Replace ThreadWorker with scgi::ThreadScgi.

src/scgi/thread_scgi.h

@@ -0,0 +1,57 @@
+#ifndef RTORRENT_SCGI_THREAD_SCGI_H
+#define RTORRENT_SCGI_THREAD_SCGI_H
+
+#include <atomic>
+#include <string>
+#include <torrent/utils/thread.h>
+
+namespace rpc {
+class SCgi;
+}
+
+namespace scgi {
+
+class ThreadScgiInternal;
+
+class ThreadScgi : public torrent::utils::Thread {
+public:
+
+  static void         create_thread();
+  static void         destroy_thread();
+  static ThreadScgi*  thread_scgi();
+
+  const char*         name() const override      { return "rtorrent-scgi"; }
+
+  void                init_thread() override;
+  void                cleanup_thread() override;
+
+  rpc::SCgi*          scgi();
+  bool                set_scgi(rpc::SCgi* scgi);
+
+  void                set_rpc_log(const std::string& filename);
+
+protected:
+  friend class ThreadScgiInternal;
+
+  ThreadScgi() = default;
+
+  static auto         internal_thread_scgi() { return m_thread_scgi; }
+
+  void                      call_events() override;
+  std::chrono::microseconds next_timeout() override;
+
+private:
+  void                task_touch_log();
+  void                change_rpc_log();
+
+  static ThreadScgi*  m_thread_scgi;
+
+  std::atomic<rpc::SCgi*>   m_scgi{nullptr};
+  std::string               m_rpc_log_filename;
+
+  // std::unique_ptr<ScgiManager> m_manager;
+};
+
+} // namespace scgi
+
+#endif // RTORRENT_SCGI_THREAD_SCGI_H