, pool_ptr, 0, 0, 0, NX_TRACE_PACKET_EVENTS, 0, 0);
164
165 /* If trace is enabled, unregister this object. */
166 NX_TRACE_OBJECT_UNREGISTER(pool_ptr);
167
168 /* Check for preemption. */
169 _tx_thread_system_preempt_check();
170
171 /* Return NX_SUCCESS. */
172 return(NX_SUCCESS);
173 }
174
175
