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1 /*
2 Copyright (c) 2013-2016, 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 
127 	IPACMDBG("MessageQueue::Process()\n");
128 
129 	MsgQueueInternal = MessageQueue::getInstanceInternal();
130 	if(MsgQueueInternal == NULL)
131 	{
132 		IPACMERR("unable to start internal cmd queue process\n");
133 		return NULL;
134 	}
135 
136 	MsgQueueExternal = MessageQueue::getInstanceExternal();
137 	if(MsgQueueExternal == NULL)
138 	{
139 		IPACMERR("unable to start external cmd queue process\n");
140 		return NULL;
141 	}
142 
143 	while(1)
144 	{
145 		if(pthread_mutex_lock(&mutex) != 0)
146 		{
147 			IPACMERR("unable to lock the mutex\n");
148 			return NULL;
149 		}
150 
151 		item = MsgQueueInternal->dequeue();
152 		if(item == NULL)
153 		{
154 			item = MsgQueueExternal->dequeue();
155 			if(item)
156 			{
157 				IPACMDBG("Get event %s from external queue.\n",
158 					IPACM_Iface::ipacmcfg->getEventName(item->evt.data.event));
159 			}
160 		}
161 		else
162 		{
163 			IPACMDBG("Get event %s from internal queue.\n",
164 				IPACM_Iface::ipacmcfg->getEventName(item->evt.data.event));
165 		}
166 
167 		if(item == NULL)
168 		{
169 			IPACMDBG("Waiting for Message\n");
170 
171 			if(pthread_cond_wait(&cond_var, &mutex) != 0)
172 			{
173 				IPACMERR("unable to lock the mutex\n");
174 
175 				if(pthread_mutex_unlock(&mutex) != 0)
176 				{
177 					IPACMERR("unable to unlock the mutex\n");
178 					return NULL;
179 				}
180 
181 				return NULL;
182 			}
183 
184 			if(pthread_mutex_unlock(&mutex) != 0)
185 			{
186 				IPACMERR("unable to unlock the mutex\n");
187 				return NULL;
188 			}
189 
190 		}
191 		else
192 		{
193 			if(pthread_mutex_unlock(&mutex) != 0)
194 			{
195 				IPACMERR("unable to unlock the mutex\n");
196 				return NULL;
197 			}
198 
199 			IPACMDBG("Processing item %p event ID: %d\n",item,item->evt.data.event);
200 			item->evt.callback_ptr(&item->evt.data);
201 			delete item;
202 			item = NULL;
203 		}
204 
205 	} /* Go forever until a termination indication is received */
206 
207 }
208