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      1 /*--------------------------------------------------------------------------
      2 Copyright (c) 2010-2012, Code Aurora Forum. 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 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 
     16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18 IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     20 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     21 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 --------------------------------------------------------------------------*/
     28 #include "message_queue.h"
     29 
     30 int 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 
     63 struct 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 
    102 int 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 
    141 int 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