fix(mdns): Refactor freertos linux compat layers

Move it to a separate component that could be shared by multiple network
libs.

common_components/linux_compat/freertos/osal/queue.cpp

@@ -0,0 +1,79 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <cstdint>
+#include <vector>
+#include <cstring>
+#include <queue>
+#include <mutex>
+#include <condition_variable>
+#include <atomic>
+#include "osal_api.h"
+
+template <class T>
+class Queue {
+public:
+    Queue(): q(), m(), c() {}
+    ~Queue() {}
+
+    void send(std::unique_ptr<T> t)
+    {
+        std::lock_guard<std::mutex> lock(m);
+        q.push(std::move(t));
+        c.notify_one();
+    }
+
+    std::unique_ptr<T> receive(uint32_t ms)
+    {
+        std::unique_lock<std::mutex> lock(m);
+        while (q.empty()) {
+            if (c.wait_for(lock, std::chrono::milliseconds(ms)) == std::cv_status::timeout) {
+                return nullptr;
+            }
+        }
+        std::unique_ptr<T> val = std::move(q.front());
+        q.pop();
+        return val;
+    }
+
+private:
+    std::queue<std::unique_ptr<T>> q;
+    mutable std::mutex m;
+    std::condition_variable c;
+};
+
+void *osal_queue_create(void)
+{
+    auto *q = new Queue<std::vector<uint8_t>>();
+    return q;
+}
+
+void osal_queue_delete(void *q)
+{
+    auto *queue = static_cast<Queue<std::vector<uint8_t>> *>(q);
+    delete (queue);
+}
+
+bool osal_queue_send(void *q, uint8_t *data, size_t len)
+{
+    auto v = std::make_unique<std::vector<uint8_t>>(len);
+    v->assign(data, data + len);
+    auto queue = static_cast<Queue<std::vector<uint8_t>> *>(q);
+    queue->send(std::move(v));
+    return true;
+}
+
+
+bool osal_queue_recv(void *q, uint8_t *data, size_t len, uint32_t ms)
+{
+    auto queue = static_cast<Queue<std::vector<uint8_t>> *>(q);
+    auto v = queue->receive(ms);
+    if (v == nullptr) {
+        return false;
+    }
+    memcpy(data, (void *)v->data(), len);
+    return true;
+}