Sync.

src/Tone3000DownloaderImpl.hpp

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+/*
+ *   Copyright (c) 2026 Robin E. R. Davies
+ *   All rights reserved.
+
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ 
+ *   The above copyright notice and this permission notice shall be included in all
+ *   copies or substantial portions of the Software.
+ 
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *   SOFTWARE.
+ */
+
+#pragma once 
+
+#include <memory>
+#include <cstdint>
+#include "Tone3000Downloader.hpp"
+#include <thread>
+#include <mutex>
+#include <condition_variable>
+#include <vector>
+
+namespace pipedal {
+
+    class Tone3000DownloaderImpl: public Tone3000Downloader {
+    public:
+        virtual ~Tone3000DownloaderImpl();
+        
+        virtual void SetListener(Listener*listener) override;
+
+        virtual handle_t RequestDownload(
+            const std::string &path,
+            const std::string &url
+        ) override;
+
+        virtual void CancelDownload(
+            handle_t handle
+        ) override;
+
+        virtual void Close() override;
+        virtual DownloadProgress GetDownloadStatus() override;
+
+    private:
+        Listener *listener = nullptr;
+
+        void ThreadProc();
+        struct DownloadRequest {
+            std::atomic<bool> cancelled = false;
+            handle_t handle;
+            const std::string downloadPath;
+            const std::string downloadUrl;
+        };
+
+        std::atomic<bool> closed = false;
+        handle_t nextHandle = 1;
+        handle_t NextHandle();
+
+        std::vector<std::shared_ptr<DownloadRequest>> requestQueue;
+
+        DownloadProgress fgDownloadProgress;
+        void bgUpdateDownloadProgress(const DownloadProgress &progress);
+
+        std::shared_ptr<DownloadRequest> activeRequest;
+
+        std::mutex mutex;
+        std::condition_variable thread_cv;
+
+        
+        std::unique_ptr<std::jthread> thread;
+    };
+}