1 /*
2 Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are
6 met:
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above
10 copyright notice, this list of conditions and the following
11 disclaimer in the documentation and/or other materials provided
12 with the distribution.
13 * Neither the name of The Linux Foundation nor the names of its
14 contributors may be used to endorse or promote products derived
15 from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 /*!
30 @file
31 IPACM_CmdQueue.cpp
32
33 @brief
34 This file implements the IPAM Comment Queue functionality
35
36 @Author
37 Sunil
38
39 */
40 #include <string.h>
41 #include "IPACM_CmdQueue.h"
42 #include "IPACM_Log.h"
43 #include "IPACM_Iface.h"
44
45 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
46 pthread_cond_t cond_var = PTHREAD_COND_INITIALIZER;
47
48 MessageQueue* MessageQueue::inst_internal = NULL;
49 MessageQueue* MessageQueue::inst_external = NULL;
50
getInstanceInternal()51 MessageQueue* MessageQueue::getInstanceInternal()
52 {
53 if(inst_internal == NULL)
54 {
55 inst_internal = new MessageQueue();
56 if(inst_internal == NULL)
57 {
58 IPACMERR("unable to create internal Message Queue instance\n");
59 return NULL;
60 }
61 }
62
63 return inst_internal;
64 }
65
getInstanceExternal()66 MessageQueue* MessageQueue::getInstanceExternal()
67 {
68 if(inst_external == NULL)
69 {
70 inst_external = new MessageQueue();
71 if(inst_external == NULL)
72 {
73 IPACMERR("unable to create external Message Queue instance\n");
74 return NULL;
75 }
76 }
77
78 return inst_external;
79 }
80
enqueue(Message * item)81 void MessageQueue::enqueue(Message *item)
82 {
83 if(!Head)
84 {
85 Tail = item;
86 Head = item;
87 }
88 else
89 {
90 if(Tail == NULL)
91 {
92 IPACMDBG("Tail is null\n");
93 Head->setnext(item);
94 }
95 else
96 {
97 Tail->setnext(item);
98 }
99 Tail = item;
100 }
101 }
102
103
dequeue(void)104 Message* MessageQueue::dequeue(void)
105 {
106 if(Head == NULL)
107 {
108 return NULL;
109 }
110 else
111 {
112 Message *tmp = Head;
113 Head = Head->getnext();
114
115 return tmp;
116 }
117 }
118
119
Process(void * param)120 void* MessageQueue::Process(void *param)
121 {
122 MessageQueue *MsgQueueInternal = NULL;
123 MessageQueue *MsgQueueExternal = NULL;
124 Message *item = NULL;
125 param = NULL;
126 const char *eventName = NULL;
127
128 IPACMDBG("MessageQueue::Process()\n");
129
130 MsgQueueInternal = MessageQueue::getInstanceInternal();
131 if(MsgQueueInternal == NULL)
132 {
133 IPACMERR("unable to start internal cmd queue process\n");
134 return NULL;
135 }
136
137 MsgQueueExternal = MessageQueue::getInstanceExternal();
138 if(MsgQueueExternal == NULL)
139 {
140 IPACMERR("unable to start external cmd queue process\n");
141 return NULL;
142 }
143
144 while(1)
145 {
146 if(pthread_mutex_lock(&mutex) != 0)
147 {
148 IPACMERR("unable to lock the mutex\n");
149 return NULL;
150 }
151
152 item = MsgQueueInternal->dequeue();
153 if(item == NULL)
154 {
155 item = MsgQueueExternal->dequeue();
156 if(item)
157 {
158 IPACMDBG("Get event %s from external queue.\n",
159 IPACM_Iface::ipacmcfg->getEventName(item->evt.data.event));
160 }
161 }
162 else
163 {
164 eventName = IPACM_Iface::ipacmcfg->getEventName(item->evt.data.event);
165 if (eventName != NULL)
166 {
167 IPACMDBG("Get event %s from internal queue.\n",
168 eventName);
169 }
170 }
171
172 if(item == NULL)
173 {
174 IPACMDBG("Waiting for Message\n");
175
176 if(pthread_cond_wait(&cond_var, &mutex) != 0)
177 {
178 IPACMERR("unable to lock the mutex\n");
179
180 if(pthread_mutex_unlock(&mutex) != 0)
181 {
182 IPACMERR("unable to unlock the mutex\n");
183 return NULL;
184 }
185
186 return NULL;
187 }
188
189 if(pthread_mutex_unlock(&mutex) != 0)
190 {
191 IPACMERR("unable to unlock the mutex\n");
192 return NULL;
193 }
194
195 }
196 else
197 {
198 if(pthread_mutex_unlock(&mutex) != 0)
199 {
200 IPACMERR("unable to unlock the mutex\n");
201 return NULL;
202 }
203
204 IPACMDBG("Processing item %pK event ID: %d\n",item,item->evt.data.event);
205 item->evt.callback_ptr(&item->evt.data);
206 delete item;
207 item = NULL;
208 }
209
210 } /* Go forever until a termination indication is received */
211
212 }
213