1/*--------------------------------------------------------------------------
2Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved.
3
4Redistribution and use in source and binary forms, with or without
5modification, are permitted provided that the following conditions are met:
6    * Redistributions of source code must retain the above copyright
7      notice, this list of conditions and the following disclaimer.
8    * Redistributions in binary form must reproduce the above copyright
9      notice, this list of conditions and the following disclaimer in the
10      documentation and/or other materials provided with the distribution.
11    * Neither the name of Code Aurora nor
12      the names of its contributors may be used to endorse or promote
13      products derived from this software without specific prior written
14      permission.
15
16THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
20CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27--------------------------------------------------------------------------*/
28#include "message_queue.h"
29
30int check_if_queue_empty ( unsigned int queuetocheck, void* queuecontext )
31{
32    struct video_queue_context *ptr_q = NULL;
33    /*
34     * queuetocheck - 0 command queue
35     * queuetocheck - 1 data queue
36     */
37    if ( queuecontext == NULL || (queuetocheck > 1 ) )
38    {
39        return 1;
40    }
41    ptr_q = (struct video_queue_context *)queuecontext;
42
43    if (queuetocheck == 0)
44    {
45      if (ptr_q->read_comq == ptr_q->write_comq)
46      {
47          return 1;
48      }
49    }
50    else if (queuetocheck == 1)
51    {
52        if (ptr_q->write_dataq == ptr_q->read_dataq)
53        {
54            return 1;
55        }
56    }
57
58    return 0;
59}
60
61
62
63struct video_msgq * queue_get_cmd (void* queuecontext )
64{
65    struct video_queue_context *ptr_q = NULL;
66    struct video_msgq *pitem = NULL;
67
68    if( NULL == queuecontext )
69    {
70        printf("\n queue_get_cmd: Invalid Input parameter\n");
71        return NULL;
72    }
73
74    ptr_q = (struct video_queue_context *)queuecontext;
75
76    /* Wait on the semaphore till it is released */
77    sem_wait(&ptr_q->sem_message);
78
79    /* Lock the mutex to protect the critical section */
80    pthread_mutex_lock(&ptr_q->mutex);
81
82    if (ptr_q->read_comq != ptr_q->write_comq)
83    {
84        pitem = &ptr_q->ptr_cmdq [ptr_q->read_comq];
85        ptr_q->read_comq = (ptr_q->read_comq + 1) % \
86                            ptr_q->commandq_size;
87    }
88    else if (ptr_q->write_dataq != ptr_q->read_dataq)
89    {
90        pitem = &ptr_q->ptr_dataq [ptr_q->read_dataq];
91        ptr_q->read_dataq = (ptr_q->read_dataq + 1) % \
92                            ptr_q->dataq_size;
93    }
94
95    /* Unlock the mutex to release the critical section */
96    pthread_mutex_unlock(&ptr_q->mutex);
97
98    return pitem;
99}
100
101
102int queue_post_cmdq ( void* queuecontext,
103                     struct video_msgq *pitem
104                     )
105{
106    struct video_queue_context *ptr_q = NULL;
107
108    if (pitem == NULL || queuecontext == NULL)
109    {
110        return -1;
111    }
112    ptr_q = (struct video_queue_context *)queuecontext;
113
114    /* Lock the mutex to protect the critical section */
115    pthread_mutex_lock(&ptr_q->mutex);
116
117    if ((ptr_q->write_comq + 1) % ptr_q->commandq_size == ptr_q->read_comq)
118    {
119        printf("\n QUEUE is FULL");
120        /* Unlock the mutex to release the critical section */
121        pthread_mutex_unlock(&ptr_q->mutex);
122        return 0;
123    }
124    else
125    {
126        /* Store the command in the Message Queue & increment write offset */
127        memcpy ( &ptr_q->ptr_cmdq [ptr_q->write_comq],pitem, \
128                 sizeof (struct video_msgq));
129        ptr_q->write_comq = (ptr_q->write_comq + 1) % ptr_q->commandq_size;
130    }
131
132    /* Unlock the mutex to release the critical section */
133    pthread_mutex_unlock(&ptr_q->mutex);
134
135    /* Post the semaphore */
136    sem_post(&ptr_q->sem_message);
137    return 1;
138}
139
140
141int queue_post_dataq ( void *queuecontext,
142                       struct video_msgq *pitem
143                      )
144{
145    struct video_queue_context *ptr_q = NULL;
146
147    if (pitem == NULL || queuecontext == NULL)
148    {
149        return -1;
150    }
151    ptr_q = (struct video_queue_context *)queuecontext;
152
153    /* Lock the mutex to protect the critical section */
154    pthread_mutex_lock(&ptr_q->mutex);
155
156    if ((ptr_q->write_dataq + 1) % ptr_q->dataq_size == ptr_q->read_dataq)
157    {
158        printf("\n QUEUE is FULL");
159        /* Unlock the mutex to release the critical section */
160        pthread_mutex_unlock(&ptr_q->mutex);
161        return 0;
162    }
163    else
164    {
165        /* Store the command in the Message Queue & increment write offset */
166        memcpy ( &ptr_q->ptr_dataq [ptr_q->write_dataq],pitem, \
167                 sizeof (struct video_msgq));
168        ptr_q->write_dataq = (ptr_q->write_dataq + 1) % ptr_q->dataq_size;
169    }
170
171    /* Unlock the mutex to release the critical section */
172    pthread_mutex_unlock(&ptr_q->mutex);
173
174    /* Post the semaphore */
175    sem_post(&ptr_q->sem_message);
176    return 1;
177
178}
179