src/server/sensor_event_queue.h

   1 /*
   2  * libsensord-share
   3  *
   4  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  * http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  */
  19
  20 #ifndef _SENSOR_EVENT_QUEUE_H_
  21 #define _SENSOR_EVENT_QUEUE_H_
  22
  23 #include <cstring>
  24 #include <utility>
  25 #include <queue>
  26 #include <mutex>
  27 #include <condition_variable>
  28 #include <set>
  29 #include <sensor_common.h>
  30
  31 extern std::set<unsigned int> priority_list;
  32
  33 class sensor_event_queue {
  34 private:
  35         static const unsigned int QUEUE_FULL_SIZE = 1000;
  36
  37         class compare {
  38         public:
  39                 bool operator() (void *&v1, void *&v2) {
  40                         sensor_event_t *e1 = (sensor_event_t *)v1;
  41                         sensor_event_t *e2 = (sensor_event_t *)v2;
  42                         bool prioritize_e1 = true;
  43                         bool prioritize_e2 = true;
  44
  45                         if (priority_list.empty())
  46                                 return (e2->data->timestamp < e1->data->timestamp);
  47
  48                         std::set<unsigned int>::iterator iter_e1 = priority_list.find(e1->event_type);
  49                         std::set<unsigned int>::iterator iter_e2 = priority_list.find(e2->event_type);
  50
  51                         if (iter_e1 == priority_list.end())
  52                                 prioritize_e1 = false;
  53
  54                         if (iter_e2 == priority_list.end())
  55                                 prioritize_e2 = false;
  56
  57                         if (prioritize_e2) {
  58                                 if (!prioritize_e1)
  59                                         return true;
  60                                 else {
  61                                         if (e2->data->timestamp <= e1->data->timestamp)
  62                                                 return true;
  63                                         return false;
  64                                 }
  65                         }
  66                         else {
  67                                 if (prioritize_e1)
  68                                         return false;
  69                                 else if (e2->data->timestamp <= e1->data->timestamp)
  70                                         return true;
  71                                 else
  72                                         return false;
  73                         }
  74                 }
  75         };
  76
  77         std::priority_queue<void *, std::vector<void *>, compare> m_queue;
  78
  79         std::mutex m_mutex;
  80         std::condition_variable m_cond_var;
  81
  82         typedef std::lock_guard<std::mutex> lock;
  83         typedef std::unique_lock<std::mutex> ulock;
  84
  85         sensor_event_queue() {};
  86         ~sensor_event_queue() {};
  87         sensor_event_queue(const sensor_event_queue &) {};
  88         sensor_event_queue& operator=(const sensor_event_queue &);
  89         void push_internal(void *event);
  90 public:
  91         static sensor_event_queue& get_instance();
  92
  93         void push(sensor_event_t *event);
  94         void* pop(void);
  95 };
  96
  97 #endif /* _SENSOR_EVENT_QUEUE_H_*/