{"id":12842,"date":"2026-03-13T10:36:03","date_gmt":"2026-03-13T10:36:03","guid":{"rendered":"https:\/\/developer.rdkcentral.com\/documentation\/?page_id=12842"},"modified":"2026-03-13T10:43:43","modified_gmt":"2026-03-13T10:43:43","slug":"epon-manager-thread-architecture","status":"publish","type":"page","link":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_broadband_documentation\/components\/epon-manager\/epon-manager-thread-architecture\/","title":{"rendered":"EPON Manager – Thread Architecture"},"content":{"rendered":"\n

Thread Overview <\/h2>\n\n\n\n
graph TB\n    Main[Main Thread<br\/>EPON Controller<br\/>---<br\/>\u2022 Initialization<br\/>\u2022 Coordination<br\/>\u2022 Shutdown]\n    \n    RBusT[RBus Thread<br\/>---<br\/>\u2022 RBus Loop<br\/>\u2022 DML Handler<br\/>\u2022 Event Publish]\n    \n    EventT[Event Listener Thread<br\/>---<br\/>\u2022 Poll Event Queue<br\/>\u2022 Event Processing<br\/>\u2022 Notify Components]\n    \n    StatsT[Stats Poller Thread<br\/>Harvester<br\/>---<br\/>\u2022 Timer Loop<br\/>\u2022 HAL Poll<br\/>\u2022 Cache Update]\n    \n    Main -->|Creates & Manages| RBusT\n    Main -->|Creates & Manages| EventT\n    Main -->|Creates & Manages| StatsT\n    \n    RBusT -.->|Mutex Protected| Cache[(Cache)]\n    StatsT -.->|Mutex Protected| Cache\n    EventT -->|Poll| EventQ[Event Queue]\n    \n    style Main fill:#4A90E2,stroke:#2E5C8A,color:#fff,stroke-width:3px\n    style RBusT fill:#9C27B0,stroke:#6A1B9A,color:#fff\n    style EventT fill:#FF9800,stroke:#F57C00,color:#fff\n    style StatsT fill:#4CAF50,stroke:#388E3C,color:#fff\n    style Cache fill:#FFD700,stroke:#B8860B\n    style EventQ fill:#E91E63,stroke:#C2185B,color:#fff<\/pre><\/div>\n\n\n\n

 Thread Details<\/p>\n\n\n\n
1. Main Thread (EPON Controller)<\/strong><\/h3>\n\n\n\n
Purpose:<\/strong> System initialization, coordination, and shutdown management<\/p>\n\n\n\n
Responsibilities:<\/strong><\/p>\n\n\n\n
    \n
  • Initialize all subsystems<\/li>\n\n\n\n
  • Create and manage worker threads<\/li>\n\n\n\n
  • Handle signals and shutdown requests<\/li>\n\n\n\n
  • Coordinate resource cleanup<\/li>\n<\/ul>\n\n\n\n
    Lifecycle:<\/strong><\/p>\n\n\n\n
    START  INIT  CREATE_THREADS  MONITOR  SHUTDOWN  EXIT\n<\/pre>\n\n\n\n
    <\/pre>\n\n\n\n
    Key Functions:<\/strong><\/p>\n\n\n\n
      \n
    • epon_controller_init()<\/code> – Initialize subsystems<\/li>\n\n\n\n
    • epon_controller_start()<\/code> – Start all threads<\/li>\n\n\n\n
    • epon_controller_stop()<\/code> – Graceful shutdown<\/li>\n\n\n\n
    • signal_handler()<\/code> – Handle OS signals<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      2. RBus\/DBus Thread<\/h3>\n\n\n\n
      Purpose:<\/strong> Handle bus communication and TR-181 operations<\/p>\n\n\n\n
      Responsibilities:<\/strong><\/p>\n\n\n\n
        \n
      • Initialize RBus\/DBus connection<\/li>\n\n\n\n
      • Register TR-181 DML parameters<\/li>\n\n\n\n
      • Process GET\/SET requests<\/li>\n\n\n\n
      • Publish events to other components<\/li>\n\n\n\n
      • Maintain bus connection health<\/li>\n<\/ul>\n\n\n\n
        Thread Loop:<\/strong><\/p>\n\n\n\n
        while (running) {\n    wait_for_rbus_event()\n    if (request_received) {\n        process_request()\n        send_response()\n    }\n    if (event_to_publish) {\n        publish_event()\n    }\n}\n<\/pre>\n\n\n\n
         <\/pre>\n\n\n\n
        Synchronization:<\/strong><\/p>\n\n\n\n
          \n
        • Mutex for cache access<\/li>\n\n\n\n
        • Message queue for inter-thread communication<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          3. HAL Event Listener Thread<\/h3>\n\n\n\n
          Purpose:<\/strong> Process events from EPON HAL<\/p>\n\n\n\n
          Responsibilities:<\/strong><\/p>\n\n\n\n
            \n
          • Poll HAL event queue<\/li>\n\n\n\n
          • Categorize and dispatch events<\/li>\n\n\n\n
          • Update system state based on events<\/li>\n\n\n\n
          • Notify other components<\/li>\n<\/ul>\n\n\n\n
            Thread Loop:<\/strong><\/p>\n\n\n\n
            while (running) {\n    event = poll_hal_event_queue()\n    if (event) {\n        switch(event.type) {\n            case ONU_STATUS:\n                process_onu_status(event)\n                break\n            case ALARM:\n                process_alarm(event)\n                break\n        }\n    }\n    sleep(poll_interval)\n}\n<\/pre>\n\n\n\n
            Event Processing Time:<\/strong><\/p>\n\n\n\n
              \n
            • Target: < 50ms per event<\/li>\n\n\n\n
            • Maximum: < 100ms per event<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n
              4. Stats Polling Thread (Harvester)<\/strong><\/p>\n\n\n\n
              Purpose:<\/strong> Periodic statistics collection and reporting<\/p>\n\n\n\n
              Responsibilities:<\/strong><\/p>\n\n\n\n
                \n
              • Poll HAL for statistics at regular intervals<\/li>\n\n\n\n
              • Update internal cache with fresh data<\/li>\n\n\n\n
              • Report statistics to telemetry<\/li>\n\n\n\n
              • Track polling health<\/li>\n<\/ul>\n\n\n\n
                Thread Loop:<\/strong><\/p>\n\n\n\n
                while (running) {\n    wait_for_interval(15_minutes)\n    if (time_to_poll) {\n        stats = poll_hal_stats()\n        update_cache(stats)\n        report_to_telemetry(stats)\n    }\n}\n<\/pre>\n\n\n\n
                <\/pre>\n\n\n\n
                Configuration:<\/strong><\/p>\n\n\n\n
                  \n
                • Default interval: 15 minutes (900 seconds)<\/li>\n\n\n\n
                • Configurable<\/li>\n\n\n\n
                • Can be disabled if not needed<\/li>\n<\/ul>\n\n\n\n
                  \n\n\n\n
                  Thread Synchronization<\/p>\n\n\n\n
                  Synchronization Primitives<\/strong><\/p>\n\n\n\n
                  <\/pre>\n\n\n\n
                  \/\/ Mutex for cache access\npthread_mutex_t cache_mutex;\n\n\/\/ Condition variable for event notification\npthread_cond_t event_cond;\n\n\/\/ Thread-safe event queue\ntypedef struct {\n    queue_t queue;\n    pthread_mutex_t mutex;\n    pthread_cond_t cond;\n} thread_safe_queue_t;\n<\/pre>\n\n\n\n
                  Critical Sections<\/strong><\/p>\n\n\n\n
                  Resource<\/td>Protected By<\/td>Accessed By<\/td><\/tr>
                  Stats Cache<\/strong><\/td>cache_mutex<\/code><\/td>RBus Thread, Stats Poller<\/td><\/tr>
                  Event Queue<\/strong><\/td>Queue mutex<\/td>HAL (producer), Event Listener (consumer)<\/td><\/tr>
                  Configuration<\/strong><\/td>RW lock<\/td>All threads (read), RBus (write)<\/td><\/tr>
                  Logger<\/strong><\/td>Internal mutex<\/td>All threads<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                  Lock Ordering<\/strong><\/p>\n\n\n\n
                  To prevent deadlocks, locks must be acquired in this order:<\/p>\n\n\n\n
                    \n
                  1. Configuration lock (if needed)<\/li>\n\n\n\n
                  2. Cache lock (if needed)<\/li>\n\n\n\n
                  3. Queue lock (if needed)<\/li>\n<\/ol>\n\n\n\n
                    Never acquire locks in reverse order!<\/strong><\/p>\n\n\n\n
                    \n\n\n\n
                    Thread Communication<\/p>\n\n\n\n
                    Inter-Thread Communication Patterns<\/strong><\/p>\n\n\n\n

                     Message Passing<\/strong><\/p>\n\n\n\n
                      \n
                    • Event Queue<\/strong>: HAL events Event Listener<\/li>\n\n\n\n
                    • Function Calls<\/strong>: Direct calls with mutex protection<\/li>\n\n\n\n
                    • Shared Memory<\/strong>: Cache with mutex protection<\/li>\n\n\n\n
                    • Signals<\/strong>: Condition variables for thread wake-up<\/li>\n<\/ul>\n\n\n\n
                      \n\n\n\n
                      Thread Lifecycle Management<\/p>\n\n\n\n
                      Thread Creation<\/h3>\n\n\n\n
                      <\/pre>\n\n\n\n
                      \/\/ Create RBus thread\npthread_create(&rbus_tid, NULL, rbus_thread_func, &context);\n\n\/\/ Create Event Listener thread\npthread_create(&event_tid, NULL, event_listener_func, &context);\n\n\/\/ Create Stats Poller thread (optional)\nif (config.enable_stats_polling) {\n    pthread_create(&stats_tid, NULL, stats_poller_func, &context);\n}\n<\/pre>\n\n\n\n

                       Thread Shutdown<\/strong><\/p>\n\n\n\n
                       <\/pre>\n\n\n\n
                      \/\/ Signal all threads to stop\nrbus_thread_stop = true;\nevent_listener_stop = true;\nstats_poller_stop = true;\n\n\/\/ Wake threads if sleeping\npthread_cond_broadcast(&event_cond);\n\n\/\/ Wait for threads to exit\npthread_join(rbus_tid, NULL);\npthread_join(event_tid, NULL);\nif (stats_tid) {\n    pthread_join(stats_tid, NULL);\n}\n<\/pre>\n\n\n\n
                      \n\n\n\n
                      Thread Safety Considerations<\/p>\n\n\n\n
                      Safe Practices<\/strong><\/p>\n\n\n\n
                      DO:<\/strong><\/p>\n\n\n\n
                        \n
                      • Always use mutexes for shared data access<\/li>\n\n\n\n
                      • Use condition variables for thread signaling<\/li>\n\n\n\n
                      • Initialize mutexes before thread creation<\/li>\n\n\n\n
                      • Destroy mutexes after threads exit<\/li>\n\n\n\n
                      • Check return values of pthread functions<\/li>\n\n\n\n
                      • Use timeouts on blocking operations<\/li>\n<\/ul>\n\n\n\n
                        DON’T:<\/strong><\/p>\n\n\n\n
                          \n
                        • Access shared data without locks<\/li>\n\n\n\n
                        • Hold locks longer than necessary<\/li>\n\n\n\n
                        • Call blocking functions while holding locks<\/li>\n\n\n\n
                        • Create circular lock dependencies<\/li>\n\n\n\n
                        • Ignore thread errors<\/li>\n<\/ul>\n\n\n\n
                          \n\n\n\n
                          Performance Considerations<\/h2>\n\n\n\n
                          Thread Priorities<\/strong><\/p>\n\n\n\n
                          Thread<\/td>Priority<\/td>Reason<\/td><\/tr>
                          Event Listener<\/strong><\/td>High<\/td>Real-time event processing<\/td><\/tr>
                          RBus Thread<\/strong><\/td>Normal<\/td>Request-response handling<\/td><\/tr>
                          Stats Poller<\/strong><\/td>Low<\/td>Background task<\/td><\/tr>
                          Main Thread<\/strong><\/td>Normal<\/td>Coordination<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                          CPU Affinity<\/strong><\/p>\n\n\n\n
                            \n
                          • Not set by default<\/li>\n\n\n\n
                          • Can be configured for real-time systems<\/li>\n<\/ul>\n\n\n\n
                            Memory Usage<\/strong><\/p>\n\n\n\n
                            Thread<\/td>Stack Size<\/td>Heap Usage<\/td><\/tr>
                            Main<\/strong><\/td>Default (8MB)<\/td>~2MB<\/td><\/tr>
                            RBus<\/strong><\/td>Default<\/td>~1MB<\/td><\/tr>
                            Event Listener<\/strong><\/td>Default<\/td>~1MB<\/td><\/tr>
                            Stats Poller<\/strong><\/td>Default<\/td>~500KB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                            Total Memory Footprint:<\/strong> ~10-15MB<\/p>\n\n\n\n
                            \n\n\n\n
                            Error Handling<\/p>\n\n\n\n
                            Thread Crash Handling<\/strong><\/p>\n\n\n\n
                            \/\/ Register signal handlers\nsignal(SIGSEGV, thread_crash_handler);\nsignal(SIGABRT, thread_crash_handler);\n\nvoid thread_crash_handler(int sig) {\n    log_critical(\"Thread crashed with signal %d\", sig);\n    \n    \/\/ Notify watchdog\n    notify_watchdog();\n    \n    \/\/ Attempt graceful shutdown\n    epon_controller_stop();\n    \n    exit(1);\n}\n<\/pre>\n\n\n\n

                             Thread Health Monitoring<\/strong><\/p>\n\n\n\n
                              \n
                            • Watchdog timer per thread<\/li>\n\n\n\n
                            • Heartbeat mechanism<\/li>\n\n\n\n
                            • Automatic restart on hang detection<\/li>\n<\/ul>\n\n\n\n
                              \n\n\n\n
                              Deadlock Prevention<\/p>\n\n\n\n
                              Detection Strategy<\/strong><\/p>\n\n\n\n
                                \n
                              • Lock timeout mechanism (5 seconds)<\/li>\n\n\n\n
                              • Consistent lock ordering<\/li>\n\n\n\n
                              • Lock hierarchy enforcement<\/li>\n<\/ul>\n\n\n\n
                                <\/pre>\n\n\n\n
                                #define LOCK_TIMEOUT_MS 5000\n\nint safe_mutex_lock(pthread_mutex_t *mutex) {\n    struct timespec timeout;\n    clock_gettime(CLOCK_REALTIME, &timeout);\n    timeout.tv_sec += LOCK_TIMEOUT_MS \/ 1000;\n    \n    int ret = pthread_mutex_timedlock(mutex, &timeout);\n    if (ret == ETIMEDOUT) {\n        log_error(\"Mutex lock timeout - possible deadlock\");\n        return -1;\n    }\n    return ret;\n}\n<\/pre>\n\n\n\n
                                \n\n\n\n
                                Thread Debugging<\/p>\n\n\n\n
                                Debug Logging<\/strong><\/p>\n\n\n\n
                                <\/pre>\n\n\n\n
                                \/\/ Thread entry\/exit logging\n#define THREAD_ENTER() log_debug(\"[%s] Thread entered\", __FUNCTION__)\n#define THREAD_EXIT()  log_debug(\"[%s] Thread exiting\", __FUNCTION__)\n\n\/\/ Lock debugging\n#define LOCK_TRACE()   log_debug(\"[%s] Acquiring lock\", __FUNCTION__)\n#define UNLOCK_TRACE() log_debug(\"[%s] Releasing lock\", __FUNCTION__)\n<\/pre>\n\n\n\n
                                Tools<\/strong><\/p>\n\n\n\n
                                  \n
                                • gdb<\/strong>: Attach to running process, examine threads<\/li>\n\n\n\n
                                • valgrind –tool=helgrind<\/strong>: Detect race conditions<\/li>\n\n\n\n
                                • strace -f<\/strong>: Trace system calls from all threads<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                                  Thread Overview   Thread Details 1. Main Thread (EPON Controller) Purpose: System initialization, coordination, and shutdown management […]<\/p>\n","protected":false},"author":659,"featured_media":0,"parent":12819,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-12842","page","type-page","status-publish","hentry"],"yoast_head":"\nEPON Manager - Thread Architecture - RDK Documentation Portal | Documentation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_broadband_documentation\/components\/epon-manager\/epon-manager-thread-architecture\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"EPON Manager - Thread Architecture - RDK Documentation Portal | Documentation\" \/>\n<meta property=\"og:description\" content=\"Thread Overview   Thread Details 1. 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