feat(esp_event): add esp_event components from esp-idf

Commit ID: 463a9d8b

components/esp_event/esp_event_private.c

@@ -0,0 +1,68 @@
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp_event_private.h"
+#include "esp_event_internal.h"
+
+#include "esp_log.h"
+
+bool esp_event_is_handler_registered(esp_event_loop_handle_t event_loop, esp_event_base_t event_base, int32_t event_id, esp_event_handler_t event_handler)
+{
+    esp_event_loop_instance_t* loop = (esp_event_loop_instance_t*) event_loop;
+
+    bool result = false;
+
+    esp_event_loop_node_t* loop_node;
+    esp_event_base_node_t* base_node;
+    esp_event_id_node_t* id_node;
+    esp_event_handler_instance_t* handler;
+
+    SLIST_FOREACH(loop_node, &(loop->loop_nodes), next) {
+        SLIST_FOREACH(handler, &(loop_node->handlers), next) {
+            if(event_base == ESP_EVENT_ANY_BASE && event_id == ESP_EVENT_ANY_ID && handler->handler == event_handler)
+            {
+                result = true;
+                goto out;
+            }
+        }
+
+        SLIST_FOREACH(base_node, &(loop_node->base_nodes), next) {
+            if (base_node->base == event_base) {
+                SLIST_FOREACH(handler, &(base_node->handlers), next) {
+                    if(event_id == ESP_EVENT_ANY_ID && handler->handler == event_handler)
+                    {
+                        result = true;
+                        goto out;
+                    }
+                }
+
+                SLIST_FOREACH(id_node, &(base_node->id_nodes), next) {
+                    if(id_node->id == event_id) {
+                        SLIST_FOREACH(handler, &(id_node->handlers), next) {
+                            if(handler->handler == event_handler)
+                            {
+                                result = true;
+                                goto out;
+                            }
+                        }       
+                    }
+                }
+            }
+        }
+    }
+
+out:
+    xSemaphoreGive(loop->mutex);
+    return result;
+}